The function of GPAT3 (glycerol-3-phosphate acyltransferase 3, ENSG00000138678) is as follows. Converts glycerol-3-phosphate to 1-acyl-sn-glycerol-3- phosphate (lysophosphatidic acid or LPA) by incorporating an acyl moiety at the sn-1 position of the glycerol backbone (PubMed:17170135). Also converts LPA into 1,2-diacyl-sn-glycerol-3-phosphate (phosphatidic acid or PA) by incorporating an acyl moiety at the sn-2 position of the glycerol backbone (PubMed:19318427). Protects cells against lipotoxicity (PubMed:30846318). {ECO:0000269|PubMed:17170135, ECO:0000269|PubMed:19318427, ECO:0000269|PubMed:30846318}.