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Enzyme Nomenclature
Information on EC 2.4.1.257 - GDP-Man:Man2GlcNAc2-PP-dolichol alpha-1,6-mannosyltransferase
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EC Tree
2.4.1.257 GDP-Man:Man2GlcNAc2-PP-dolichol alpha-1,6-mannosyltransferaseIUBMB Comments
The biosynthesis of asparagine-linked glycoproteins utilizes a dolichyl diphosphate-linked glycosyl donor, which is assembled by the series of membrane-bound glycosyltransferases that comprise the dolichol pathway. Alg2 mannosyltransferase from Saccharomyces cerevisiae carries out an alpha1,3-mannosylation (cf. EC 2.4.1.132) of beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation, to form the first branched pentasaccharide intermediate of the dolichol pathway [1,2].
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The expected taxonomic range for this enzyme is: Eukaryota, Archaea, Bacteria
Reaction Schemes
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SYNONYM 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
Alg2
Alg2 mannosyltransferase
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol = GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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PATHWAY SOURCE
PATHWAYS
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SYSTEMATIC NAME
IUBMB Comments
GDP-D-mannose:D-Man-alpha-(1->3)-D-Man-beta-(1-4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol alpha-6-mannosyltransferase
The biosynthesis of asparagine-linked glycoproteins utilizes a dolichyl diphosphate-linked glycosyl donor, which is assembled by the series of membrane-bound glycosyltransferases that comprise the dolichol pathway. Alg2 mannosyltransferase from Saccharomyces cerevisiae carries out an alpha1,3-mannosylation (cf. EC 2.4.1.132) of beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation, to form the first branched pentasaccharide intermediate of the dolichol pathway [1,2].
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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
2 GDP-alpha-D-mannose + beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-GlcNAc-PP-phytanyl
2 GDP + alpha-D-Man-(1->3)[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-PP-phytanyl
synthesis of acceptor phytanyl oligosaccharide, Man1Gn2-PPhy, from beta-D-GlcNAc-(1->4)-GlcNAc-PP-phytanyl (Gn2-PPhy) using yeast Alg1. Recombinant scAlg2 transfers 2 Man residues to the beta1,4-Man of the Man1Gn2-PPhy substrate with alpha1,6 and alpha1,3-linkages, yielding alpha-D-Man-(1->3)[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-PP-phytanyl
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?
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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?
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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?
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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?
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
in eukaryotes, biosynthesis of N-glycans starts with the assembly of the common core oligosaccharide precursor Glc3Man9 GlcNAc2-PP-Dol, the glycan moiety of which is subsequently transferred onto selected Asn-Xaa-(Ser/Thr) acceptor sites of the nascent polypeptide chain by the oligosaccharyl-transferase complex
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?
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
the biosynthesis of asparagine-linked glycoproteins utilizes a dolichylpyrophosphate-linked glycosyl donor, which is assembled by the series of membrane-bound glycosyltransferases that comprise the dolichol pathway. Alg2 carries out an alpha1,3-mannosylation of D-Man-beta-(1-4)-D-GlcNAc-beta-(1-4)-D-GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation, to form the first branched pentasaccharide intermediate of the dolichol pathway
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?
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
Alg2 carries out an alpha1,3-mannosylation of D-Man-beta-(1-4)-D-GlcNAc-beta-(1-4)-D-GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation, to form the first branched pentasaccharide intermediate of the dolichol pathway
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?
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
Alg2 is able to catalyze both the addition of the alpha1,3- and alpha1,6-linked mannose residue to Man1GlcNAc2-PP-Dol, forming Man2GlcNAc2-PP-Dol (cf. EC 2.4.1.132) and subsequently to Man3GlcNAc2-PP-Dol
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?
additional information
?
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chemo-enzymatic synthesis of lipid-linked GlcNAc2Man5 oligosaccharides using recombinant Alg1, Alg2 and Alg11 proteins. Comparison to the reaction of dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit STT3A (EC 2.4.99.18)
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additional information
?
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Alg2 shows no activity with D-Man-beta-(1-4)-D-GlcNAc-beta-(1-4)-D-GlcNAc-diphosphodolichol
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?
additional information
?
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unique bifunctionality of Alg2 during lipid-linked oligosaccharide (LLO) synthesis
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additional information
?
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unique bifunctionality of Alg2 during lipid-linked oligosaccharide (LLO) synthesis
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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
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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?
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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?
GDP-alpha-D-mannose + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
GDP + alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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?
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
in eukaryotes, biosynthesis of N-glycans starts with the assembly of the common core oligosaccharide precursor Glc3Man9 GlcNAc2-PP-Dol, the glycan moiety of which is subsequently transferred onto selected Asn-Xaa-(Ser/Thr) acceptor sites of the nascent polypeptide chain by the oligosaccharyl-transferase complex
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?
