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Information on EC 2.4.99.18 - dolichyl-diphosphooligosaccharide-protein glycotransferase
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2.4.99.18 dolichyl-diphosphooligosaccharide-protein glycotransferaseIUBMB Comments
Occurs in eukaryotes that form a glycoprotein by the transfer of a glucosyl-mannosyl-glucosamine polysaccharide to the side-chain of an L-asparagine residue in the sequence -Asn-Xaa-Ser- or -Asn-Xaa-Thr- (Xaa not Pro) in nascent polypeptide chains. The basic oligosaccharide is the tetradecasaccharide Glc3Man9GlcNAc2 (for diagram {polysacc/Dol14}). However, smaller oligosaccharides derived from it and oligosaccharides with additional monosaccharide units attached may be involved. See ref for a review of N-glycoproteins in eukaryotes. Man3GlcNAc2 seems to be common for all of the oligosaccharides involved with the terminal N-acetylglucosamine linked to the protein L-asparagine. Occurs on the cytosolic face of the endoplasmic reticulum. The dolichol involved normally has 14-21 isoprenoid units with two trans double-bonds at the omega end, and the rest of the double-bonds in cis form.
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Word Map
- 2.4.99.18
-
n-glycosylation
-
n-linked
- glycoprotein
- glycans
-
nascent
-
lipid-linked
- campylobacter
-
sequons
- jejuni
-
asparagine-linked
-
ribophorins
- dolichol
- glc3man9glcnac2
-
dolichol-linked
- otase
-
translocon
-
cotranslational
-
preassembled
-
hetero-oligomeric
-
bloc
-
underglycosylation
-
glycoengineering
-
mannosyltransferases
-
aglbs
-
hypoglycosylation
-
single-subunit
- heptasaccharide
- lari
- man9glcnac2
-
split-ubiquitin
- pilins
-
glycoproteomics
- medicine
-
translocon-associated
- biotechnology
The expected taxonomic range for this enzyme is: Eukaryota, Archaea, Bacteria
Reaction Schemes
Synonyms
AglB, AglB-L, AlgB, asparagine N-glycosyltransferase, DGL1, dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit OST2, dolichyl-diphosphooligosaccharide-protein glycosyltransferase, dolichyldiphosphooligosaccharide-protein oligosaccharyltransferase, glycosyltransferase, dolichyldiphosphooligosaccharide-protein, glycosyltransferase, dolichylpyrophosphodiacetylchitobiose-protein, 
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SYNONYM 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
AglB
AlgB
asparagine N-glycosyltransferase
-
-
-
-
dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit OST2
-
dolichyldiphosphooligosaccharide-protein oligosaccharyltransferase
-
-
-
-
glycosyltransferase, dolichyldiphosphooligosaccharide-protein
-
-
-
-
glycosyltransferase, dolichylpyrophosphodiacetylchitobiose-protein
-
-
-
-
oligomannosyltransferase
-
-
-
-
oligosaccharide transferase
oligosaccharyl transferase
oligosaccharyltransferase
oligosaccharyltransferase complex
-
oligosaccharyltransferase, dolichyldiphosphoryloligosaccharide-protein
-
-
-
-
OST
OSTC(I)
-
multiple distinct protein complexes are detected. OSTC(I) is the major complex
OTase
PglB
STT3 protein
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
AglB
archaeal homolog to bacterial PglB and eukaryotic Stt3
oligosaccharide transferase
-
-
-
-
OST
-
-
-
-
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
dolichyl diphosphooligosaccharide + [protein]-L-asparagine = dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
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-
-
-
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
hexosyl group transfer
-
-
-
-
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PATHWAY SOURCE
PATHWAYS
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SYSTEMATIC NAME
IUBMB Comments
dolichyl-diphosphooligosaccharide:protein-L-asparagine N-beta-D-oligopolysaccharidotransferase
Occurs in eukaryotes that form a glycoprotein by the transfer of a glucosyl-mannosyl-glucosamine polysaccharide to the side-chain of an L-asparagine residue in the sequence -Asn-Xaa-Ser- or -Asn-Xaa-Thr- (Xaa not Pro) in nascent polypeptide chains. The basic oligosaccharide is the tetradecasaccharide Glc3Man9GlcNAc2 (for diagram {polysacc/Dol14}). However, smaller oligosaccharides derived from it and oligosaccharides with additional monosaccharide units attached may be involved. See ref [2] for a review of N-glycoproteins in eukaryotes. Man3GlcNAc2 seems to be common for all of the oligosaccharides involved with the terminal N-acetylglucosamine linked to the protein L-asparagine. Occurs on the cytosolic face of the endoplasmic reticulum. The dolichol involved normally has 14-21 isoprenoid units with two trans double-bonds at the omega end, and the rest of the double-bonds in cis form.
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CAS REGISTRY NUMBER
COMMENTARY
75302-32-8
-
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SUBSTRATE
PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
biantennary Man5GlcNAc2 dolichyl disphosphate + VSG221 coat glycoprotein
dolichyl disphosphate + ?
-
selective transfer of TbSTT3A to acidic to neutral regions of polypeptides, responsible for all paucimannose and complex N-glycans in Trypanosoma brucei glycoproteins
-
-
?
biantennary Man5GlcNAc2 dolichyl disphosphate + VSG221 coat glycoprotein
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
selective transfer of TbSTT3A to acidic to neutral regions of polypeptides, responsible for all paucimannose and complex N-glycans in Trypanosoma brucei glycoproteins
-
-
?
Campylobacter jejuni heptasaccharide bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
alpha-1,3-linked sugar, in vivo in Escherichia coli
-
-
?
crude lipid-linked oligosaccharide donors from Campylobacter jejuni + carboxytetramethylrhodamine-Ala-Asp-Gln-Asn-Ala-Thr-Tyr-Lys
dolichyl disphosphate + carboxytetramethylrhodamine-Ala-(oligosaccharidyl) Asp-Gln-Asp-Ala-Thr-Tyr
dolichyl diphosphooligosaccharide + asparagine-asparagine-threonine-NH2 acceptor peptide
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + carboxypeptidase Y (CPY)
dolichyl disphosphate + oligosaccharidyl-(carboxypeptidase Y)
-
free enzyme
-
-
?
dolichyl diphosphooligosaccharide + N2-acetyl-L-asparaginyl-4-benzoyl-L-phenylalanyl-L-tyrosinamide
dolichyl diphosphate + ?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + oligosaccaharidyl-L-Asn protein
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-oligosaccharide
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
dolichyl monophosphate GlcNAc-Glc-2,3-diNAcA + [protein]-L-asparagine
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man1 + Tyr-Asn-Leu-Thr-Ser-Val
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man9 + Nalpha-Ac-Asn-Tyr-Thr-NH2
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man9Glc3 + alpha-Ac-Asn-Tyr-Thr-NH2
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man9Glc3 + Nalpha-Ac-Asn-Lys(Nepsilon-p-azidobenzoyl)-Thr-NH2
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man9Glc3 + Tyr-Asn-Leu-Thr-Ser-Val
?
-
-
-
-
?
Escherichia coli group 1 K30 capsule antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
in vivo in Escherichia coli
-
-
?
Escherichia coli O16 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
alpha-1,6-linked Glc with GlcNAc, in vivo in Escherichia coli
-
-
?
Escherichia coli O2 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
rhamnose beta-1,4-linked sugar, in vivo in Escherichia coli
-
-
?
Escherichia coli O7 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
beta-1,3-linked sugar, in vivo in Escherichia coli
-
-
?
Escherichia coli O86 antigen bound to farnesyl diphosphate + pilin
farnesyl diphosphate + glycosylated pilin
-
pentasaccharide attached to other lipid carrier, in vitro, 500 mM Tris-HCl containing 1 M sucrose and 10 mM MnCl2, pH7.5, 30°C
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-DFNAT-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-DFNVT-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-DQNAT-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-DVNAS-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-DVNAT-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-DVNVT-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
GalNAc-N,N'-diacetyl-bacillosamine-PP-undecaprenyl + acetyl-EVNAT-(4-nitrophenylalanine)-NH2
?
-
-
-
-
?
Glc3Man9GlcNAc2 dolichyl diphosphate + protein L-asparagine
?
-
-
-
-
?
Glc3Man9GlcNAc2 dolichyl disphosphate + GAYNSTSV
dolichyl disphosphate + GAY-(Glc3Man9GlcNAc2)NSTSV
-
microsomes as enzyme source, STT3-1, increase in activity from 51 to 82% when the yeast SST3 expression is turned off, when yeast SST3 is active, only slight change in activity to 103%
-
-
?
Man5GlcNAc2 dolichyl diphosphate + GAYNSTSV
dolichyl diphosphate + GAY-(Man5GlcNAc2)NSTSV
-
microsomes as enzyme source, STT3-1, increase in activity from 34 to 109% when the yeast SST3 expression is turned off, when yeast SST3 is active, increase in activity to 115%
-
-
?
Man6GlcNAc2 dolichyl diphosphate + GAYNSTSV
dolichyl diphosphate + GAY-(Man6GlcNAc2)NSTSV
-
microsomes as enzyme source, STT3-1, increase in activity from 46 to 151% when the yeast SST3 expression is turned off, when yeast SST3 is active, increase in activity to 173%
-
-
?
