3I7U:
reference: Free and ATP-bound structures of Ap4A hydrolase from Aquifex aeolicus V5., Jeyakanthan J, Kanaujia SP, Nishida Y, Nakagawa N, Praveen S, Shinkai A, Kuramitsu S, Yokoyama S, Sekar K, Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):116-24. Epub 2010, Jan 22. PMID: 20124691

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