Acyl-CoA-dependent lysophosphatidic acid acyltransferase with preference for oleoyl-CoA. Involved in triacylglyceride homeostasis and lipid droplet formation. Involved in vacuolar protein sorting. a 1-acyl-sn-glycero-3-phosphate + an acyl-CoA = a 1,2-diacyl-sn-glycero-3-phosphate + CoA (9Z)-octadecenoyl-CoA + 1-hexadecanoyl-sn-glycero-3-phosphate = 1-hexadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphate + CoA Lipid droplets consist of a surface phospholipid monolayer and a hydrophobic interior. The latter makes embedding of proteins containing transmembrane segments difficult, and these may instead adopt a hairpin or monotonic conformation when associated with lipid droplet membranes. Always localizes to lipid droplets, irrespective of whether cells are grown on glucose or oleate. Present with 6630 molecules/cell in log phase SD medium. Belongs to the 1-acyl-sn-glycerol-3-phosphate acyltransferase family.