| Entry |
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| Name |
dolichyl-P-Man:Man8GlcNAc2-PP-dolichol alpha-1,2-mannosyltransferase;
ALG9;
ALG9 alpha1,2 mannosyltransferase;
dolichylphosphomannose-dependent ALG9 mannosyltransferase;
ALG9 mannosyltransferase;
Dol-P-Man:Man8GlcNAc2-PP-Dol alpha-1,2-mannosyltransferase;
dolichyl beta-D-mannosyl phosphate:D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol 2-alpha-D-mannosyltransferase
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| Class |
Transferases;
Glycosyltransferases;
Hexosyltransferases
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| Sysname |
dolichyl beta-D-mannosyl phosphate:alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol 2-alpha-D-mannosyltransferase (configuration-inverting)
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| Reaction(IUBMB) |
dolichyl beta-D-mannosyl phosphate + alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol = alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->6)]-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol + dolichyl phosphate [RN: R06261]
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| Reaction(KEGG) |
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| Substrate |
dolichyl beta-D-mannosyl phosphate [CPD: C03862];
alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol
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| Product |
alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->2)-alpha-D-Man-(1->6)]-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol;
dolichyl phosphate [CPD: C00110]
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| Comment |
The formation of N-glycosidic linkages of glycoproteins involves the ordered assembly of the common Glc3Man9GlcNAc2 core-oligosaccharide on the lipid carrier dolichyl diphosphate. Early mannosylation steps occur on the cytoplasmic side of the endoplasmic reticulum with GDP-Man as donor, the final reactions from Man5GlcNAc2-PP-Dol to Man9Glc-NAc2-PP-Dol on the lumenal side use dolichyl beta-D-mannosyl phosphate. ALG9 mannosyltransferase catalyses the addition of two different alpha-1,2-mannose residues: the addition of alpha-1,2-mannose to Man6GlcNAc2-PP-Dol (EC 2.4.1.259) and the addition of alpha-1,2-mannose to Man8GlcNAc2-PP-Dol (EC 2.4.1.261).
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| History |
EC 2.4.1.261 created 1976 as EC 2.4.1.130, part transferred 2011 to EC 2.4.1.261, modified 2012
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| Pathway |
| ec00513 | Various types of N-glycan biosynthesis |
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| Orthology |
| K03846 | alpha-1,2-mannosyltransferase |
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| Genes |
» show all
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| Reference |
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| Authors |
Vleugels W, Keldermans L, Jaeken J, Butters TD, Michalski JC, Matthijs G, Foulquier F |
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| Title |
Quality control of glycoproteins bearing truncated glycans in an ALG9-defective (CDG-IL) patient. |
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| Journal |
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| Reference |
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| Authors |
Frank CG, Aebi M. |
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| Title |
ALG9 mannosyltransferase is involved in two different steps of lipid-linked oligosaccharide biosynthesis. |
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| Journal |
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| Sequence |
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| Other DBs |
| ExPASy - ENZYME nomenclature database: | 2.4.1.261 |
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