Enables 1-acylglycerol-3-phosphate O-acyltransferase activity. Acts upstream of or within phosphatidic acid biosynthetic process. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be active in endoplasmic reticulum. Is expressed in several structures, including alimentary system; brain; cardiovascular system; genitourinary system; and immune system. Orthologous to human AGPAT1 (1-acylglycerol-3-phosphate O-acyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]