4YBO:
reference: An active site-tail interaction in the structure of hexahistidine-tagged Thermoplasma acidophilum citrate synthase., Murphy JR, Donini S, Kappock TJ, Acta Crystallogr F Struct Biol Commun. 2015 Oct;71(Pt 10):1292-9. doi:, 10.1107/S2053230X15015939. Epub 2015 Sep 23. PMID: 26457521

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