Man9GlcNAc2 dolichyl disphosphate + GAYNSTSV
dolichyl disphosphate + GAY-(Man9GlcNAc2)NSTSV
-
microsomes as enzyme source, STT3-1, increase in activity from 54 to 172% when the yeast SST3 expression is turned off, when yeast SST3 is active, increase in activity to 202%
-
-
?
N-acetyl-D-galactosaminyl-alpha-(1->3)-N,N'-diacetyl-alpha-D-bacillosaminyl-diphospho-tritrans,heptacis-undecaprenol + KDFNVSKA
tritrans,heptacis-undecaprenyl diphosphate + Lys-Asp-Phe-N4-[N-acetyl-D-galactosaminyl-alpha-(1->3)-N,N'-diacetyl-beta-D-bacillosaminyl]-Asn-Val-Ser-Lys-Ala
-
-
-
-
?
N-acetyl-D-glucosamine + glycoprotein bound to polysaccharide cell wall
?
-
glycoproteins as substrates are P15703, O13547, P53301, P32623, P28319, P38248, P22146, Q03655, Q08193, P38616
-
-
?
pentaprenyl diphospho-N-acetyl-D-galactosamine + [protein]-L-asparagine
pentaprenyl diphosphate + [protein]-N-(N-acetyl-D-galactosaminyl)-L-asparagine
PglB can utilize shorter polyisoprenol (pentaprenol) as the lipid carrier, albeit with reduced efficiency
-
-
?
peptidoglycan bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
transfer of subunit of the peptidoglycan petapeptide, no transfer of the complete peptidoglycan is observed, in vivo in Salmonella enterica
-
-
?
Pseudomonas aeruginosa O11 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
FucNac, in vivo in Escherichia coli
-
-
?
Salmonella enterica O antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
in vivo in Escherichia coli
-
-
?
Salmonella typhimurium LT2 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
in vivo in Escherichia coli, in vivo in Salmonella enterica serovar Typhimurium LT2 strain
-
-
?
triantennary Man9GlcNAc2 dolichyl disphosphate + VSG221 coat glycoprotein
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
selective transfer of TbSTT3B to neutral to basic regions of polypeptides responsible for most or all oligomannose N-glycans in Trypanosoma brucei glycoproteins
-
-
?
undecaprenyl diphospho-N-acetyl-D-galactosamine + [protein]-L-asparagine
undecaprenyl diphosphate + [protein]-N-(N-acetyl-D-galactosaminyl)-L-asparagine
PglB is solely responsible for the oligosaccharyltransferase activity. PglB can transfer a monosaccharide, e.g. GalNAc to a peptide acceptor. PglB exhibits relaxed sugar substrate specificity
-
-
?
crude lipid-linked oligosaccharide donors from Campylobacter jejuni + carboxytetramethylrhodamine-Ala-Asp-Gln-Asn-Ala-Thr-Tyr-Lys
dolichyl disphosphate + carboxytetramethylrhodamine-Ala-(oligosaccharidyl) Asp-Gln-Asp-Ala-Thr-Tyr
37°C, 50 mM Tris-HCl, pH 7.5
-
-
?
crude lipid-linked oligosaccharide donors from Campylobacter jejuni + carboxytetramethylrhodamine-Ala-Asp-Gln-Asn-Ala-Thr-Tyr-Lys
dolichyl disphosphate + carboxytetramethylrhodamine-Ala-(oligosaccharidyl) Asp-Gln-Asp-Ala-Thr-Tyr
-
37°C, 50 mM Tris-HCl, pH 7.5
-
-
?
dolichyl diphosphate-di-N-acetylchitobiose + Tyr-Asn-Leu-Thr-Ser-Val
?
-
-
-
-
?
dolichyl diphosphate-di-N-acetylchitobiose + Tyr-Asn-Leu-Thr-Ser-Val
?
-
-
-
-
-
dolichyl diphosphochitobiose-(mannosyl)9-(glucosyl)3 + synthetic hexapeptide
?
-
-
-
-
?
dolichyl diphosphochitobiose-(mannosyl)9-(glucosyl)3 + synthetic hexapeptide
?
-
-
-
-
?
dolichyl diphosphochitobiose-(mannosyl)9-(glucosyl)3 + synthetic hexapeptide
?
-
glycosyl-donors are also dolichyl diphosphochitobiose or dolichyl diphospho-chitobiose-mannose, no substrates are dolichyl diphosphochitobiose-(mannosyl)9 or dolichyl diphospho-N-acetyl-D-glucosamine
-
-
?
dolichyl diphosphochitobiose-(mannosyl)9-(glucosyl)3 + synthetic hexapeptide
?
-
e.g. Tyr-Asn-Leu-Thr-Ser-Val
-
-
?
dolichyl diphosphooligosaccharide + N2-acetyl-L-asparaginyl-4-benzoyl-L-phenylalanyl-L-tyrosinamide
dolichyl diphosphate + ?
-
-
-
-
?
dolichyl diphosphooligosaccharide + N2-acetyl-L-asparaginyl-4-benzoyl-L-phenylalanyl-L-tyrosinamide
dolichyl diphosphate + ?
-
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
-
DQNAT is the optimal acceptor substrate. PglB is not capable of utilizing glycosyl donors such as dolichyl-pyrophosphatechitobiose
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
-
the enzyme utilizes the in vivo oligosaccharide donor Glc3Man9GlcNAc2-PP-Dol in preference to certain larger and/or smaller oligosaccharide donors
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
-
ribophorin I can regulate the delivery of precursor proteins to the oligosaccharyltransferase complex by capturing substrates and presenting them to the catalytic core
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
-
PglL is able to transfer diverse oligo- and polysaccharides
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
-
PilO activity is restricted to short oligosaccharides
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-glycosyl linkage to protein L-asparagine
-
the enzyme utilizes the in vivo oligosaccharide donor Glc3Man9GlcNAc2-PP-Dol in preference to certain larger and/or smaller oligosaccharide donors
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
reaction with oligosaccharide-lipid present in hen oviduct microsomes and Nalpha-Ac-Asn-Leu-Thr-NHCH3. Kinetic study with intact microsomal membrane
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
Asn-Xaa-Thr/Ser is a necessary and sufficient prerequisite for N-glycosylation
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
(Glc)n-(Man)x-GlcNAc2-diphosphoryldolichol as oligosaccharyl donor and tryptic peptide consisting of residues 29-59 from bovine alpha-lactalbumin as acceptor
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
Asn-Xaa-Thr/Ser is a necessary and sufficient prerequisite for N-glycosylation
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
glycosyl donor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
dolichyl-diphosphochitobiose-Man9Glc3 is the preferred glycosyl donor both in vivo and in vitro. The minimal glycosyl donor is dolichyl-diphosphochitobiose
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
catalyzes reaction between beta-amido nitrogen of Asn-residue and oligosaccharyl-diphosphodolichol
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
highly stereospecific for the conformation of the 3-carbon atom in the hydroxy amino acid. Binding of the threonine beta-methyl group by the enzyme is also specific, with serine, L-threo-beta-hydroxynorvaline and L-beta-hydroxynorleucine containing tripeptides all bound less efficiently than the threonine CH3-CH(OH) group
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
peptide acceptor specificity
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
the enzyme utilizes the in vivo oligosaccharide donor Glc3Man9GlcNAc2-PP-Dol in preference to certain larger and/or smaller oligosaccharide donors
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + glycoprotein with the oligosaccharide chain attached by N-glycosyl-linkage to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + oligosaccaharidyl-L-Asn protein
-
the enzyme utilizes the in vivo oligosaccharide donor Glc3Man9GlcNAc2-PP-Dol in preference to certain larger and/or smaller oligosaccharide donors
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + oligosaccaharidyl-L-Asn protein
-
N-glycosylation of AcrA occurs at positions N123, N147, and N274. N-glycosylation of AcrA by the eukaryotic OST in Saccharomyces cerevisiae occurs independent of the acidic residue at the -2 position
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + oligosaccaharidyl-L-Asn protein
-
preference for dolichol-diphospho-Glc3Man9GlcNAc2 is a feature that is determined by the complex and not by the catalytic subunit
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl diphosphate + oligosaccaharidyl-L-Asn protein
-
the enzyme utilizes the in vivo oligosaccharide donor Glc3Man9GlcNAc2-PP-Dol in preference to certain larger and/or smaller oligosaccharide donors
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + synthetic tripeptides
?
-
Asn-Tyr-Thr
-
-
?
dolichyl diphosphooligosaccharide + synthetic tripeptides
?
-
no substrates are Asn-Leu-Thr-derivatives containing asparagine modifications or substitution
-
-
?
dolichyl diphosphooligosaccharide + synthetic tripeptides
?
-
peptide hydrophobicity increases its acceptor activity
-
-
?
dolichyl diphosphooligosaccharide + synthetic tripeptides
?
-
Asn-Leu-Thr and its N-terminal acetyl-, benzoyl-, octanoyl- or t-butoxycarbonyl-derivatives
-
-
?
dolichyl diphosphooligosaccharide + synthetic tripeptides
?
-
Ac-Asn-Leu-Thr-NH2, Ac-Asn-Ala-Thr-NH2 and benzoyl-Asn-Leu-N-methylamide
-
-
?
dolichyl diphosphooligosaccharide + synthetic tripeptides
?
