3MB2:
reference: Kinetic and structural characterization of a heterohexamer 4-oxalocrotonate tautomerase from Chloroflexus aurantiacus J-10-fl: implications for functional and structural diversity in the tautomerase superfamily ., Burks EA, Fleming CD, Mesecar AD, Whitman CP, Pegan SD, Biochemistry. 2010 Jun 22;49(24):5016-27. PMID: 20465238

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