5TZP

Crystal structure of FPV039:Bik BH3 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.148 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of apoptosis inhibition by the fowlpox virus protein FPV039.

Anasir, M.I.Caria, S.Skinner, M.A.Kvansakul, M.

(2017) J Biol Chem 292: 9010-9021

  • DOI: 10.1074/jbc.M116.768879
  • Primary Citation of Related Structures:  
    5TZP, 5TZQ

  • PubMed Abstract: 
  • Programmed cell death or apoptosis of infected host cells is an important defense mechanism in response to viral infections. This process is regulated by proapoptotic and prosurvival members of the B-cell lymphoma 2 (Bcl-2) protein family. To counter premature death of a virus-infected cell, poxviruses use a range of different molecular strategies including the mimicry of prosurvival Bcl-2 proteins ...

    Programmed cell death or apoptosis of infected host cells is an important defense mechanism in response to viral infections. This process is regulated by proapoptotic and prosurvival members of the B-cell lymphoma 2 (Bcl-2) protein family. To counter premature death of a virus-infected cell, poxviruses use a range of different molecular strategies including the mimicry of prosurvival Bcl-2 proteins. One such viral prosurvival protein is the fowlpox virus protein FPV039, which is a potent apoptosis inhibitor, but the precise molecular mechanism by which FPV039 inhibits apoptosis is unknown. To understand how fowlpox virus inhibits apoptosis, we examined FPV039 using isothermal titration calorimetry, small-angle X-ray scattering, and X-ray crystallography. Here, we report that the fowlpox virus prosurvival protein FPV039 promiscuously binds to cellular proapoptotic Bcl-2 and engages all major proapoptotic Bcl-2 proteins. Unlike other identified viral Bcl-2 proteins to date, FPV039 engaged with cellular proapoptotic Bcl-2 with affinities comparable with those of Bcl-2's endogenous cellular counterparts. Structural studies revealed that FPV039 adopts the conserved Bcl-2 fold observed in cellular prosurvival Bcl-2 proteins and closely mimics the structure of the prosurvival Bcl-2 family protein Mcl-1. Our findings suggest that FPV039 is a pan-Bcl-2 protein inhibitor that can engage all host BH3-only proteins, as well as Bcl-2-associated X, apoptosis regulator (Bax) and Bcl-2 antagonist/killer (Bak) proteins to inhibit premature apoptosis of an infected host cell. This work therefore provides a mechanistic platform to better understand FPV039-mediated apoptosis inhibition.


    Organizational Affiliation

    From the Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia and m.kvansakul@latrobe.edu.au.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bcl-2-like protein FPV039 A148Fowlpox virus strain NVSLMutation(s): 0 
Gene Names: FPV039
Find proteins for Q9J5G4 (Fowlpox virus (strain NVSL))
Explore Q9J5G4 
Go to UniProtKB:  Q9J5G4
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Bik B25Gallus gallusMutation(s): 0 
Gene Names: BIK
Find proteins for E1C005 (Gallus gallus)
Explore E1C005 
Go to UniProtKB:  E1C005
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.848α = 90
b = 47.848β = 90
c = 74.303γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaFT130101349

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-03
    Type: Initial release
  • Version 1.1: 2017-06-14
    Changes: Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence