5F6U:
reference: Insights Into the Allosteric Inhibition of the SUMO E2 Enzyme Ubc9., Hewitt WM, Lountos GT, Zlotkowski K, Dahlhauser SD, Saunders LB, Needle D, Tropea JE, Zhan C, Wei G, Ma B, Nussinov R, Waugh DS, Schneekloth JS Jr, Angew Chem Int Ed Engl. 2016 May 4;55(19):5703-7. doi: 10.1002/anie.201511351., Epub 2016 Apr 1. PMID: 27038327

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