Catalysis of the addition of a glucose residue to the lipid-linked oligosaccharide precursor for N-linked glycosylation; the transfer of glucose from dolichyl phosphate glucose (Dol-P-Glc) on to the lipid-linked oligosaccharide Man(7)GlcNAc(2)-PP-Dol.
dolichyl-P-Glc:Man7GlcNAc2-PP-dolichyl glucosyltransferase activity