3HQO:
reference: The allosteric mechanism of pryuvate kinase from Leishmania mexicana: a rock and lock model., Morgan HP, McNae IW, Nowicki MW, Hannaert V, Michels PA, Fothergill-Gilmore LA, Walkinshaw MD, J Biol Chem. 2010 Feb 1. PMID: 20123988

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