2UYX:
reference: Asp-120 locates Zn2 for optimal metallo-beta-lactamase activity., Llarrull LI, Fabiane SM, Kowalski JM, Bennett B, Sutton BJ, Vila AJ, J Biol Chem. 2007 Jun 22;282(25):18276-85. Epub 2007 Apr 10. PMID: 17426028

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