Phosphatidate cytidylyltransferase (also known as CDP- diacylglycerol synthase) (CDS) is the enzyme that catalyzes the synthesis of CDP-diacylglycerol from cytidine triphosphate and phosphatidate. Thus, the two substrates of this enzyme are cytidine triphosphate, or CTP, and phosphatidate, whereas its two products are diphosphate and CDP-diacylglycerol. CDP-diacylglycerol is an important branch point intermediate in both prokaryotic and eukaryotic organisms. CDS is a membrane-bound enzyme. This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing nucleotide groups (nucleotidyltransferases). The systematic**** name**** of**** this**** enzyme**** class is**** . Other names in**** common**** use include **', **********************************************************************************', **********************************************************************************', **********************************************************************************', **********************************************************************************', **********************************************************************************', **********************************************************************************', **********************************************************************************', ************************, and CDP-DG. This enzyme participates in glycerophospholipid metabolism and phosphatidylinositol signaling system.