Catalysis of the reaction: beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-D-GlcNAc-diphosphodolichol + GDP-alpha-D-mannose = alpha-D-Man-(1->3)-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-D-GlcNAc-diphosphodolichol + GDP + H+. This reaction is the transfer of an alpha-D-mannosyl residue from GDP-mannose into lipid-linked oligosaccharide, forming an alpha-(1->3)-D-mannosyl-D-mannose linkage. (Gene Ontology, GO_0004378)
1 genes performing the GDP-Man:Man1GlcNAc2-PP-Dol alpha-1,3-mannosyltransferase activity molecular function from the curated GO Molecular Function Annotations 2025 dataset.
