3VR0:
reference: An archaeal homolog of proteasome assembly factor functions as a proteasome activator., Kumoi K, Satoh T, Murata K, Hiromoto T, Mizushima T, Kamiya Y, Noda M, Uchiyama S, Yagi H, Kato K, PLoS One. 2013;8(3):e60294. doi: 10.1371/journal.pone.0060294. Epub 2013 Mar 21. PMID: 23555947

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