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Two forms of phospholipase C, hydrolyzing specifically inositol phospholipids, are resoluted and partially purified from rat brain as well as liver cytosol by DEAE-cellulose followed by heparin-Sepharose, Sephacryl S-400, and aminohexyl-Sepharose column chromatographies. With phosphatidylinositol as substrate, at pH 7.4 one is most active at 10(-6) M Ca2+ (Type I) whereas the other requires 10(-3) M Ca2+ (Type II). At pH 5.5 both Type I and II are active at 10(-3) M Ca2+ but essentially inactive at lower concentrations of this divalent cation. Both Type I and II hydrolyze preferentially polyphosphoinositides particularly at lower concentrations of Ca2+.
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