Figure 1.
Phosphoinositides and their metabolic enzymes in the Phosphoinositide (PI) cycle. (a): Schematic diagram showing the positions of the individual hydroxyl groups in myo–inositol following Agranoff’s turtle concept. (b): metabolism of phosphoinositides depends on several lipases, phosphatases and kinases to catalyze PI-dependent reactions. ?? represents enzymatic reactions that are not completely understood.