Phosphatidic acid phosphatase (PAP), also called lipin, converts phosphatidate to diacylglycerol (DAG). Diacylglycerol kinase converts DAG to phosphatidate.Phosphatidic acid phosphatase (PAP), also called lipin, converts phosphatidate to diacylglycerol (DAG). Diacylglycerol kinase converts DAG to phosphatidate.