1PIX:
reference: Crystal structure of the carboxyltransferase subunit of the bacterial sodium ion pump glutaconyl-coenzyme A decarboxylase., Wendt KS, Schall I, Huber R, Buckel W, Jacob U, EMBO J 2003 Jul 15;22(14):3493-502. PMID: 12853465

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