2GJ8:
reference: Dimerisation-dependent GTPase reaction of MnmE: how potassium acts as GTPase-activating element., Scrima A, Wittinghofer A, EMBO J. 2006 Jun 21;25(12):2940-51. Epub 2006 Jun 8. PMID: 16763562

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