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The experiments reported in the present paper were designed to check the model proposed for Ca2+ binding in the preceding paper (Forge, V., Mintz, E., and Guillain, F. (1993) J. Biol. Chem. 268, 10953-10960). The pH dependence of the Mg(2+)-induced variation of the intrinsic fluorescence, as well as that of the phosphorylation by Pi, confirmed that there are several species of Ca(2+)-deprived ATPase. Kinetics of Ca2+ binding as a function of pH suggested that the deprotonated form of the ATPasepmid:8496160 fatcat:5wt7pagpbjahdb2urw6xczjvcy