Lysophosphatidic acid acyltransferase which functions in phosphatidic acid biosynthesis. Is highly specific for lysophosphatidic acid and able to use different acyl-CoA donors. May regulate neutral lipid accumulation and participate in the regulation of lipid turnover in vegetative cells. Possesses additional triacylglycerol lipase and phospholipase A2 activities in vitro. Is not active as esterase or lysophospholipase. a 1-acyl-sn-glycero-3-phosphate + an acyl-CoA = a 1,2-diacyl-sn-glycero-3-phosphate + CoA Does not associate with endogenous lipid droplets. A number of isoforms are produced. According to EST sequences. The HXXXXD motif is essential for acyltransferase activity and may constitute the binding site for the phosphate moiety of the glycerol-3-phosphate. Accumulation of neutral lipid droplets with marked increase in absolute triacylglycerol levels in leaf mesophyll cells. Belongs to the peptidase S33 family. ABHD4/ABHD5 subfamily. Truncated N-terminus. Truncated N-terminus.