4F6H:
reference: Mutagenesis of zinc ligand residue Cys221 reveals plasticity in the IMP-1 metallo-beta-lactamase active site., Horton LB, Shanker S, Mikulski R, Brown NG, Phillips KJ, Lykissa E, Venkataram Prasad BV, Palzkill T, Antimicrob Agents Chemother. 2012 Nov;56(11):5667-77. doi: 10.1128/AAC.01276-12. , Epub 2012 Aug 20. PMID: 22908171

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