Catalyzes the transfer of an acyl group from acyl-ACP to glycerol-3-phosphate (G3P) to form lysophosphatidic acid (LPA). This enzyme can utilize either acyl-CoA or acyl-ACP as the fatty acyl donor. an acyl-CoA + sn-glycerol 3-phosphate = a 1-acyl-sn-glycero-3-phosphate + CoA hexadecanoyl-CoA + sn-glycerol 3-phosphate = 1-hexadecanoyl-sn-glycero-3-phosphate + CoA Optimum pH is 8.5. Phospholipid metabolism; CDP-diacylglycerol biosynthesis; CDP-diacylglycerol from sn-glycerol 3-phosphate: step 1/3. Interacts with ACP, YbgC and PssA, forming altogether a complex at the inner membrane. 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 GPAT/DAPAT family. Extended N-terminus.