1VGP:
reference: Crystal Structures of Two Isozymes of Citrate Synthase from Sulfolobus tokodaii Strain 7., Murakami M, Kouyama T, Biochem Res Int. 2016;2016:7560919. doi: 10.1155/2016/7560919. Epub 2016 Aug 30. PMID: 27656296

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