May play an role in the regulation of Ins(1,4,5)P3 around the endoplasmic reticulum. Predominantly localized to perinuclear areas in both myoblast and myotube C2C12 cells. In the PI-PLC X-box Thr-486 is present instead of the conserved His which is one of the active site residues. It is therefore expected that this protein lacks catalytic activity.