EC Number |
Substrates |
Organism |
Products |
Reversibility |
---|
2.4.1.132 | GDP-alpha-D-mannose + beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol |
hALG2 |
Homo sapiens |
GDP + alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + 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 |
Saccharomyces cerevisiae |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + 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 |
Saccharomyces cerevisiae |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
Alg2 carries out an alpha1,3-mannosylation of Man-beta1,4-GlcNAc-beta1,4-GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation, to form the first branched pentasaccharide intermediate of the dolichol pathway |
Saccharomyces cerevisiae |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
Alg2 is able to catalyze both the addition of the alpa1,3- 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 |
Saccharomyces cerevisiae |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
Saccharomyces cerevisiae |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
Escherichia coli |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
Escherichia coli O141 |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
Saccharomyces cerevisiae ATCC 204508 |
GDP + D-Man-alpha-(1->3)-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol |
- |
? |
2.4.1.132 | GDP-alpha-D-mannose + decyl diphosphate 2-acetamido-2-deoxy-alpha-D-glucopyranose |
i.e. synthetic acceptor GlcNAc-PP-De |
Escherichia coli |
GDP + ? |
- |
? |