Sandbox 122

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New Delhi Metallo-Beta-Lactamase

Zn1, coordinated by three histidine residues, acts as a major constituent of oxyanion hole to stabilize tetrahedral intermediate. It also acts as a Lewis acid for interaction with lactam carbonyl in Michaelis complex. Zn1 also acts to suppress the pka of the hydrolytic water to (~5-6) to facilitate it's nucleophillic role.

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