-
peptides that serve as acceptors show a secondary structural motif that involves the interaction between the asparagine side-chain carboxamide and the backbone amide of the threonine
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
despite processing distinct lipid-linked glycans in their native hosts, AglB from Haloarcula marismortui can readily replace their counterpart from Haloferax volcanii when introduced into Haloferax volcanii cells deleted of aglB
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
haloarchaeal AglB proteins display substrate promiscuity. Haloferax volcanii, Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei AglB each contain distinct glycan-charged lipid carriers. Haloferax volcanii can be functionally replaced by its haloarchaeal homologues
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
despite processing distinct lipid-linked glycans in their native hosts, AglB from Halobacterium salinarum can readily replace their counterpart from Haloferax volcanii when introduced into Haloferax volcanii cells deleted of aglB
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
haloarchaeal AglB proteins display substrate promiscuity. Haloferax volcanii, Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei AglB each contain distinct glycan-charged lipid carriers. Haloferax volcanii can be functionally replaced by its haloarchaeal homologues
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
despite processing distinct lipid-linked glycans in their native hosts, AglB from Haloferax mediterranei can readily replace their counterpart from Haloferax volcanii when introduced into Haloferax volcanii cells deleted of aglB
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
haloarchaeal AglB proteins display substrate promiscuity. Haloferax volcanii, Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei AglB each contain distinct glycan-charged lipid carriers. Haloferax volcanii can be functionally replaced by its haloarchaeal homologues
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
despite processing distinct lipid-linked glycans in their native hosts, AglB from Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei can readily replace their counterpart from Haloferax volcanii when introduced into Haloferax volcanii cells deleted of aglB
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
haloarchaeal AglB proteins display substrate promiscuity. Haloferax volcanii, Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei AglB each contain distinct glycan-charged lipid carriers. Haloferax volcanii can be functionally replaced by its haloarchaeal homologues
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
despite processing distinct lipid-linked glycans in their native hosts, AglB from Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei can readily replace their counterpart from Haloferax volcanii when introduced into Haloferax volcanii cells deleted of aglB
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
haloarchaeal AglB proteins display substrate promiscuity. Haloferax volcanii, Haloarcula marismortui, Halobacterium salinarum, and Haloferax mediterranei AglB each contain distinct glycan-charged lipid carriers. Haloferax volcanii can be functionally replaced by its haloarchaeal homologues
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
transfer of a preassembled, uniform oligosaccharide (Glc3Man9GlcNAc2 in most eukaryotes) from the isoprenoid lipid carrier dolichol diphosphate to the side-chain amide group nitrogen of an asparagine residue contained in a N-X-S(T) sequon of the polypeptide substrate, where X can be any amino acid except proline, mechanism, overview
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
transfer of a preassembled, uniform oligosaccharide (Glc3Man9GlcNAc2 in most eukaryotes) from the isoprenoid lipid carrier dolichol pyrophosphate to the side-chain amide group nitrogen of an asparagine residue contained in a N-X-S(T) sequon of the polypeptide substrate, where X can be any amino acid except proline, mechanism, modeling, overview
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
transfer of a preassembled, uniform oligosaccharide (Glc3Man9GlcNAc2 in most eukaryotes) from the isoprenoid lipid carrier dolichol diphosphate to the side-chain amide group nitrogen of an asparagine residue contained in a N-X-S(T) sequon of the polypeptide substrate, where X can be any amino acid except proline, mechanism, overview
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-oligosaccharide
i.e. substrate peptide LLO prepared from Pyrococcus furiosus cells and a substrate peptide, TAMRAAla-Pro-Tyr-Asn-Val-Thr-Lys-Arg, which is optimized by peptide library experiments
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine, product analysis by mass spectrometry
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-oligosaccharide
i.e. substrate peptide LLO prepared from Pyrococcus furiosus cells and a substrate peptide, TAMRAAla-Pro-Tyr-Asn-Val-Thr-Lys-Arg, which is optimized by peptide library experiments
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine, product analysis by mass spectrometry
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
PglB, the key enzyme of the Campylobacter jejuni N-glycosylation system, transfers O polysaccharide from a lipid carrier (undecaprenyl pyrophosphate) to an accept or protein. PglB is the only protein of the bacterial N-glycosylation machinery both necessary and sufficient for the transfer
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
PglB has relaxed specificity toward its lipid-linked glycan substrate. It can transfer its endogenous substrate, the heptasaccharide Glc(GalNAc)5Bac of Campylobacter jejuni, as well as different O antigen polysaccharides that are assembled by the rhamnosyltransferase (polymerase)-dependent mechanism on the lipid carrier undecaprenyl diphosphate
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
to investigate the substrate specificity of PglB, the transfer of a set of lipid-linked polysaccharides in Escherichia coli and Salmonella enterica serovar typhimurium is tested. A hexose linked to the C-6 of the monosaccharide at the reducing end does not inhibit the transfer of the O antigen to the acceptor protein. PglB requires an acetamido group at the C-2. A model for the mechanism of PglB involving this functional group is proposed. Eukaryotic and prokaryotic OTases catalyze the transfer of oligosaccharides by a conserved mechanism. Substitution at the C-6 position in the reducing end of the oligosaccharide does not prevent its PglB-mediated transfer to the protein acceptor AcrA. PglB transferrs a polysaccharide that is assembled by a Wzy-protein-independent pathway. An N-acetyl group in position 2 of the sugar directly linked to the undecaprenyl diphosphate carrier is necessary for recognition and/or catalysis
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
model glycoprotein carboxypeptidase Y. STT3 from Leishmania is able to complement stt3 deficiency in yeast during vegetative growth, but only poorly during sporulation. Transfers efficiently shortened lipid-linked-mannose oligosaccharides. The Leishmania STT3 homolog is functional mainly as a free enzyme with a broad specificity for the glycosyl donor. When incorporated into the OST complex, it accepts the common Glc3Man9GlcNAc2-PP-Dol donor. Three out of the four STT3 paralogs are able to functionally complement not only an stt3 mutant but also ost1, ost2, wbp1, or swp1 mutants
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
various LmOTases have different protein substrate affinities when expressed in yeast. Biosynthetic intermediates as well as the complete Glc3Man9GlcNAc2 oligosaccharide are transferred efficiently to protein by the LmSTT3D OTase isoform without any apparent substrate specificity
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
asparagine-linked glycosylation is a common posttranslational modification of diverse secretory and membrane proteins in eukaryotes, where it is catalyzed by the multiprotein complex oligosaccharyltransferase. Eukaryotic oligosaccharyltransferase is a multifunctional enzyme that acts at the crossroads of protein modification and protein folding
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
oligosaccharyl transferase (OT) is a multisubunit enzyme that catalyzes N-linked glycosylation of nascent polypeptides in the lumen of the endoplasmic reticulum
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
oligosaccharyltransferase complex catalyzes the transfer of a lipid-linked core oligosaccharide onto asparagine residues of nascent polypeptide chains in the lumen of the endoplasmic reticulum
-
-
?
dolichyl-diphosphochitobiose-Man7Glc3 + protein-L-asparagine
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man9Glc3 + protein-L-asparagine
?
-
-
-
-
?
dolichyl-diphosphochitobiose-Man9Glc3 + protein-L-asparagine
?
-
-
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
-
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in synthesis of N-linked glycoproteins
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
the DAD1 subunit is a defender against apoptotic cell death
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in synthesis of N-linked glycoproteins
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
N-glycosylation of eukaryotic secretory and membrane-bound proteins is an essential and highly conserved protein modification. The key step in this pathway is the en bloc transfer of the high mannose core oligosaccharide Gly3Man9GlcNAc2 from the lipid carries dolichyl phosphate to selected Asn-X-Ser/Thr sequences of nascent polypeptide chains during their translocation across the endoplasmic reticulum membrane
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
dolichyl-diphosphochitobiose-Man9Glc3 is the preferred glycosyl donor both in vivo and in vitro
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
the enzyme catalyzes the glycosylation of selected asparagine residues of nascent polypeptide chains as they are translocated into the lumen of the endoplasmic reticulum
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
N-glycosylation of eukaryotic secretory and membrane-bound proteins is an essential and highly conserved protein modification. The key step in this pathway is the en bloc transfer of the high mannose core oligosaccharide Gly3Man9GlcNAc2 from the lipid carries dolichyl phosphate to selected Asn-X-Ser/Thr sequences of nascent polypeptide chains during their translocation across the endoplasmic reticulum membrane
-
-
-
additional information
?
-
the STT3a subunit isoform mediates specific protein glycosylation steps that are necessary for cell cycle progression during osmotic stres adaption
-
-
-
additional information
?
-
-
salt stress caused growth inhibition, aberrant root-tip morphology, and callose accumulation in cgl1, is observed in an ER oligosaccharyltransferase mutant, staurosporin and temperature sensitive 3a
-
-
-
additional information
?
-
-
a set of peptides, TAMRA-Gly-X-X-X-Val-Thr-NH2, where the X-X-X sequence is varied for testing the N-glycosylation dependency, is validated as substrates
-
-
-
additional information
?
