chitobiosyldiphosphodolichol beta-mannosyltransferase activity
chitobiosyldiphosphodolichol beta-mannosyltransferase activity
Catalysis of the reaction: an N,N'-diacetylchitobiosyl-diphospho-di-trans,poly-cis-dolichol + GDP-alpha-D-mannose = a beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc-diphospho-di-trans,poly-cis-dolichol + GDP + H+.