GDP-alpha-D-mannose + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
GDP + D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol
the biosynthesis of asparagine-linked glycoproteins utilizes a dolichylpyrophosphate-linked glycosyl donor, which is assembled by the series of membrane-bound glycosyltransferases that comprise the dolichol pathway. Alg2 carries out an alpha1,3-mannosylation of D-Man-beta-(1-4)-D-GlcNAc-beta-(1-4)-D-GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation, to form the first branched pentasaccharide intermediate of the dolichol pathway
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METALS and IONS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY
GeneOntology No.
LITERATURE
SOURCE
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physical interactions between the Alg1, Alg2, and Alg11 mannosyltransferases
brenda
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
malfunction
cells deleted for ALG2 are inviable. Mutant alg2 alleles display intraallelic complementation
metabolism
the fourth and fifth steps of lipid-linked oligosaccharide (LLO) synthesis are catalyzed by Alg2, an unusual mannosyltransferase (MTase) with two different MTase activities
physiological function
additional information
the conserved C-terminal EX7E motif, N-terminal cytosolic tail, and 3G-rich loop motifs in Alg2 play crucial roles for these activities, both in vitro and in vivo. Alg2 immunoprecipitates from extracts of yeast microsomal membranes also displays both alpha1,3- and alpha1,6-mannosyltransferase (MTase) activities. The conserved Val62 residue is required for yeast Alg2 function. The first E (E335) and His-336 are partially required for alpha1,6-mannosylation, and importance of both E335 and E343 of the EX7E domain for Alg2 function in vivo. Identification of three conserved G-rich motifs in scAlg2, located in the N-terminal cytosolic short tail, in the middle of Alg2, and in the C-terminal domain. Residues G17, G19, and G20 are within the N-terminal cytosolic tail of Alg2, importance of this domain for Alg2 function
physiological function
asparagine (N)-linked glycosylation requires the ordered, stepwise synthesis of lipid-linked oligosaccharide (LLO) precursor Glc3Man9GlcNAc2-diphosphate-dolichol (Glc3Man9Gn2-PDol) on the endoplasmic reticulum. The fourth and fifth steps of LLO synthesis are catalyzed by Alg2, an unusual mannosyltransferase (MTase) with two different MTase activities. Alg2 adds both an alpha1,3- and alpha1,6-mannose onto ManGlcNAc2-PDol to form the trimannosyl core Man3GlcNAc2-PDol. Alg2-dependent Man3GlcNAc2-PDol production relies on net-neutral lipids with a propensity to form bilayers
physiological function
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asparagine (N)-linked glycosylation requires the ordered, stepwise synthesis of lipid-linked oligosaccharide (LLO) precursor Glc3Man9GlcNAc2-diphosphate-dolichol (Glc3Man9Gn2-PDol) on the endoplasmic reticulum. The fourth and fifth steps of LLO synthesis are catalyzed by Alg2, an unusual mannosyltransferase (MTase) with two different MTase activities. Alg2 adds both an alpha1,3- and alpha1,6-mannose onto ManGlcNAc2-PDol to form the trimannosyl core Man3GlcNAc2-PDol. Alg2-dependent Man3GlcNAc2-PDol production relies on net-neutral lipids with a propensity to form bilayers
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Show AA Sequence and Transmembrane Helices (3485 entries)
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POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
E335A
E335A/E343A
significant lower level of product formation, identical to that of the E335A mutant
E343A
F337A
site-directed mutagenesis, Trx-scAlg2F337A produces 26% Man3Gn2 product compared to wild-type enzyme
G377R
site-directed mutagenesis, a temperature-sensitive alg2-1 mutant containing a single missense mutation, catalytically inactive
H336A
V62G
site-directed mutagenesis, Trx-scAlg2V62G produces 25% Man3Gn2 product compared to wild-type enzyme. The HA-tagged mutant allele (3HAscAlg2V62G) fails to complement the lethality of the alg2DELTA LSY2 when grown on 5-FOA
additional information
E335A
site-directed mutagenesis, Trx-scAlg2E335A produces only no final product and only 32% of intermediate Man2Gn2 compared to wild-type enzyme
H336A
site-directed mutagenesis, Trx-scAlg2H336A produces 8% Man3Gn2 product compared to wild-type enzyme
additional information
chemo-enzymatic synthesis of lipid-linked GlcNAc2Man5 oligosaccharides using recombinant Alg1 (from yeast, EC 2.4.1.142), Alg2, and Alg11 (from yeast, EC 2.4.1.131) proteins, chemo-enzymatic synthesis strategy to extend the glycan moiety of synthetic LLO analogues to Dol-PP-GlcNAc2Man5, method, overview
