Enables phosphatidate phosphatase activity and transcription coactivator activity. Involved in lipid metabolic process and positive regulation of transcription by RNA polymerase II. Located in cytosol and endoplasmic reticulum membrane. Is expressed in central nervous system; gonad; liver; lung; and retina. Orthologous to human LPIN2 (lipin 2). [provided by Alliance of Genome Resources, Apr 2022]