2ZUA:
reference: Molecular mechanism of distinct salt-dependent enzyme activity of two halophilic nucleoside diphosphate kinases., Yamamura A, Ichimura T, Kamekura M, Mizuki T, Usami R, Makino T, Ohtsuka J, Miyazono K, Okai M, Nagata K, Tanokura M, Biophys J. 2009 Jun 3;96(11):4692-700. PMID: 19486691

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).