3VKJ:
reference: Substrate-Induced Change in the Quaternary Structure of Type 2 Isopentenyl Diphosphate Isomerase from Sulfolobus shibatae., Nakatani H, Goda S, Unno H, Nagai T, Yoshimura T, Hemmi H, J Bacteriol. 2012 Jun;194(12):3216-24. Epub 2012 Apr 13. PMID: 22505674

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