Converts lysophosphatidic acid (LPA) into phosphatidic acid (PA) by incorporating an acyl moiety at the 2 position. This enzyme utilizes acyl-ACP as fatty acyl donor, but not acyl-CoA. a 1-acyl-sn-glycero-3-phosphate + a fatty acyl-[ACP] = a 1,2-diacyl-sn-glycero-3-phosphate + holo-[ACP] Lipid metabolism; phospholipid metabolism. Localized in the septal membrane. The HXXXXD motif is essential for acyltransferase activity and may constitute the binding site for the phosphate moiety of the glycerol-3-phosphate. Cells lacking this gene cease to produce phospholipid and accumulate fatty acids arising from the dephosphorylation of 1-acylglycerol-3-P. Belongs to the 1-acyl-sn-glycerol-3-phosphate acyltransferase family.