Coenzyme A-dependent lysophosphatidic acid acyltransferase that catalyzes the transfert of an acyl group on a lysophosphatidic acid (PubMed:19801371). Functions preferentially with 1-oleoyl-lysophosphatidic acid followed by 1-palmitoyl-lysophosphatidic acid, 1-stearoyl-lysophosphatidic acid and 1-arachidonoyl-lysophosphatidic acid as lipid acceptor (PubMed:19801371). Functions preferentially with arachidonoyl-CoA followed by oleoyl-CoA as acyl group donors (PubMed:19801371). Functions in phosphatidic acid biosynthesis (By similarity). May regulate the cellular storage of triacylglycerol through activation of the phospholipase PNPLA2 (PubMed:16679289). Involved in keratinocyte differentiation (By similarity). Regulates lipid droplet fusion (PubMed:26083785). a 1-acyl-sn-glycero-3-phosphate + an acyl-CoA = a 1,2-diacyl-sn-glycero-3-phosphate + CoA (9Z)-octadecenoyl-CoA + 1-(9Z-octadecenoyl)-sn-glycero-3-phosphate = 1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphate + CoA 1-(9Z-octadecenoyl)-sn-glycero-3-phosphate + hexadecanoyl-CoA = 1-(9Z)-octadecenoyl-2-hexadecanoyl-sn-glycero-3-phosphate + CoA 1-(9Z-octadecenoyl)-sn-glycero-3-phosphate + octadecanoyl-CoA = 1-(9Z-octadecenoyl)-2-octadecanoyl-sn-glycero-3-phosphate + CoA (5Z,8Z,11Z,14Z)-eicosatetraenoyl-CoA + 1-(9Z-octadecenoyl)-sn-glycero-3-phosphate = 1-(9Z)-octadecenoyl-2-(5Z,8Z,11Z,14Z)-eicosatetraenoyl-sn-glycero-3-phosphate + CoA 1-(9Z-octadecenoyl)-sn-glycero-3-phosphate + eicosanoyl-CoA = 1-(9Z)-octadecenoyl-2-eicosanoyl-sn-glycero-3-phosphate + CoA (9Z)-octadecenoyl-CoA + 1-hexadecanoyl-sn-glycero-3-phosphate = 1-hexadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphate + CoA (9Z)-octadecenoyl-CoA + 1-octadecanoyl-sn-glycero-3-phosphate = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphate + CoA (9Z)-octadecenoyl-CoA + 1-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sn-glycero-3-phosphate = 1-(5Z,8Z,11Z,14Z)-eicosatetraenoyl-2-(9Z)-octadecenoyl-sn-glycero-3-phosphate + CoA Acyltransferase activity is inhibited by detergents such as Triton X-100 and 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS). Acyltransferase activity is inhibited by the presence of magnesium and calcium. Optimum pH is 7-8.5. Preincubation of the enzyme for 10 min at temperatures above 35 degrees Celsius decreases acyltransferase activity subsequently measured at 30 degrees Celsius. Acyltransferase activity is reduced by approximately 60% following 10 min preincubation at47 degrees Celsius. Interacts with ADRP (By similarity). Interacts with PLIN. Interacts with and PNPLA2. Interacts with PLIN5; promotes interaction with PNPLA2. Colocalized with PLIN and ADRP on the surface of lipid droplets. The localization is dependent upon the metabolic status of the adipocytes and the activity of PKA. Highly expressed in the adipose tissue and testes. Weakly expressed in the liver, muscle, kidney, and heart. Expressed by upper epidermal layers and dermal fibroblasts in skin, hepatocytes and hypothalamus in brain (at protein 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 peptidase S33 family. ABHD4/ABHD5 subfamily.