1RQX:
reference: Structural analysis of 1-aminocyclopropane-1-carboxylate deaminase: observation of an aminyl intermediate and identification of Tyr 294 as the active-site nucleophile., Karthikeyan S, Zhao Z, Kao CL, Zhou Q, Tao Z, Zhang H, Liu HW, Angew Chem Int Ed Engl. 2004 Jun 28;43(26):3425-9. PMID: 15221829

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