Enables diacylglycerol kinase activity and enzyme inhibitor activity. Involved in several processes, including glycerolipid metabolic process; lipid phosphorylation; and maintenance of postsynaptic density structure. Acts upstream of or within negative regulation of Ras protein signal transduction. Located in Schaffer collateral - CA1 synapse. Is active in glutamatergic synapse. Is expressed in several structures, including alimentary system; integumental system; nervous system; respiratory system; and sensory organ. Orthologous to human DGKZ (diacylglycerol kinase zeta). [provided by Alliance of Genome Resources, Apr 2022]