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The E-E* model for calcium pumping by the CaATPase of sarcoplasmic reticulum includes two distinct conformational states of the enzyme, E and E*. Exterior Ca 2+ binds only to E and interior Ca 2+ binds only to E*. Therefore, it is expected that there will be competition between the binding of calcium to the unphosphorylated enzyme from the two sides of the membrane. The equilibrium...
Inhibition by calcium of the steady-state turnover of the calcium ATPase from sarcoplasmic reticulum of rabbit muscle follows a Hill slope of 0.8 +/- 0.2 (pH 7.0, 0.1 M KCl, varying [Mg 2+ ] and 2 μM A23187 ionophore). It is concluded that dissociation of the two Ca 2+ ions from E-P.Ca 2 is sequential and that the inhibition arises from the binding of one Ca 2...
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