ID 2.4.1.132 DE GDP-Man:Man1GlcNAc2-PP-dolichol alpha-1,3-mannosyltransferase. AN GDP-Man:Man1GlcNAc2-PP-Dol alpha-1,3-mannosyltransferase. AN mannosyltransferase II. CA beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphosphodolichol + CA GDP-alpha-D-mannose = alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc- CA (1->4)-alpha-D-GlcNAc-diphosphodolichol + GDP + H(+). CC -!- The biosynthesis of asparagine-linked glycoproteins utilizes a CC dolichyl diphosphate-linked glycosyl donor, which is assembled by the CC series of membrane-bound glycosyltransferases that comprise the CC dolichol pathway. CC -!- Alg2 mannosyltransferase from Saccharomyces cerevisiae carries out an CC alpha1,3-mannosylation of D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D- CC GlcNAc-diphosphodolichol, followed by an alpha1,6-mannosylation (cf. CC EC 2.4.1.257), to form the first branched pentasaccharide CC intermediate of the dolichol pathway. DR Q59LF2, ALG2_CANAL ; Q6FJJ9, ALG2_CANGA ; Q6BVA4, ALG2_DEBHA ; DR Q7KWM5, ALG2_DICDI ; Q755C1, ALG2_EREGS ; Q9H553, ALG2_HUMAN ; DR Q6CWQ0, ALG2_KLULA ; Q9DBE8, ALG2_MOUSE ; Q8X0H8, ALG2_NEUCR ; DR O94738, ALG2_RHIPU ; Q96WW6, ALG2_SCHPO ; Q6C3V7, ALG2_YARLI ; DR P43636, ALG2_YEAST ; //