4XIY:
reference: Cofactor specificity motifs and the induced fit mechanism in Class I ketol-acid reductoisomerases., Cahn JK, Brinkmann-Chen S, Spatzal T, Wiig JA, Buller AR, Einsle O, Hu Y, Ribbe MW, Arnold FH, Biochem J. 2015 Apr 7. PMID: 25849365

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