4J5H:
reference: A phenylalanine clamp controls substrate specificity in the quorum-quenching metallo-gamma-lactonase from Bacillus thuringiensis., Liu CF, Liu D, Momb J, Thomas PW, Lajoie A, Petsko GA, Fast W, Ringe D, Biochemistry. 2013 Mar 5;52(9):1603-10. doi: 10.1021/bi400050j. Epub 2013 Feb 20. PMID: 23387521

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