Acyltransferase with lysophosphatidic acid acyltransferase (LPAAT) activity. Fatty acyl substrates include 18:0-acyl-CoA, 16:0-acyl-CoA, 17:0-acyl-CoA and 14:0-acyl-CoA (PubMed:20694142). Responsible for the acyl-CoA-dependent introduction of saturated very long chain fatty acids (VLCFAs) into phosphatidylinositol, transferring saturated FAs with 18 to 26 carbon atoms (PubMed:27462707). Responsible for the incorporation of stearate into phosphatidylinositol (PubMed:19796168, PubMed:26711260). Overexpression has an effect on chromosome stability (PubMed:10454593). Regulates phosphorylation and expression of glycerol-3-phosphate acyltransferase SCT1 (PubMed:22323296). 1-heptadecanoyl-sn-glycero-3-phosphate + octadecanoyl-CoA = 1-heptadecanoyl-2-octadecanoyl-sn-glycero-3-phosphate + CoA 1-heptadecanoyl-sn-glycero-3-phosphate + tetradecanoyl-CoA = 1-heptadecanoyl-2-tetradecanoyl-sn-glycero-3-phosphate + CoA 1-heptadecanoyl-sn-glycero-3-phosphate + hexadecanoyl-CoA = 1-heptadecanoyl-2-hexadecanoyl-sn-glycero-3-phosphate + CoA The HXXXXD motif is essential for acyltransferase activity and may constitute the binding site for the phosphate moiety of the glycerol-3-phosphate. Phosphoinositides (PIPs) with stearic acyl chains are strongly disturbed. Induces disturbances in intracellular trafficking, alterations in the budding pattern and defects in actin cytoskeleton organization. Present with 2010 molecules/cell in log phase SD medium. Belongs to the 1-acyl-sn-glycerol-3-phosphate acyltransferase family.