1VST:
reference: Structural and Kinetic Studies of the Allosteric Transition in Sulfolobus solfataricus Uracil Phosphoribosyltransferase: Permanent Activation by Engineering of the C-Terminus., Christoffersen S, Kadziola A, Johansson E, Rasmussen M, Willemoes M, Jensen KF, J Mol Biol. 2009 Aug 14. PMID: 19683539

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