3KTA:
reference: Structural basis for adenylate kinase activity in ABC ATPases., Lammens A, Hopfner KP, J Mol Biol. 2010 Aug 13;401(2):265-73. Epub 2010 Jun 19. PMID: 20600125

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