alpha-1,2-mannosyltransferase activity GDP-Man:Man(3)GlcNAc(2)-PP-Dol alpha-1,2-mannosyltransferase activity https://github.com/geneontology/go-ontology/issues/30193 https://github.com/geneontology/go-ontology/issues/30326 GO:0004377 RHEA:29523 molecular_function glycolipid 2-alpha-mannosyltransferase activity EC:2.4.1.131 Catalysis of the reaction: an alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphospho-di-trans,poly-cis-dolichol + 2 GDP-alpha-D-mannose = an alpha-D-Man-(1->2)-alpha-D-Man-(1->2)-alpha-D-Man-(1->3)-[alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphospho-di-trans,poly-cis-dolichol + 2 GDP + 2 H+. GDP-D-mannose:D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol alpha-1,2-mannosyltransferase activity GDP-mannose-oligosaccharide-lipid mannosyltransferase activity MetaCyc:RXN-5464 guanosine diphosphomannose-oligosaccharide-lipid mannosyltransferase activity GDP-mannose:glycolipid 1,2-alpha-D-mannosyltransferase activity oligosaccharide-lipid mannosyltransferase activity GlcNAc(2)-PP-Dol mannosyltransferase activity