3U9S:
reference: An unanticipated architecture of the 750-kDa alpha6beta6 holoenzyme of 3-methylcrotonyl-CoA carboxylase., Huang CS, Ge P, Zhou ZH, Tong L, Nature. 2011 Dec 11;481(7380):219-23. doi: 10.1038/nature10691. PMID: 22158123

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