Involved in the synthesis of the sugar donor Dol-P-Man which is required in the synthesis of N-linked and O-linked oligosaccharides and for that of GPI anchors. It is required for spore germination. Has an essential role in cellular metabolism. CTP + di-trans,poly-cis-dolichol = a dolichyl phosphate + CDP + H(+) Protein modification; protein glycosylation. Belongs to the polyprenol kinase family.