6GX4:
reference: The Molybdenum Storage Protein: A soluble ATP hydrolysis dependent molybdate pump., Poppe J, Brunle S, Hail R, Wiesemann K, Schneider K, Ermler U, FEBS J. 2018 Oct 27. doi: 10.1111/febs.14684. PMID: 30367742

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