Upon cell stimulation converts the second messenger diacylglycerol into phosphatidate, initiating the resynthesis of phosphatidylinositols and attenuating protein kinase C activity (By similarity). May have a role in the development of the embryonic nervous system and the function of the adult nervous system and muscle; regulating signal transduction in neurons. a 1,2-diacyl-sn-glycerol + ATP = a 1,2-diacyl-sn-glycero-3-phosphate + ADP + H(+) In 10-11 hours embryos, expression is abundant in a limited number of cells in the procephalic region and in the ventral nerve cord. Predominantly expressed in the adult nervous system and muscle: including compound eyes, brain cortex, fibrillar muscle, and tubular muscle. Expressed in the embryonic, pupal and adult stages, with little expression during the larval stages. Belongs to the eukaryotic diacylglycerol kinase family.