GPI mannosyltransferase activity alpha-1,4-mannosyltransferase activity dol-P-Man:GlcN-acyl-PI alpha-1,4-mannosyltransferase activity https://github.com/geneontology/go-ontology/issues/30326 https://github.com/geneontology/go-ontology/issues/30693 RHEA:60500 molecular_function GPI-MT-I activity glycolipid 1,4-alpha-mannosyltransferase activity GO:0180041 glycosylphosphatidylinositol-mannosyltransferase I activity 2024-06-24T10:35:01Z vw Catalysis of the reaction: a 2-acyl-6-alpha-D-glucosaminyl-1-(1-radyl,2-acyl-sn-glycero-3-phospho)-1D-myo-inositol + a di-trans,poly-cis-dolichyl beta-D-mannosyl phosphate = a 2-acyl-6-(alpha-D-mannosyl-(1->4)-alpha-D-glucosaminyl)-1-(1-radyl,2-acyl-sn-glycero-3-phospho)-1D-myo-inositol + a di-trans,poly-cis-dolichyl phosphate + H+.