1YOV:
reference: Insights into the ubiquitin transfer cascade from the structure of the activating enzyme for NEDD8., Walden H, Podgorski MS, Schulman BA, Nature 2003 Mar 20;422(6929):330-4. PMID: 12646924

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