3KJE:
reference: Crystal structure of the ATP-dependent maturation factor of Ni,Fe-containing carbon monoxide dehydrogenases., Jeoung JH, Giese T, Grunwald M, Dobbek H, J Mol Biol. 2010 Mar 5;396(4):1165-79. Epub 2010 Jan 11. PMID: 20064527

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