4IZK:
reference: Crystal structures of Yellowtail ascites virus VP4 protease: trapping an internal cleavage site trans acyl-enzyme complex in a native Ser/Lys dyad active site., Chung IY, Paetzel M, J Biol Chem. 2013 Mar 19. PMID: 23511637

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