1SJA:
reference: Evolution of enzymatic activity in the enolase superfamily: structural studies of the promiscuous o-succinylbenzoate synthase from Amycolatopsis., Thoden JB, Taylor Ringia EA, Garrett JB, Gerlt JA, Holden HM, Rayment I, Biochemistry 2004 May 18;43(19):5716-27. PMID: 15134446

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