3ULK:
reference: Bacterial and Plant Ketol-Acid Reductoisomerases Have Different Mechanisms of Induced Fit during the Catalytic Cycle., Wong SH, Lonhienne TG, Winzor DJ, Schenk G, Guddat LW, J Mol Biol. 2012 Oct 2. pii: S0022-2836(12)00783-8. doi:, 10.1016/j.jmb.2012.09.018. PMID: 23036858

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