4JYB:
reference: A switch III motif relays signaling between a B enzyme and its G-protein chaperone., Lofgren M, Padovani D, Koutmos M, Banerjee R, Nat Chem Biol. 2013 Jul 21. doi: 10.1038/nchembio.1298. PMID: 23873214

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