-
a set of peptides, TAMRA-Gly-X-X-X-Val-Thr-NH2, where the X-X-X sequence is varied for testing the N-glycosylation dependency, is validated as substrates
-
-
-
additional information
?
-
a set of peptides, TAMRA-Gly-X-X-X-Val-Thr-NH2, where the X-X-X sequence is varied for testing the N-glycosylation dependency, is validated as substrates
-
-
-
additional information
?
-
-
key enzyme of Campylobacter jejuni N-glycosylation system, transfers O-polysaccharides from a lipid carrier (undecaprenyl pyrophosphate) to an acceptor protein. PglB is the only protein of the bacterial N-glycosylation machinery both necessary and sufficient for the transfer
-
-
-
additional information
?
-
-
PglB can transfer diverse oligosaccharides and polysaccharides from Escherichia coli and Pseudomonas aeruginosa to proteins, in addition to the Campylobacter jejuni glycan. PglB attaches O7 polysaccharides and Campylobacter jejuni oligosaccharides to the same Asn residue in AcrA
-
-
-
additional information
?
-
-
PglB transfers a wide variety of saccharides
-
-
-
additional information
?
-
-
no activity with acetyl-NVAAT-(para-nitrophenylalanine)-NH2 and acetyl-DVAAT-(para-nitrophenylalanine)-NH2
-
-
-
additional information
?
-
-
deletion of stt3, the only component of the oligosaccharide transferase complex detected in archaea, does not affect cell viability, it appears that N-glycosylation is not essential in Haloferax volcanii
-
-
-
additional information
?
-
-
the transcription of aglB, aglF, aglG and aglI is regulated in a coordinated manner
-
-
-
additional information
?
-
the PglB1-dependent N-glycosylation with a linear pentasaccharide requires an acidic residue at the -2 position of the N-glycosylation sequon
-
-
-
additional information
?
-
-
the PglB1-dependent N-glycosylation with a linear pentasaccharide requires an acidic residue at the -2 position of the N-glycosylation sequon
-
-
-
additional information
?
-
-
fine regulation of OTase activity is essential for normal cognitive-function development
-
-
-
additional information
?
-
-
minimal activity with alpha-linked dolichyl monophosphate N-acetylglucosamine and no glycosylation activity with peptide Ac(YKYQESSYKpNF)NH2
-
-
-
additional information
?
-
-
allosteric communication between regulatory and catalytic dolichol-linked oligosaccharide binding sites
-
-
-
additional information
?
-
-
evidence against either enol lactone or ketone formation as an intermediate
-
-
-
additional information
?
-
-
oligosaccharyl transferase catalyzes the first committed step in N-linked protein glycosylation, a cotranslational process that occurs in the lumen of the endoplasmic reticulum
-
-
-
additional information
?
-
-
Pkc1p cascade controls N-glycosylation by regulation of Stt3p activity
-
-
-
additional information
?
-
-
the enzyme catalyzes the key step of N-glycosylation of proteins in the endoplasmic reticulum by the hetero-oligomeric protein complex oligosaccharyltransferase. It transfers the lipid-linked core-oligosaccharide to selected Asn-X-Ser/Thr sequences of nascent polypeptide chains
-
-
-
additional information
?
-
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
-
tight association of DAD1 with the active OST complex with specific interactions between the N-terminal domain of DAD1 and subunit OST48
-
-
-
Please wait a moment until the data is sorted. This message will disappear when the data is sorted.
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
Campylobacter jejuni heptasaccharide bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
alpha-1,3-linked sugar, in vivo in Escherichia coli
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
Escherichia coli group 1 K30 capsule antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
in vivo in Escherichia coli
-
-
?
Escherichia coli O16 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
alpha-1,6-linked Glc with GlcNAc, in vivo in Escherichia coli
-
-
?
Escherichia coli O2 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
rhamnose beta-1,4-linked sugar, in vivo in Escherichia coli
-
-
?
Escherichia coli O7 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
beta-1,3-linked sugar, in vivo in Escherichia coli
-
-
?
Escherichia coli O86 antigen bound to farnesyl diphosphate + pilin
farnesyl diphosphate + glycosylated pilin
-
pentasaccharide attached to other lipid carrier, in vitro, 500 mM Tris-HCl containing 1 M sucrose and 10 mM MnCl2, pH7.5, 30°C
-
-
?
N-acetyl-D-glucosamine + glycoprotein bound to polysaccharide cell wall
?
-
glycoproteins as substrates are P15703, O13547, P53301, P32623, P28319, P38248, P22146, Q03655, Q08193, P38616
-
-
?
peptidoglycan bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
transfer of subunit of the peptidoglycan petapeptide, no transfer of the complete peptidoglycan is observed, in vivo in Salmonella enterica
-
-
?
Pseudomonas aeruginosa O11 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
FucNac, in vivo in Escherichia coli
-
-
?
Salmonella enterica O antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
in vivo in Escherichia coli
-
-
?
Salmonella typhimurium LT2 antigen bound to undecaprenyl diphosphate + pilin
undecaprenyl diphosphate + glycosylated pilin
-
in vivo in Escherichia coli, in vivo in Salmonella enterica serovar Typhimurium LT2 strain
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
Q5HTX9
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
P39007
-
-
-
?
dolichyl diphosphooligosaccharide + protein L-asparagine
dolichyl disphosphate + protein with oligosaccharide attached to protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
O29918
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
O29918
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
transfer of a preassembled, uniform oligosaccharide (Glc3Man9GlcNAc2 in most eukaryotes) from the isoprenoid lipid carrier dolichol diphosphate to the side-chain amide group nitrogen of an asparagine residue contained in a N-X-S(T) sequon of the polypeptide substrate, where X can be any amino acid except proline, mechanism, overview
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
transfer of a preassembled, uniform oligosaccharide (Glc3Man9GlcNAc2 in most eukaryotes) from the isoprenoid lipid carrier dolichol pyrophosphate to the side-chain amide group nitrogen of an asparagine residue contained in a N-X-S(T) sequon of the polypeptide substrate, where X can be any amino acid except proline, mechanism, modeling, overview
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
P48439, Q03723
-
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-L-asparagine-N-oligosaccharide
-
transfer of a preassembled, uniform oligosaccharide (Glc3Man9GlcNAc2 in most eukaryotes) from the isoprenoid lipid carrier dolichol diphosphate to the side-chain amide group nitrogen of an asparagine residue contained in a N-X-S(T) sequon of the polypeptide substrate, where X can be any amino acid except proline, mechanism, overview
a glycoprotein with the oligosaccharide chain attached by N-beta-D-glycosyl linkage to a protein L-asparagine
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
PglB, the key enzyme of the Campylobacter jejuni N-glycosylation system, transfers O polysaccharide from a lipid carrier (undecaprenyl pyrophosphate) to an accept or protein. PglB is the only protein of the bacterial N-glycosylation machinery both necessary and sufficient for the transfer
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
P33767 and Q02791 and P39007 and P41543 and P48439
-
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
Q03723
asparagine-linked glycosylation is a common posttranslational modification of diverse secretory and membrane proteins in eukaryotes, where it is catalyzed by the multiprotein complex oligosaccharyltransferase. Eukaryotic oligosaccharyltransferase is a multifunctional enzyme that acts at the crossroads of protein modification and protein folding
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
P39007
oligosaccharyl transferase (OT) is a multisubunit enzyme that catalyzes N-linked glycosylation of nascent polypeptides in the lumen of the endoplasmic reticulum
-
-
?
dolichyl diphosphooligosaccharide + [protein]-L-asparagine
dolichyl diphosphate + [protein]-N-oligosaccharidyl-L-asparagine
-
oligosaccharyltransferase complex catalyzes the transfer of a lipid-linked core oligosaccharide onto asparagine residues of nascent polypeptide chains in the lumen of the endoplasmic reticulum
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
-
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in synthesis of N-linked glycoproteins
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
the DAD1 subunit is a defender against apoptotic cell death
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in synthesis of N-linked glycoproteins
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
central enzyme in the pathway of glycoprotein assembly
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
P48439
N-glycosylation of eukaryotic secretory and membrane-bound proteins is an essential and highly conserved protein modification. The key step in this pathway is the en bloc transfer of the high mannose core oligosaccharide Gly3Man9GlcNAc2 from the lipid carries dolichyl phosphate to selected Asn-X-Ser/Thr sequences of nascent polypeptide chains during their translocation across the endoplasmic reticulum membrane
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
P48439
dolichyl-diphosphochitobiose-Man9Glc3 is the preferred glycosyl donor both in vivo and in vitro
-
-
-
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
the enzyme catalyzes the glycosylation of selected asparagine residues of nascent polypeptide chains as they are translocated into the lumen of the endoplasmic reticulum
-
-
?
lipid-linked oligosaccharide + unfolded nascent polypeptide chain
?
-
N-glycosylation of eukaryotic secretory and membrane-bound proteins is an essential and highly conserved protein modification. The key step in this pathway is the en bloc transfer of the high mannose core oligosaccharide Gly3Man9GlcNAc2 from the lipid carries dolichyl phosphate to selected Asn-X-Ser/Thr sequences of nascent polypeptide chains during their translocation across the endoplasmic reticulum membrane
-
-
-
additional information
?
