1IU8:
reference: The X-ray crystal structure of pyrrolidone-carboxylate peptidase from hyperthermophilic archaea Pyrococcus horikoshii., Sokabe M, Kawamura T, Sakai N, Yao M, Watanabe N, Tanaka I, J Struct Funct Genomics 2002;2(3):145-54. PMID: 12836705

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