Diacylglycerol kinase that converts diacylglycerol/DAG into phosphatidic acid/phosphatidate/PA and regulates the respective levels of these two bioactive lipids (PubMed:16210324, PubMed:23949095). Thereby, acts as a central switch between the signaling pathways activated by these second messengers with different cellular targets and opposite effects in numerous biological processes (Probable). a 1,2-diacyl-sn-glycerol + ATP = a 1,2-diacyl-sn-glycero-3-phosphate + ADP + H(+) 1,2-di-(9Z-octadecenoyl)-sn-glycerol + ATP = 1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphate + ADP + H(+) Inhibited in response to H(2)O(2). Lipid metabolism; glycerolipid metabolism. Does not form homooligomers. Expressed in testis, and to a lesser extent in placenta. Phosphorylated at Tyr-78 by some member of the SRC family in response to H(2)O(2). Belongs to the eukaryotic diacylglycerol kinase family.