-
Q93ZY3
the STT3a subunit isoform mediates specific protein glycosylation steps that are necessary for cell cycle progression during osmotic stres adaption
-
-
-
additional information
?
-
-
salt stress caused growth inhibition, aberrant root-tip morphology, and callose accumulation in cgl1, is observed in an ER oligosaccharyltransferase mutant, staurosporin and temperature sensitive 3a
-
-
-
additional information
?
-
-
key enzyme of Campylobacter jejuni N-glycosylation system, transfers O-polysaccharides from a lipid carrier (undecaprenyl pyrophosphate) to an acceptor protein. PglB is the only protein of the bacterial N-glycosylation machinery both necessary and sufficient for the transfer
-
-
-
additional information
?
-
-
PglB transfers a wide variety of saccharides
-
-
-
additional information
?
-
-
deletion of stt3, the only component of the oligosaccharide transferase complex detected in archaea, does not affect cell viability, it appears that N-glycosylation is not essential in Haloferax volcanii
-
-
-
additional information
?
-
-
fine regulation of OTase activity is essential for normal cognitive-function development
-
-
-
additional information
?
-
-
oligosaccharyl transferase catalyzes the first committed step in N-linked protein glycosylation, a cotranslational process that occurs in the lumen of the endoplasmic reticulum
-
-
-
additional information
?
-
-
Pkc1p cascade controls N-glycosylation by regulation of Stt3p activity
-
-
-
additional information
?
-
-
the enzyme catalyzes the key step of N-glycosylation of proteins in the endoplasmic reticulum by the hetero-oligomeric protein complex oligosaccharyltransferase. It transfers the lipid-linked core-oligosaccharide to selected Asn-X-Ser/Thr sequences of nascent polypeptide chains
-
-
-
additional information
?
-
P33767
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
P41543
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
Q02795
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
Q92316
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
Q99380
it may be that the lumenal domain of Ost1p is involved in funneling the newly synthesized polypeptides into the active site on Stt3p for the glycosylation oligosaccharyl transferase reaction
-
-
-
additional information
?
-
-
tight association of DAD1 with the active OST complex with specific interactions between the N-terminal domain of DAD1 and subunit OST48
-
-
-
Please wait a moment until the data is sorted. This message will disappear when the data is sorted.
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
Mg2+
Mn2+
Mg2+
-
30% as effective as Mn2+; absolute requirement for a divalent cation, Mg2+ is 30% as effective as Mn2+; inhibition above 3 mM
Mg2+
-
divalent cation required. Mg2+, at concentration of 10 mM yields only one third the activity observed with Mn2+
Mg2+
-
absolute requirement for divalent cations that can adopt an octahedral coordination geometry with preference for Mn2+ over Mg2+
Mn2+
-
the enzyme requires the addition of divalent metal cations such as Mn2+
Mn2+
-
absolute requirement for divalent cations that can adopt an octahedral coordination geometry with preference for Mn2+ over Mg2+
Please wait a moment until the data is sorted. This message will disappear when the data is sorted.
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
L-threoninamide, (2S)-2-(benzoylamino)-4-[(phenylmethyl)amino]butanoylglycyl-L-threonyl-L-valyl
-
-
L-threoninamide, (2S)-2-(benzoylamino)-4-[[(4-methoxyphenyl)methyl]amino]butanoylglycyl-L-threonyl-L-valyl
-
-
L-threoninamide, (2S)-2-(benzoylamino)-4-[[(4-nitrophenyl)methyl]amino]butanoylglycyl-L-threonyl-L-valyl
-
-
L-Threoninamide, (2S)-2-[(6-mercapto-1-oxohexyl)amino]-4-[(2-naphthalenylmethyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-, cyclic (1-2)-thioether
-
-
L-Threoninamide, (2S)-2-[(6-mercapto-1-oxohexyl)amino]-4-[(2-naphthalenylmethyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-N-(2-phenylethyl)-, cyclic (1-2)-thioether
-
-
L-Threoninamide, (2S)-2-[(6-mercapto-1-oxohexyl)amino]-4-[(2-naphthalenylmethyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-N-[2-(4-nitrophenyl)ethyl]-, cyclic (1-2)-thioether
-
-
L-Threoninamide, (2S)-4-(decylamino)-2-[(6-mercapto-1-oxohexyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-, cyclic (1-2)-thioether
-
-
L-threoninamide, (2S)-4-amino-2-[(6-mercapto-1-oxohexyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-, cyclic (1-2)-thioether
-
-
L-Threoninamide, (2S)-4-amino-2-[(6-mercapto-1-oxohexyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-N-(2-phenylethyl)-, cyclic (1-2)-thioether
-
-
L-Threoninamide, (2S)-4-amino-2-[(6-mercapto-1-oxohexyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-N-(4-phenylbutyl)-, cyclic (1-2)-thioether
-
-
L-Threoninamide, (2S)-4-amino-2-[(6-mercapto-1-oxohexyl)amino]butanoyl-L-cysteinyl-L-threonyl-L-valyl-N-[2-(4-nitrophenyl)ethyl]-, cyclic (1-2)-thioether
-
-
N-dinitrobenzoyl-Arg-Asn-Ala-epoxyethylglycine-Ala-Val
-
Asn residue of the inhibitor is glycosylated during inactivation
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ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
additional information
-
DAD1 might provide structural and functional integrity for the OST complex
-
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DISEASE
TITLE OF PUBLICATION
LINK TO PUBMED
Adenocarcinoma
Role of the Sec14-like domain of Dbl family exchange factors in the regulation of Rho family GTPases in different subcellular sites.
Congenital Disorders of Glycosylation
Mutations in STT3A and STT3B cause two congenital disorders of glycosylation.
Congenital, Hereditary, and Neonatal Diseases and Abnormalities
Mutations in STT3A and STT3B cause two congenital disorders of glycosylation.
Dengue
Dengue Virus Hijacks a Noncanonical Oxidoreductase Function of a Cellular Oligosaccharyltransferase Complex.
Dengue
The major oligosaccharyl transferase complex genes are not involved in dengue virus replication in Aedes aegypti mosquitoes.
Glioma
Oligosaccharyltransferase inhibition Reduces Receptor Tyrosine Kinase Activation and Enhances Glioma Radiosensitivity.
Infections
Dengue Virus Hijacks a Noncanonical Oxidoreductase Function of a Cellular Oligosaccharyltransferase Complex.
Leukemia
Identification of differentially expressed genes following treatment of monkey kidney cells with the mycotoxin fumonisin B(1).
Lung Neoplasms
Oligosaccharyltransferase Inhibition Overcomes Therapeutic Resistance to EGFR Tyrosine Kinase Inhibitors.
Neoplasms
Identification of differentially expressed genes following treatment of monkey kidney cells with the mycotoxin fumonisin B(1).
Neoplasms
Oligosaccharyltransferase inhibition induces senescence in RTK-driven tumor cells.
Neoplasms
Oligosaccharyltransferase Inhibition Overcomes Therapeutic Resistance to EGFR Tyrosine Kinase Inhibitors.
Neuronal Ceroid-Lipofuscinoses
Dolichyl-pyrophosphoryloligosaccharide protein oligosaccharide transferase in neuronal ceroid-lipofuscinosis.
Ovarian Neoplasms
Loss of the oligosaccharyl transferase subunit TUSC3 promotes proliferation and migration of ovarian cancer cells.
Trypanosomiasis, African
Single-subunit oligosaccharyltransferases of Trypanosoma brucei display different and predictable peptide acceptor specificities.
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.05
Tyr-Asn-Leu-Thr-Ser-Val
-
reaction with dolichyl diphosphochitobiose-Man9Glc3
0.6
Tyr-Asn-Leu-Thr-Ser-Val
-
reaction with dolichyl diphosphochitobiose
additional information
additional information
-
kinetic study with intact microsomal membrane. Km-value for Nalpha-Ac-Asn-Leu-Thr-NHCH3 is 0.01 mM
-
additional information
additional information
dissociation constant KD=9.97 mM
-
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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
additional information
additional information
-
development of an in vitro assay, which uses polyacrylamide gel electrophoresis as the separation mechanism. The peptide substrate is labeled with a fluorescent dye, and the glycopeptide products are detected and quantified by fluorescence gel imaging. This method will is efficient and user-friendly
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
7.5
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pH RANGE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
6 - 8
-
pH 6.0: about 30% of maximal activity, pH 8.0: about 20% of maximal activity
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TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
putative oligosaccharyltransferase
UniProt
brenda
-
488495, 488496, 488507, 488508, 488510, 488515, 657676, 659293, 673322, 673634, 673879, 674447, 675004, 676793, 676816, 676874, 677125, 690092, 707520, 708603, 709952, 710425, 720164
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-
brenda
dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit OST6
SwissProt
brenda
dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit STT3
SwissProt
brenda
the enzyme consists of nine subunits. Five of them, Wbp1, Swp1, Stt3, Ost1, and Ost2, are essential for viability of the cell, whereas Ost4, Ost5, Ost3, and Ost6 are not essential but are required for maximal OST activity: Wbp1 (P33767 (SwissProt)), Swp1 (Q02795 (SwissProt)), Stt3 (P39007 (SwissProt)), Ost1 (P41543 (SwissProt)), Ost2 (P46964 (SwissProt)), Ost3 (P48439 (SwissProt)), Ost4 (Q99380 (SwissProt)), Ost5, and Ost6
SwissProt
brenda
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SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
SOURCE
additional information
-
TbSTT3A transcribed in the bloodstream nor procyclic form; TbSTT3B transcribed in the bloodstream nor procyclic form; TbSTT3C not transcribed in the bloodstream nor procyclic form
brenda
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LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY
GeneOntology No.
