Plastidial enzyme of the prokaryotic glycerol-3-phosphate pathway that converts lysophosphatidic acid (LPA) into phosphatidic acid by incorporating an acyl moiety at position sn-2 (PubMed:10398728). Utilizes palmitoyl-ACP (16:0-ACP) to produce phosphatidic acid containing a saturated group at position sn-2, which is characteristic of lipids synthesized by the prokaryotic pathway (PubMed:10398728). In vitro, can use 16:0-CoA as acyl donor (PubMed:10398728). a 1-acyl-sn-glycero-3-phosphate + a fatty acyl-[ACP] = a 1,2-diacyl-sn-glycero-3-phosphate + holo-[ACP] 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. Widely expressed. 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. Extended N-terminus.