4AUQ:
reference: BIRC7-E2 ubiquitin conjugate structure reveals the mechanism of ubiquitin transfer by a RING dimer., Dou H, Buetow L, Sibbet GJ, Cameron K, Huang DT, Nat Struct Mol Biol. 2012 Sep;19(9):876-83. doi: 10.1038/nsmb.2379. Epub 2012 Aug, 14. PMID: 22902369

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