2WN5:
reference: Structural basis for substrate recognition in the enzymatic component of ADP-ribosyltransferase toxin CDTa from Clostridium difficile., Sundriyal A, Roberts AK, Shone CC, Acharya KR, J Biol Chem. 2009 Aug 19. PMID: 19692332

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