5IU6:
reference: Crystal structure of Escherichia coli purine nucleoside phosphorylase in complex with 7-deazahypoxanthine., Timofeev VI, Zhukhlistova NE, Abramchik YA, Fateev II, Kostromina MA, Muravieva TI, Esipov RS, Kuranova IP, Acta Crystallogr F Struct Biol Commun. 2018 Jun 1;74(Pt 6):355-362. doi:, 10.1107/S2053230X18006337. Epub 2018 May 23. PMID: 29870020

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