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Carboxypeptidase A (CPA) is a zinc-containing metalloenzyme that catalyzes the hydrolysis of C-terminal peptide bonds in proteins and peptides. The active site of CPA contains a Zn²⁺ ion that plays a crucial role in catalysis by stabilizing the transition state and polarizing the carbonyl group of the substrate. The Zn²⁺ ion is coordinated in a distorted tetrahedral geometry by three protein ligands and a water __________ _____ ______ ___ ______ ______ ___ ______ _____ ______ ___ ________.
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