ID 2.4.1.259 DE Dolichyl-P-Man:Man(6)GlcNAc(2)-PP-dolichol alpha-1,2-mannosyltransferase. AN Dol-P-Man:Man(6)GlcNAc(2)-PP-Dol alpha-1,2-mannosyltransferase. CA Dolichyl beta-D-mannosyl phosphate + D-Man-alpha-(1->2)-D-Man-alpha- CA (1->2)-D-Man-alpha-(1->3)-(D-Man-alpha-(1->3)-D-Man-alpha-(1->6))-D-Man- CA beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol = D-Man- CA alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-(D-Man-alpha-(1->2)-D- CA Man-alpha-(1->3)-D-Man-alpha-(1->6))-D-Man-beta-(1->4)-D-GlcNAc-beta- CA (1->4)-D-GlcNAc-diphosphodolichol + dolichyl phosphate. CC -!- The formation of N-glycosidic linkages of glycoproteins involves the CC ordered assembly of the common Glc(3)Man(9)GlcNAc(2) core- CC oligosaccharide on the lipid carrier dolichyl diphosphate. CC -!- Early mannosylation steps occur on the cytoplasmic side of the CC endoplasmic reticulum with GDP-Man as donor, the final reactions from CC Man(5)GlcNAc(2)-PP-dolichol to Man(9)Glc-NAc(2)-PP-dolichol on the CC lumenal side use dolichyl beta-D-mannosyl phosphate. CC -!- ALG9 mannosyltransferase catalyzes the addition of two different CC alpha-1,2-mannose residues - the addition of alpha-1,2-mannose to CC Man(6)GlcNAc(2)-PP-dolichol (EC 2.4.1.259) and the addition of alpha- CC 1,2-mannose to Man(8)GlcNAc(2)-PP-dolichol (EC 2.4.1.261). CC -!- Formerly EC 2.4.1.130. DR Q9FZ49, ALG9_ARATH ; Q9H6U8, ALG9_HUMAN ; Q8VDI9, ALG9_MOUSE ; DR Q9P7Q9, ALG9_SCHPO ; P53868, ALG9_YEAST ; //