_EC 3.4.21.115 Infectious pancreatic necrosis birnavirus Vp4 peptidase. 3 PDB entries  
EC 3.-.-.- Hydrolases. [22,196 PDB entries]
EC 3.4.-.- Acting on peptide bonds (peptide hydrolases). [7,186 PDB entries]
EC 3.4.21.- Serine endopeptidases. [2,621 PDB entries]
EC 3.4.21.115 Infectious pancreatic necrosis birnavirus Vp4 peptidase. [3 PDB entries]    
3r0b

Reaction: Cleaves the (Ser/Thr)-Xaa-Ala-|-(Ser/Ala)-Gly motif in the polyprotein NH(2)-pVP2-VP4-VP3-Cooh of infectious pancreatic necrosis virus at the pVP2-VP4 and VP4-VP3 junctions.
Other name(s): Infectious pancreatic necrosis virus protease. Ipnv Vp4 peptidase. Ipnv Vp4 protease. Ns protease. NS-associated protease. Vp4 protease.
Comments: Infectious pancreatic necrosis virus (IPNV) is a birnavirus that causes an acute, contagious disease in young salmonid fish. As with most viruses that infect eukaryotic cells, the proteolytic processing of viral precursor proteins is a crucial step in the life cycle of this virus. pVP2 is converted into VP2 by cleavage near the carboxy end of pVP2; this cleavage is most likely due to host-cell proteases rather than VP4. Differs from most serine peptidases in not having the catalytic triad Ser-His-Asp.
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There are 3 PDB entries in enzyme class E.C.3.4.21.115

  PDB code Protein
3r0b
Crystal structure of yellowtail ascites virus vp4 protease w wild-type active site reveals acyl-enzyme complexes and pro complexes.
Source: Yellowtail ascites virus. Organism_taxid: 360000. Strain: y-6. Gene: viral protein 4 (vp4). Expressed in: escherichia coli. Expression_system_taxid: 469008.
Chains: A, B, C, D, E (203 residues) CATH domain: Unassigned
3rbp
Crystal structure of yellowtail ascites virus vp4 protease a mutant (k674a) reveals both an acyl-enzyme complex and an e active site.
Source: Yellowtail ascites virus. Organism_taxid: 360000. Strain: y-6. Gene: vp4. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chains: A, B (202 residues) CATH domain: Unassigned
4hhc
Crystal structure of yellowtail ascites virus vp4 protease a mutant (k674a) reveals both an acyl-enzyme complex and an e active site.
Source: Yellowtail ascites virus. Organism_taxid: 360000. Strain: y-6. Gene: vp4. Expressed in: escherichia coli. Expression_system_taxid: 562.
Chains: A, B (202 residues) CATH domain: Unassigned