The influence of hydrogen-ion concentration upon the equilibrium state in phosphorylase systems

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Abstract
Hanes'' interpretation of the effect of H+ on the equilibrium ratio free-P/ester-P in the reversible phosphorylation of starch was extended. Calculations from published data for a plant system (Hanes) and for animal phosphorylase systems (Cori and Cori), over a range of pH values, indicated substantially the same mean values in both types of system for the ratios at equilibrium of similarly charged free-P and ester-P ions. In the plant system these calculated ratios showed the theoretically expected independence of pH, but in the animal systems they drifted consistently upwards as pH increased. Thus the effect of H+ on dissociation of the two acids did not fully explain the observed effect of H+ on the equilibrium state in the animal systems. Further work is needed to determine the precise differences between plant and animal systems.

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