Dolichol kinase
In enzymology, a dolichol kinase () is an enzyme that catalyzes the chemical reaction Thus, the two substrates of this enzyme are CTP and dolichol, whereas its two products are CDP and dolichyl phosphate. This enzyme belongs to the family of transferases, to be specific, those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is CTP:dolichol O-phosphotransferase. This enzyme is also called dolichol phosphokinase. This enzyme participates in N-glycan biosynthesis. In humans dolichol kinase is encoded by the "DOLK" gene. Function. Dolichyl monophosphate is an essential  glycosyl carrier lipid for C- and O-mannosylation and N-glycosylation of proteins and for biosynthesis of glycosylphosphatidylinositol anchors in endoplasmic reticulum (ER). Dolichol kinase catalyzes CTP-mediated phosphorylation of dolichol, the terminal step in de novo dolichyl monophosphate biosynthesis. Clinical significance. Mutations in DOLK cause a subtype of the congenital disorders of glycosylation, DOLK-CDG (CDG-Im).