LITERATURE
SOURCE
-
oligosaccharyltransferase forms a binary complex with ribosomes. Reconstitution of a binary complex containing oligosaccharyltransferase and ribosomes and its electron microscopic images. Oligosaccharyltransferase, the Sec61 complex, and ribosomes form a ternary complex in vitro
brenda
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multiple oligosaccharyl transferase isoforms with different affinities for the translocon and ribosome and with heterogeneous subunit composition might exist in the endoplasmic reticulum membrane, thereby providing a means of regulating protein N-glycosylation
brenda
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oligosaccharyl transferase has a large domain in the lumenal side of endoplasmic reticulum where the catalysis occurs. The lumenal domain mainly comprises the catalytic Stt3p, the donor substrate-recognizing Wbp1p, and the acceptor substrate-recognizing Ost1p
brenda
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oligosaccharyl transferase has a large domain in the lumenal side of endoplasmic reticulum where the catalysis occurs. The lumenal domain mainly comprises the catalytic Stt3p, the donor substrate-recognizing Wbp1p, and the acceptor substrate-recognizing Ost1p
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brenda
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OST48, ribophorin I and ribophorin II possess a type I membrane topology with the bulk of their polypeptide chains directed to towards the lumen of the endoplasmic reticulum
brenda
reaction takes place in the lumen; reaction takes place in the lumen
brenda
PglB possesses 11 transmembrane segments and two relatively large periplasmic regions other than the C-terminal domain
brenda
-
membrane protein complex. Ost2p and Stt3p have only their N terminus located in the cytosol. Ost3p and Swp1p have only their C terminus oriented in the cytosol. In the case of Ost5p and Ost6p, both their N and C termini are present in the cytosol
brenda
-
multiple oligosaccharyl transferase isoforms with different affinities for the translocon and ribosome and with heterogeneous subunit composition might exist in the endoplasmic reticulum membrane, thereby providing a means of regulating protein N-glycosylation
brenda
oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. Ost4p is a minimembrane protein; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. Ost5p is a membrane protein; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. Swp1p probably possesses three transmembrane segments, with its N-terminus in the lumen and C-terminus in the cytosol; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. The functional domain of Ost1p is its membrane-anchored lumenal domain; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. The Ost2 protein possesses three transmembrane segments, with its N-terminus in the cytosol and C-terminus directed towards the lumen; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. The sequence of the lumen-oriented half of the transmembrane domain is important for the function of the Wbp1 protein
brenda
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OST48, ribophorin I and ribophorin II possess a type I membrane topolyogy with the bulk of their polypeptide chains directed towards the lumen of the endoplasmic reticulum
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
-
ribophorin I and II are integral membrane glycoproteins
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
-
the enzyme is oriented at the luminal face of the endoplasmic membrane
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
-
integral membrane protein, tightly associated to luminal side of membrane
brenda
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
evolution
malfunction
metabolism
physiological function
additional information
evolution
the catalytic subunit of OST is called STT3 in eukaryotes, AglB in archaea, and PglB in eubacteria. Archaeoglobus f ulgidus encodes three AglB paralogues, two of them are the shortest AglBs across all domains of life.
evolution
-
OST is a heterooligomeric membrane protein complex in animals, plants, and fungi. In bacteria, archaea, and protozoa, OST is a monomer
evolution
-
OST is a heterooligomeric membrane protein complex in animals, plants, and fungi. In bacteria, archaea, and protozoa, OST is a monomer
evolution
-
OST is a heterooligomeric membrane protein complex in animals, plants, and fungi. In bacteria, archaea, and protozoa, OST is a monomer
evolution
-
the catalytic subunit of OST is called STT3 in eukaryotes, AglB in archaea, and PglB in eubacteria. Archaeoglobus f ulgidus encodes three AglB paralogues, two of them are the shortest AglBs across all domains of life.
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malfunction
congenital disorders of glycosylation (CDG) have severe effects in humans, complete loss is lethal for eukaryots
malfunction
-
simultaneous TbSTT3A and TbSTT3B knockdown prevents parasite growth in the bloodstream
malfunction
-
mutations affecting the biosynthesis of the activated Glc3Man9GlcNAc2 oligosaccharide substrate or the biogenesis of OSTs generally have a systemic effect in eukaryotes and alter glycosylation of many different glycoproteins
malfunction
-
mutations affecting the biosynthesis of the activated Glc3Man9GlcNAc2 oligosaccharide substrate or the biogenesis of OSTs generally have a systemic effect in eukaryotes and alter glycosylation of many different glycoproteins. It is the substrate specificity of OST that translates defects in the biosynthesis of the oligosaccharide substrate into a generalized and multisystemic deficiency observed for the different forms of human congenital disorders of glycosylation type I. Mutations in the subunit paralogues N33/Tusc3 and IAP do not yield the pleiotropic phenotypes typical for CDG type I but specifically result in nonsyndromic mental retardation
malfunction
-
instability of the temperature-sensitive DAD1 mutant at restrictive temperature causes a time-dependent degradation of the other OST subunits ribophorin I, ribophorin II, and OST48, disrupting the entire OST complex. Loss of OST activity caused by DAD1 instability results in severe hypoglycosylation that might induce apoptosis. Mutations affecting the biosynthesis of the activated Glc3Man9GlcNAc2 oligosaccharide substrate or the biogenesis of OSTs generally have a systemic effect in eukaryotes and alter glycosylation of many different glycoproteins
metabolism
-
in the central reaction of the N-linked glycosylation pathway, one of the most abundant modifications of proteins in eukaryoties, oligosaccharyltransferase, a multimeric complex located at the membrane of the endoplasmic reticulum, transfers a preassembled oligosaccharide to selected asparagine residues within the consensus sequence asparagine-X-serine/threonine
metabolism
-
in the central reaction of the N-linked glycosylation pathway, one of the most abundant modifications of proteins in eukaryotes, oligosaccharyltransferase, a multimeric complex located at the membrane of the endoplasmic reticulum, transfers a preassembled oligosaccharide to selected asparagine residues within the consensus sequence asparagine-X-serine/threonine
metabolism
-
in the central reaction of the N-linked glycosylation pathway, one of the most abundant modifications of proteins in eukaryoties, oligosaccharyltransferase, a multimeric complex located at the membrane of the endoplasmic reticulum, transfers a preassembled oligosaccharide to selected asparagine residues within the consensus sequence asparagine-X-serine/threonine
physiological function
N-linked glycosylation of nascent polypeptides in the lumen of the endoplasmic reticulum
physiological function
-
TbSTT3A and TbSTT3B N-glycosylation together is essential for infectivity in mice
physiological function
-
free monomeric enzyme with broad specificity for nonglucosylated lipid-linked mannose-oligosaccharides typical for protists, incorporated in yeast enzyme complex it also transfers the common eukaryotic Glc3Man9GlcNAc2-PP-Dol donor
physiological function
-
O-glycosylation of type IV pilins in bacteria
physiological function
-
subunits Ost3p and Ost6p are necessary for efficient glycosylation of distinct defined glycosylation sites
physiological function
oligosaccharyltransferase transfers glycan to asparagine in the N-glycosylation sequon, the lysine and isoleucine residues in the DK/MI motif participate in the Ser/Thr recognition in the sequon
physiological function
-
In the yeast OST complex, OST4p regulates the incorporation of the two functionally equivalent, but mutually exclusive, subunits OST3p and OST6p. the catalytic subunit of the eukaryotic OST and catalyzes the transfer of a highly defined, lipid-linked oligosaccharide (LLO) donor substrate to a multitude of peptide acceptor sequences located in different substrate proteins
physiological function
-
the catalytic subunit of the eukaryotic OST and catalyzes the transfer of a highly defined, lipid-linked oligosaccharide (LLO) donor substrate to a multitude of peptide acceptor sequences located in different substrate proteins. The Stt3 subunit of OST harbors the catalytic center of the enzyme, and some components of the OST complex are involved in the recognition and utilization of glycosylation sites in specific glycoproteins. The oxidoreductase activity of subunits N33/Tusc3 and IAP is required for glycosylation of a subset of proteins essential for brain development
physiological function
-
the catalytic subunit of the eukaryotic OST and catalyzes the transfer of a highly defined, lipid-linked oligosaccharide (LLO) donor substrate to a multitude of peptide acceptor sequences located in different substrate proteins
physiological function
asparagine-linked glycosylation is a common and vital co- and post-translocational modification of diverse secretory and membrane proteins in eukaryotes that is catalyzed by the multiprotein complex oligosaccharyltransferase. Isozymes Ost3p or Ost6p possess different protein substrate specificities at the level of individual glycosylation sites, model of Ost3/6p function in which they transiently bind stretches of nascent polypeptide substrate to inhibit protein folding, thereby increasing glycosylation efficiency at nearby asparagine residues; asparagine-linked glycosylation is a common and vital co- and post-translocational modification of diverse secretory and membrane proteins in eukaryotes that is catalyzed by the multiprotein complex oligosaccharyltransferase. Ispzymes Ost3p or Ost6p possess different protein substrate specificities at the level of individual glycosylation sites. Ost6p, which has a peptide-binding groove with a strongly hydrophobic base lined by neutral and basic residues, binds peptides enriched in hydrophobic and acidic amino acids. Model of Ost3/6p function in which they transiently bind stretches of nascent polypeptide substrate to inhibit protein folding, thereby increasing glycosylation efficiency at nearby asparagine residues
physiological function
-
oligosaccharyltransferase transfers glycan to asparagine in the N-glycosylation sequon, the lysine and isoleucine residues in the DK/MI motif participate in the Ser/Thr recognition in the sequon
-
additional information
-
OST complexes containing Stt3-B are more active than OST complexes harboring Stt3-A. Stt3-A and Stt3-B also differ in their acceptor substrate selectivity
additional information
-
Canine OST isoforms harboring the different Stt3 proteins differ in catalytic activity and substrate selectivity. OST complexes with the Stt3-B isoform are more active reaching 8 to 12fold higher Vmax values for glycopeptide formation than complexes containing Stt3-A. The increased catalytic activity for Stt3-B complexes coincides with a reduced selectivity with respect to the oligosaccharide donor substrate. OST complexes with Stt3-B accept the dolichol-pyrophosphate-activated Glc3Man9GlcNAc2 and Man9GlcNAc2 substrates with roughly the same specificity, whereas OST complexes with Stt3-A are more selective, as reflected by increased Km values forMan9GlcNAc2 relative to Glc3Man9GlcNAc2. Stt3-A and Stt3-B also differ in their acceptor substrate selectivity
additional information
Ost3p structure-function relationship, overview; Ost6p structure-function relationship, overview
additional information
Ost3p structure-function relationship, overview; Ost6p structure-function relationship, overview
Show AA Sequence and Transmembrane Helices (343 entries)
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Please use the AA Sequence and Transmembrane Helices Search for a specific query.