additional information
mutational analysis of Alg2 and identification of amino acids required for its activity. None of the four domains (predicted as transmembrane-spanning helices) is essential for transferase activity because truncated Alg2 variants can exert their function as long as Alg2 is associated with the endaplasmic reticulum by either its N- or C-terminal hydrophobic regions
additional information
site-directed mutagenesis of conserved EX7E motif. Trx-scAlg2E335A, mutated in the first E, has significantly decreased activity, producing no final product and only 32% of intermediate Man2Gn2. Trx-scAlg2E343A, mutated in the second E, has no detectable activity. The intervening amino acids of the EX7E are also important, though less than either E335 or E343. Trx-scAlg2H336A and Trx-scAlg2F337A produce 8% and 26% of Man3Gn2 product, respectively, compared to wild-type. Cells deleted for ALG2 are inviable, a plasmid shuffling technique is used to measure complementation. Mutant alg2 alleles display intraallelic complementation. Mutations (changed to proline) in five of the glycines (G19, G20, G256, G357, G358) result in complete loss of activity, while two of them (G17, G257) are significantly decreased
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PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
recombinant N-terminal thioredoxin (Trx)-His6-tagged wild-type and mutant ALG2s from Escherichia coli strain DE3 membranes, preparation of proteoliposomes
recombinant N-terminally His10-YFP tagged enzyme from HEK-293 cells by solubilization from membranes with detergent, nickel affinity chromatography, and gel filtration
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CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
gene ALG2, cloning from Saccharomyces cerevisiae strain W303a, recombinant expression of wild-type and mutant N-terminal thioredoxin (Trx)-His6-tagged enzymes in Escherichia coli strain DE3
gene ALG2, transient recombinant expression of N-terminally His10-YFP tagged enzyme in HEK-293 cells
overexpression in Escherichia coli. Two Alg2 constructs are expressed and isolated, one with the N-terminal TRX domain and C-terminal His and V5 epitope tags and the other with only an N-terminal His tag
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
synthesis
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engineering of a synthetic pathway in Escherichia coli for the production of eukaryotic trimannosyl chitobiose glycans and the transfer of these glycans to specific asparagine residues in target proteins. Glycan biosynthesis is enabled by four eukaryotic glycosyltransferases, including the yeast uridine diphosphate-N-acetylglucosamine transferases Alg13 and Alg14 and the mannosyltransferases Alg1 and Alg2. By including the bacterial oligosaccharyltransferase PglB from Campylobacter jejuni, glycans are successfully transferred to eukaryotic proteins
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REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Gao, X.D.; Nishikawa, A.; Dean, N.
Physical interactions between the Alg1, Alg2, and Alg11 mannosyltransferases of the endoplasmic reticulum
Glycobiology
14
559-570
2004
Saccharomyces cerevisiae
brenda
O'Reilly, M.K.; Zhang, G.; Imperiali, B.
In vitro evidence for the dual function of Alg2 and Alg11: essential mannosyltransferases in N-linked glycoprotein biosynthesis
Biochemistry
45
9593-9603
2006
Saccharomyces cerevisiae (P43636)
brenda
Kmpf, M.; Absmanner, B.; Schwarz, M.; Lehle, L.
Biochemical characterization and membrane topology of Alg2 from Saccharomyces cerevisiae as a bifunctional alpha1,3- and 1,6-mannosyltransferase involved in lipid-linked oligosaccharide biosynthesis
J. Biol. Chem.
284
11900-11912
2009
Saccharomyces cerevisiae (P43636)
brenda
Valderrama-Rincon, J.D.; Fisher, A.C.; Merritt, J.H.; Fan, Y.Y.; Reading, C.A.; Chhiba, K.; Heiss, C.; Azadi, P.; Aebi, M.; DeLisa, M.P.
An engineered eukaryotic protein glycosylation pathway in Escherichia coli
Nat. Chem. Biol.
8
434-436
2012
Saccharomyces cerevisiae
brenda
Li, S.-T.; Wang, N.; Xu, X.-X.; Fujita, M.; Nakanishi, H.; Kitajima, T.; Dean, N.; Gao, X.-D.
Alternative routes for synthesis of N-linked glycans by Alg2 mannosyltransferase
FASEB J.
32
2492-2506
2018
Saccharomyces cerevisiae (P43636), Saccharomyces cerevisiae ATCC 204508 (P43636)
brenda
Ramirez, A.S.; Boilevin, J.; Lin, C.W.; Ha Gan, B.; Janser, D.; Aebi, M.; Darbre, T.; Reymond, J.L.; Locher, K.P.
Chemo-enzymatic synthesis of lipid-linked GlcNAc2Man5 oligosaccharides using recombinant Alg1, Alg2 and Alg11 proteins
Glycobiology
27
726-733
2017
Homo sapiens (Q9H553)
brenda
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