4X2Z

Structural view and substrate specificity of papain-like protease from Avian Infectious Bronchitis Virus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 

wwPDB Validation   3D Report Full Report


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Literature

Structural View and Substrate Specificity of Papain-like Protease from Avian Infectious Bronchitis Virus.

Kong, L.Shaw, N.Yan, L.Lou, Z.Rao, Z.

(2015) J Biol Chem 290: 7160-7168

  • DOI: 10.1074/jbc.M114.628636
  • Primary Citation of Related Structures:  
    4X2Z

  • PubMed Abstract: 
  • Papain-like protease (PLpro) of coronaviruses (CoVs) carries out proteolytic maturation of non-structural proteins that play a role in replication of the virus and performs deubiquitination of host cell factors to scuttle antiviral responses. Avian infectious bronchitis virus (IBV), the causative agent of bronchitis in chicken that results in huge economic losses every year in the poultry industry globally, encodes a PLpro ...

    Papain-like protease (PLpro) of coronaviruses (CoVs) carries out proteolytic maturation of non-structural proteins that play a role in replication of the virus and performs deubiquitination of host cell factors to scuttle antiviral responses. Avian infectious bronchitis virus (IBV), the causative agent of bronchitis in chicken that results in huge economic losses every year in the poultry industry globally, encodes a PLpro. The substrate specificities of this PLpro are not clearly understood. Here, we show that IBV PLpro can degrade Lys(48)- and Lys(63)-linked polyubiquitin chains to monoubiquitin but not linear polyubiquitin. To explain the substrate specificities, we have solved the crystal structure of PLpro from IBV at 2.15-Å resolution. The overall structure is reminiscent of the structure of severe acute respiratory syndrome CoV PLpro. However, unlike the severe acute respiratory syndrome CoV PLpro that lacks blocking loop (BL) 1 of deubiquitinating enzymes, the IBV PLpro has a short BL1-like loop. Access to a conserved catalytic triad consisting of Cys(101), His(264), and Asp(275) is regulated by the flexible BL2. A model of ubiquitin-bound IBV CoV PLpro brings out key differences in substrate binding sites of PLpros. In particular, P3 and P4 subsites as well as residues interacting with the β-barrel of ubiquitin are different, suggesting different catalytic efficiencies and substrate specificities. We show that IBV PLpro cleaves peptide substrates KKAG-7-amino-4-methylcoumarin and LRGG-7-amino-4-methylcoumarin with different catalytic efficiencies. These results demonstrate that substrate specificities of IBV PLpro are different from other PLpros and that IBV PLpro might target different ubiquitinated host factors to aid the propagation of the virus.


    Organizational Affiliation

    From the Laboratory of Structural Biology, School of Medicine, Tsinghua University, Beijing 100084, China, College of Life Sciences, Nankai University, Tianjin 300071, China, and National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Science, Beijing 100101, China raozh@xtal.tsinghua.edu.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Nonstructural protein 3A322Avian infectious bronchitis virus (strain Beaudette)Mutation(s): 0 
Gene Names: rep1a-1b
EC: 3.4.22 (PDB Primary Data), 2.7.7.48 (UniProt), 3.6.4.12 (UniProt), 3.6.4.13 (UniProt), 3.1.13 (UniProt), 3.1 (UniProt), 2.1.1 (UniProt)
UniProt
Find proteins for P0C6Y1 (Avian infectious bronchitis virus (strain Beaudette))
Explore P0C6Y1 
Go to UniProtKB:  P0C6Y1
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.312α = 90
b = 95.123β = 90
c = 118.358γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Major Project (973 Program)China2014CB542800 and 2013CB911100
National Natural Science Foundation of ChinaChina81330036 and 81322023
Tsinghua University Initiative Scientific Research ProgramChina20141080146

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-28
    Type: Initial release
  • Version 1.1: 2015-04-01
    Changes: Database references, Derived calculations