4IZK: Crystal Structure Of Yellowtail Ascites Virus Vp4 Protease A Mutant (K674a) Reveals Both An Acyl-Enzyme Complex And An E Active Site
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

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