4AXV:
reference: MpaA is a murein-tripeptide-specific zinc carboxypeptidase that functions as part of a catabolic pathway for peptidoglycan derived peptides in gamma-proteobacteria., Maqbool A, Herve M, Mengin-Lecreulx D, Wilkinson AJ, Thomas GH, Biochem J. 2012 Sep 12. PMID: 22970852

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