1Y8X:
reference: Structural basis for recruitment of Ubc12 by an E2 binding domain in NEDD8's E1., Huang DT, Paydar A, Zhuang M, Waddell MB, Holton JM, Schulman BA, Mol Cell. 2005 Feb 4;17(3):341-50. PMID: 15694336

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