6GOX:
reference: The C-terminal tail of the bacterial translocation ATPase SecA modulates its activity., Jamshad M, Knowles TJ, White SA, Ward DG, Mohammed F, Rahman KF, Wynne M, Hughes GW, Kramer G, Bukau B, Huber D, Elife. 2019 Jun 27;8. pii: 48385. doi: 10.7554/eLife.48385. PMID: 31246174

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