1OEN:
reference: Crystal structure of Escherichia coli phosphoenolpyruvate carboxykinase: a new structural family with the P-loop nucleoside triphosphate hydrolase fold., Matte A, Goldie H, Sweet RM, Delbaere LT, J Mol Biol 1996 Feb 16;256(1):126-43. PMID: 8609605

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