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The effect of chloride on metal binding by yeast aminopeptidase I, as well as the binding of chloride to various enzyme forms were studied by means of a micro-centrifugation technique using radioactive 36Cl- as a ligand. Chloride did not significantly alter the binding of activating Zn2+, or binding of Co2+ to the essential metal sites. Both the native Zn2+ enzyme and Co2+-substituted aminopeptidase I bind stoichiometric amounts of C1- (1 Cl-/subunit) with apparent dissociation constants of 0.1-0.2 mM. Additional Cl- was bound at higher concentrations. In contrast to the metal-containing enzyme forms the apoenzyme did not express the high-affinity chloride binding site.

Interaction of Chloride with Yeast Aminopeptidase I. Equilibrium Binding Studies