Information on EC 2.4.1.257 - GDP-Man:Man2GlcNAc2-PP-dolichol alpha-1,6-mannosyltransferase

for references in articles please use BRENDA:EC2.4.1.257
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The expected taxonomic range for this enzyme is: Saccharomyces cerevisiae

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EC NUMBER
COMMENTARY hide
2.4.1.257
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RECOMMENDED NAME
GeneOntology No.
GDP-Man:Man2GlcNAc2-PP-dolichol alpha-1,6-mannosyltransferase
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REACTION
REACTION DIAGRAM
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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
show the reaction diagram
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
protein N-glycosylation initial phase (eukaryotic)
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dolichyl-diphosphooligosaccharide biosynthesis
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N-Glycan biosynthesis
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Various types of N-glycan biosynthesis
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Metabolic 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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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
GDP-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
show the reaction diagram
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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NATURAL SUBSTRATES
NATURAL PRODUCTS
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
GDP-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
show the reaction diagram
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pH OPTIMUM
ORGANISM
UNIPROT
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LITERATURE
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TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
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LITERATURE
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LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
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physical interactions between the Alg1, Alg2, and Alg11 mannosyltransferases
Manually annotated by BRENDA team
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POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
no glycoprotein
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Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
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Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
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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ENGINEERING
ORGANISM
UNIPROT
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LITERATURE
D203A
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mutation has no influence on Alg2 function
D248A
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mutation has no influence on Alg2 function
E264A
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mutation has no influence on Alg2 function
E335A/E343A
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significant lower level of product formation, identical to that of the E335A mutant
G337A
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mutation has no influence on Alg2 function
G337E
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nonfunctional enzyme variant
G337R
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nonfunctional enzyme variant
G338A
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mutation has no influence on Alg2 function
H336A
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mutation has no influence on Alg2 function
K206A
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mutation has no influence on Alg2 function
K210A
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mutation has no influence on Alg2 function
K229A
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mutation has no effect on growth and glycosylation
K230A
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mutation causes loss of Alg2 activity
K251A
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mutation has no influence on Alg2 function
N231A
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mutation has no effect on growth and glycosylation
N392A
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mutation has no influence on Alg2 function
P192A
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mutation has no influence on Alg2 function
P359A
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mutation has no influence on Alg2 function
additional information
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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
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
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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LINKS TO OTHER DATABASES (specific for EC-Number 2.4.1.257)
ExplorEnz
ExPASy
KEGG
MetaCyc
SABIO-RK
NCBI: PubMed, Protein, Nucleotide, Structure, Genome, OMIM
IUBMB Enzyme Nomenclature
PROSITE Database of protein families and domains
InterPro (database of protein families, domains and functional sites)