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PDB
SCOP
CATH
UNIPROT
ORGANISM
Archaeoglobus fulgidus (strain ATCC 49558 / VC-16 / DSM 4304 / JCM 9628 / NBRC 100126)
Pyrococcus horikoshii (strain ATCC 700860 / DSM 12428 / JCM 9974 / NBRC 100139 / OT-3)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Archaeoglobus fulgidus (strain ATCC 49558 / VC-16 / DSM 4304 / JCM 9628 / NBRC 100126)
Archaeoglobus fulgidus (strain ATCC 49558 / VC-16 / DSM 4304 / JCM 9628 / NBRC 100126)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
6000
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
9500
16000
30000
31500
MALDI-TOF result in accordance with calculated results for histidine-tagged protein subunit Stt3p
32000
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
34000
45000
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
47000
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
48000
48900
-
x * 48900, OST48, + x * 68700, ribophorin I, + x * 69300, ribophorin II + ?, calculation from nucleotide sequence
64000
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
68700
-
x * 48900, OST48, + x * 68700, ribophorin I, + x * 69300, ribophorin II + ?, calculation from nucleotide sequence
69300
-
x * 48900, OST48, + x * 68700, ribophorin I, + x * 69300, ribophorin II + ?, calculation from nucleotide sequence
78000
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
80000
92000
-
recombinant monomeric Leishmania major SST3 enzyme with FLAG-tag, calculated and confirmed by SDS-PAGE
180000
-
non-denaturing PAGE; recombinant Leishmania major SST3 with FLAG-tag, BN-PAGE probed with anti-FLAG antiserum
480000
500000
9500
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
9500
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
16000
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
16000
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
30000
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
30000
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
34000
-
x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
34000
-
x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
480000
-
recombinant Leishmania major SST3 (with exception of SST3-3) incorporated in the yeast oligosaccharyltransferase complex when native yeast SST3 is not expressed, BN-PAGE
480000
-
oligosaccharyltransferase complex, native polyacrylamide gel electrophoresis
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SUBUNIT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
dimer
heptamer
nonamer
-
the enzyme consists of nine subunits. Five of them, Wbp1, Swp1, Stt3, Ost1, and Ost2, are essential for viability of the cell, whereas Ost4, Ost5, Ost3, and Ost6 are not essential but are required for maximal OST activity: Wbp1 (49392 Da), Swp1 (31653 Da), Stt3 (81529 Da), Ost1 (54072 Da), Ost2 (14698 Da), Ost3, Ost4, Ost5, and Ost6, calculated from sequence
octamer
-
eight polypeptides assemble into a heterooctameric yeast OST complex composed of one copy each of Ost1p, Ost2p, Ost3p or Ost6p, Ost4p, Ost5p, Wbp1p, Swp1p, and Stt3p
additional information
?
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x * 78000, Stt3p, + x * 64000, Ost1p, + x * 45000, Wbp1p, + x * 34000, Ost3p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p, the enzyme is composed of equimolar amounts of eight subunits, the enzyme is composed of the following three subcomplexes: 1. Stt3p-Ost4p-Ast3p, 2. Swp1p-Wbp1p-Ost2p0, 3. Ost1p-Aso5p, SDS-PAGE
?
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x * 62000-64000, Ost1p, + x * 6000, Stt3p, + x * 47000, Wbp1p, + x * 34000, Ost3p, + x * 32000, Ost6p, + x * 30000, Swp1p, + x * 16000, Ost2p, + x * 9500, Ost5p, + x * 3600, Ost4p
?
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x * 48900, OST48, + x * 68700, ribophorin I, + x * 69300, ribophorin II + ?, calculation from nucleotide sequence
heptamer
-
heteromeric OST complex comprising seven subunits, Stt3 proteins are the catalytic subunits of eukaryotic OST complexes, structure-function relationships, ddetailed overview. In the yeast OST complex, OST4p regulates the incorporation of the two functionally equivalent, but mutually exclusive, subunits OST3p and OST6p
heptamer
-
the human Ost4 protein contains 37 amino acids, i.e. MITDVQLAIFANMLGVSLFLLVVLYHYVAVNNPKKQE, Ost4 is a small membrane protein and belongs to one of the seven subunits of human OST, structure analysis by NMR spectroscopy, residues 5-30 adopt an alpha-helical structure, and a kink structure in the transmembrane domain may be important for its function, overview
heptamer
-
the heptameric human OST complex contains the subunits ribophorin I (OST1p), ribophorin II (Swp1p), OST48 (Wbp1p), OST4 (OST4), Stt3-A/Stt3-B (Stt3p), N33/Tusc3 and IAP (OST3p and OST6p), and DAD1 (OST2p), struccture-function relationships, Stt3 proteins are the catalytic subunits of eukaryotic OST complexes, detailed overview. Human OST4 contains a very short luminal segment with one transmembrane span followed by a cytoplasmic part consisting of approximately ten residues
heptamer
-
heteromeric OST complex comprising seven subunits, Stt3 proteins are the catalytic subunits of eukaryotic OST complexes, structure-function relationships, detailed overview. Canine OST isoforms harboring the different Stt3 proteins differ in catalytic activity and substrate selectivity. OST complexes with the Stt3-B isoform are more active reaching 8 to 12fold higher Vmax values for glycopeptide formation than complexes containing Stt3-A
additional information
Archaeoglobus AglB lacks a beta-barrel-like structure found in other AglBs and PglBs,but AglB contains a kinked helix bearing a conserved motif, called DK/MI motif, it is a variant type of the DK motif with the insertion, this particular type of the DK motif contributes to the activity. Structure comparisons, overview
additional information
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Archaeoglobus AglB lacks a beta-barrel-like structure found in other AglBs and PglBs,but AglB contains a kinked helix bearing a conserved motif, called DK/MI motif, it is a variant type of the DK motif with the insertion, this particular type of the DK motif contributes to the activity. Structure comparisons, overview
-
additional information
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oligosaccharyltransferase activity is mediated by a protein complex composed of ribophorin I, 66000 Da, and ribophorin II, 63000 Da, and a 48000 Da protein
additional information
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the 12500 Da DAD1 protein is a tightly associated subunit of the OST both in intact membrane and in purified enzyme
additional information
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multiple distinct protein complexes (OSTC(I), OSTC(II) and OSTC(III) are detected. All known mammalian OST subunits 8STT3-A, ribophorin I, ribophorin II, OST48 and DAD1) are present in all complexes and the proteins DC2 and KCP2 (keratinocyte-associated protein 2) are copurified with OST
additional information
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subunit STT3-A is only recovered in the OST-III peak, while STT3-B subunit coelutes with OST-I and OST-II. Oligosaccharyltransferase isoforms that contain different catalytic STT3 subunits have distinct enzymatic properties. OST isoforms that incorporate STT3-B as a subunit are substantially more active and show a reduced ability to discriminate between donor substrates with different oligosaccharide structures
additional information
-
after SDS-PAGE the most active fractions contain four predominant protein bands with apparent molecular weight in the 50000 Da to 65000 Da range. N-terminal sequence analysis identifies the protein as ribophorin I, ribophorin II, and a 50000 Da homologue of Wbp1, a yeast protein essential for N-glycosylation
additional information
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subunit STT3-A and SST3-B are both expressed in skin fibroblasts
additional information
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subunit STT3-A and SST3-B are both expressed in lymphoma cell line CH12-LX
additional information
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multimeric membrane-bound enzyme complex comprising nine integral membrane subunits
additional information
-
protein complex oligosaccharyltransferase consists of two isoforms with distinct functions differing only in the presence of the two related Ost3 and Ost6p proteins. The OST6-complex is found to be important for cell wall integrity and temperature stress. Ost3p and Ost6p are not essential for OST activity, and can in part displace each other in the complex when overexpressed
additional information
-
analysis of the organization of the translocon-oligosaccharyl transferase supercomplex using chemical cross-linking and splitubiquitin analysis
additional information
-
oligosaccharyl transferase subunits display specific interactions with each other in a functional complex. A distinct conformation rearrangement takes place when the enzyme complex changes from the nonfunctional state to the activated functional state
additional information
-
multimeric complex containing eight different proteins, one of which (Stt3p) is the catalytic subunit
additional information
-
the oligosaccharyl transferase complex contains nine subunits. The purified OT complex has an apparent mass of about 500000 Da, suggesting a dimeric configuration. The dimeric structure of OT might be required for effective association with the translocon dimer and for its allosteric regulation during cotranslational glycosylation
additional information
oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Four others are not essential Ost3p, Ost4p, Ost5p, Ost6p. Ost2p may aid Wbp1p in recognition of the Dol-PP-oligosaccharide; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Ost4p functions to bind Ost3p and Stt3p together in a subcomplex of oligosaccharyl transferase via interactions with its amino-acid residues near the cytosolic leaflet of the endoplasmic reticulum membrane. Ost4p is proposed to be responsible for recruiting Ost3p or Ost6p into the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Since the lumenal domain of Swp1p interacts with that of Ost1p, it may aid Ost1p in funneling nascent polypeptide chains into the active site of the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Specific interaction between Ost3p and Sbh1p
additional information
oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Four others are not essential Ost3p, Ost4p, Ost5p, Ost6p. Ost2p may aid Wbp1p in recognition of the Dol-PP-oligosaccharide; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Ost4p functions to bind Ost3p and Stt3p together in a subcomplex of oligosaccharyl transferase via interactions with its amino-acid residues near the cytosolic leaflet of the endoplasmic reticulum membrane. Ost4p is proposed to be responsible for recruiting Ost3p or Ost6p into the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Since the lumenal domain of Swp1p interacts with that of Ost1p, it may aid Ost1p in funneling nascent polypeptide chains into the active site of the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Specific interaction between Ost3p and Sbh1p
additional information
oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Four others are not essential Ost3p, Ost4p, Ost5p, Ost6p. Ost2p may aid Wbp1p in recognition of the Dol-PP-oligosaccharide; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Ost4p functions to bind Ost3p and Stt3p together in a subcomplex of oligosaccharyl transferase via interactions with its amino-acid residues near the cytosolic leaflet of the endoplasmic reticulum membrane. Ost4p is proposed to be responsible for recruiting Ost3p or Ost6p into the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Since the lumenal domain of Swp1p interacts with that of Ost1p, it may aid Ost1p in funneling nascent polypeptide chains into the active site of the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Specific interaction between Ost3p and Sbh1p
additional information
oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Four others are not essential Ost3p, Ost4p, Ost5p, Ost6p. Ost2p may aid Wbp1p in recognition of the Dol-PP-oligosaccharide; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Ost4p functions to bind Ost3p and Stt3p together in a subcomplex of oligosaccharyl transferase via interactions with its amino-acid residues near the cytosolic leaflet of the endoplasmic reticulum membrane. Ost4p is proposed to be responsible for recruiting Ost3p or Ost6p into the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Since the lumenal domain of Swp1p interacts with that of Ost1p, it may aid Ost1p in funneling nascent polypeptide chains into the active site of the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Specific interaction between Ost3p and Sbh1p
additional information
oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Four others are not essential Ost3p, Ost4p, Ost5p, Ost6p. Ost2p may aid Wbp1p in recognition of the Dol-PP-oligosaccharide; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Ost4p functions to bind Ost3p and Stt3p together in a subcomplex of oligosaccharyl transferase via interactions with its amino-acid residues near the cytosolic leaflet of the endoplasmic reticulum membrane. Ost4p is proposed to be responsible for recruiting Ost3p or Ost6p into the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Since the lumenal domain of Swp1p interacts with that of Ost1p, it may aid Ost1p in funneling nascent polypeptide chains into the active site of the oligosaccharyl transferase complex; oligosaccharyl transferase consists of nine different subunits, all of which contain one or more predicted transmembrane segments. In yeast, five of these proteins are encoded by essential genes, Swp1p, Wbp1p, Ost2p, Ost1p and Stt3p. Specific interaction between Ost3p and Sbh1p
additional information
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six different subunits are detected in the wild-type complex, including Stt3p, Ost1p, Wbp1p, Swp1p, Ost3p, and Ost6p. The small 3.4-kDa subunit Ost4p is required for the incorporation of either Ost3p or Ost6p into the complex, resulting in two, functionally distinct OTase complexes in vivo. Ost3p and Ost6p are not absolutely required for OTase activity, but modulate the affinity of the enzyme toward different protein substrates
additional information
dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit STT3: 81529 Da
additional information
functional and structural investigations of the Ost3/6p components of the yeast enzyme. Genetic, biochemical and structural analyses of the lumenal domain of Ost6p reveals oxidoreductase activity mediated by a thioredoxin-like fold with a distinctive active-site loop that changed conformation with redox state
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POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
glycoprotein
glycoprotein
-
the large soluble domains of the subunits Nlt1p and Wbp1p are glycosylated
glycoprotein
oligosaccharyl transferase consists of nine different subunits. Three of the essential gene products, Ost1p, Wbp1p, and Stt3p, are N-linked glycoproteins. The four potential N-glycosylation sites in Ost1p and the two potential N-glycosylation sites in Wbp1p are occupied in the mature proteins. None of the N-glycosylation sites in these two proteins is conserved, and no defect in growth or oligosaccharyl transferase activity is observed when the N-glycosylation sites are mutated to block N-glycosylation in either subunit. Glycan chain of the Stt3p subunit (Man8GlcNAc2) is linked only to Asn539
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CRYSTALLIZATION/commentary
ORGANISM
UNIPROT
LITERATURE
C-terminal globular domain of the of the smallest AglB, purified recombinant wild-type and selenomethionine-labeled AgBs, sitting and hanging drop vapor diffusion methods, crystals grow from a hanging drop with a 1:1 volume ratio of the protein stock solution containing 20 mg/mL protein in 20 mM Tris buffer, pH 8.0, and the reservoir solution containing 0.1 M MES buffer, pH 6.5, and 12.5% PEG 3350, at 20°C, soaking of crystals in reservoir solution with 20% ethylene glycol added for cryoprotection, X-ray diffraction structure determination and analysis at 1.75-1.94 A resolution
sitting drop vapor diffusion method, crystal structure of the C-terminal globular domain of the AglB paralog, AglB-Long, at 1.9 A resolutions
2.8 A resolution crystal structure of the C-terminal globular domain, hanging drop method; hanging drop crystallization with 10 mM Tris-HCl, pH 8.0, and reservoir solution (0.1 M sodium cacodylate, pH 6.5, 18% polyethylene glycol 8000, 0.2 M calcium acetate, 20°C, cryoprotection with 0.1 M MES, pH 6.5, polyethylene glycol 8000, and 0.2 M calcium acetate)
2.7 A resolution crystal structure of the C-terminal soluble domain of Pyrococcus STT3
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sitting drop vapor diffusion method, dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit OST6
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PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
D520A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
D520N
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
D526A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
E521A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
E521Q
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
I522A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
I535A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
K531A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows similar OST activity compared to the wild-type enzyme
K531D
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
K531E
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
K531R
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
M524A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
N528A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
T518A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
T523A
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
D520A
-
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
-
D520N
-
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
-
D526A
-
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant cannot be expressed in Escherichia coli
-
E521Q
-
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
-
T523A
-
site-directed mutagensis of the AglB-S1 subunit of OST, the mutant shows reduced OST activity compared to the wild-type enzyme
-
D54A
XXD motif mutation, strongly reduced activity compared to wild-type
I571A
MI motif mutation, strongly reduced activity compared to wild-type
N53A
XXD motif mutation, about 40% activity remains compared to wild-type
S52D
XXD motif mutation, strongly reduced activity compared to wild-type
S52E
XXD motif mutation, strongly reduced activity compared to wild-type
D54A
-
XXD motif mutation, strongly reduced activity compared to wild-type
-
N53A
-
XXD motif mutation, about 40% activity remains compared to wild-type
-
G374D
-
the missense mutation lies in the second half of the N-terminal luminal domain of ribophorin II subunit, the affected patient presents a fairly mild clinical phenotype, no clear genotype-phenotype correlation for this mutation
D647A
-
mutant does not support glycosylation in vivo, no growth of yeast cells
D706A
-
mutant does not support glycosylation in vivo, no growth of yeast cells
D97A
-
mutant does not support glycosylation in vivo, no growth of yeast cells
E45E
-
reduced oligosaccharyltransferase activity, sufficient to allow growth of yeast cells