May convert lysophosphatidic acid (LPA) into phosphatidic acid by incorporating acyl moiety at the 2 position (By similarity). Has no activity when expressed in bacteria or yeast. a 1-acyl-sn-glycero-3-phosphate + an acyl-CoA = a 1,2-diacyl-sn-glycero-3-phosphate + CoA Phospholipid metabolism; CDP-diacylglycerol biosynthesis; CDP-diacylglycerol from sn-glycerol 3-phosphate: step 2/3. A number of isoforms are produced. According to EST sequences. Widely expressed at low level. The HXXXXD motif is essential for acyltransferase activity and may constitute the binding site for the phosphate moiety of the glycerol-3-phosphate. Belongs to the 1-acyl-sn-glycerol-3-phosphate acyltransferase family.