4AOY:
reference: The complex structures of isocitrate dehydrogenase from Clostridium thermocellum and Desulfotalea psychrophila suggest a new active site locking mechanism., Leiros HK, Fedoy AE, Leiros I, Steen IH, FEBS Open Bio. 2012 Jul 7;2:159-72. doi: 10.1016/j.fob.2012.06.003. Print 2012. PMID: 23650595

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