4Z6B:
reference: Conservative Tryptophan Mutants of the Protein Tyrosine Phosphatase YopH Exhibit Impaired WPD-Loop Function and Crystallize with Divanadate Esters in Their Active Sites., Moise G, Gallup NM, Alexandrova AN, Hengge AC, Johnson SJ, Biochemistry. 2015 Oct 27;54(42):6490-500. doi: 10.1021/acs.biochem.5b00496. Epub, 2015 Oct 14. PMID: 26445170

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