Bidirectional lipid inositolphosphotransferase capable of converting phosphatidylinositol (PI) and ceramide to inositol-phosphorylceramide (IPC) and diacylglycerol (DAG) and vice versa. Direction is dependent on the relative concentrations of DAG and ceramide as phosphoinositol acceptors. Essential for viability of the pathogenic bloodstream stage of this human protozoan parasite and, consequently, can be considered as potential drug target. Belongs to the sphingomyelin synthase family.