3WS5:
reference: Structure of a highly acidic beta-lactamase from the moderate halophile Chromohalobacter sp. 560 and the discovery of a Cs(+)-selective binding site., Arai S, Yonezawa Y, Okazaki N, Matsumoto F, Shibazaki C, Shimizu R, Yamada M, Adachi M, Tamada T, Kawamoto M, Tokunaga H, Ishibashi M, Blaber M, Tokunaga M, Kuroki R, Acta Crystallogr D Biol Crystallogr. 2015 Mar 1;71(Pt 3):541-54. doi:, 10.1107/S1399004714027734. Epub 2015 Feb 26. PMID: 25760604

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