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Treatment of calmodulin-depleted erythrocyte membranes with oleic acid solubilizes only a minor fraction of membrane proteins which, however, contains more than 90% of the total endogenous calmodulin. Concomitantly, Ca2+-ATPase is completely and irreversibly inactivated. By treatment with oleic acid in the presence of Ca.ATP the inactivation of Ca2+-ATPase is abolished to a great extent, the loss of endogenous calmodulin, however, is not affected. Thus, a major participation of endogenous calmodulin in the regulation of Ca2+-ATPase of erythrocyte membranes seems to be improbable.
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