4QHT:
reference: Unique ATPase site architecture triggers cis-mediated synchronized ATP binding in heptameric AAA+-ATPase domain of flagellar regulatory protein FlrC., Dey S, Biswas M, Sen U, Dasgupta J, J Biol Chem. 2015 Apr 3;290(14):8734-47. doi: 10.1074/jbc.M114.611434. Epub 2015 , Feb 16. PMID: 25688103

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