1YBQ:
reference: Mechanism of the reaction catalyzed by isoaspartyl dipeptidase from Escherichia coli., Marti-Arbona R, Fresquet V, Thoden JB, Davis ML, Holden HM, Raushel FM, Biochemistry 2005 May 17;44(19):7115-24. PMID: 15882050

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