3H9G:
reference: How the MccB bacterial ancestor of ubiquitin E1 initiates biosynthesis of the microcin C7 antibiotic., Regni CA, Roush RF, Miller DJ, Nourse A, Walsh CT, Schulman BA, EMBO J. 2009 Jun 4. PMID: 19494832

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