5UM6:
reference: Domain alternation and active site remodeling are conserved structural features of ubiquitin E1., Lv Z, Yuan L, Atkison JH, Aldana-Masangkay G, Chen Y, Olsen SK, J Biol Chem. 2017 Jul 21;292(29):12089-12099. doi: 10.1074/jbc.M117.787622. Epub , 2017 Jun 1. PMID: 28572513

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