2VTY

Vaccinia virus anti-apoptotic F1L is a novel Bcl-2-like domain swapped dimer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Vaccinia Virus Anti-Apoptotic F1L is a Novel Bcl-2-Like Domain-Swapped Dimer that Binds a Highly Selective Subset of Bh3-Containing Death Ligands.

Kvansakul, M.Yang, H.Fairlie, W.D.Czabotar, P.E.Fischer, S.F.Perugini, M.A.Huang, D.C.S.Colman, P.M.

(2008) Cell Death Differ. 15: 1564

  • DOI: 10.1038/cdd.2008.83

  • PubMed Abstract: 
  • Apoptosis is an important part of the host's defense mechanism for eliminating invading pathogens. Some viruses express proteins homologous in sequence and function to mammalian pro-survival Bcl-2 proteins. Anti-apoptotic F1L expressed by vaccinia vi ...

    Apoptosis is an important part of the host's defense mechanism for eliminating invading pathogens. Some viruses express proteins homologous in sequence and function to mammalian pro-survival Bcl-2 proteins. Anti-apoptotic F1L expressed by vaccinia virus is essential for survival of infected cells, but it bears no discernable sequence homology to proteins other than its immediate orthologues in related pox viruses. Here we report that the crystal structure of F1L reveals a Bcl-2-like fold with an unusual N-terminal extension. The protein forms a novel domain-swapped dimer in which the alpha1 helix is the exchanged domain. Binding studies reveal an atypical BH3-binding profile, with sub-micromolar affinity only for the BH3 peptide of pro-apoptotic Bim and low micromolar affinity for the BH3 peptides of Bak and Bax. This binding interaction is sensitive to F1L mutations within the predicted canonical BH3-binding groove, suggesting parallels between how vaccinia virus F1L and myxoma virus M11L bind BH3 domains. Structural comparison of F1L with other Bcl-2 family members reveals a novel sequence signature that redefines the BH4 domain as a structural motif present in both pro- and anti-apoptotic Bcl-2 members, including viral Bcl-2-like proteins.


    Organizational Affiliation

    The Walter and Eliza Hall Institute of Medical Research, 1G Poyal Parade, Parkville, Victoria 3050, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN F1
A
182Vaccinia virus (strain Ankara)Mutation(s): 0 
Find proteins for O57173 (Vaccinia virus (strain Ankara))
Go to UniProtKB:  O57173
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.192 
  • Space Group: P 2 3
Unit Cell:
Length (Å)Angle (°)
a = 88.261α = 90.00
b = 88.261β = 90.00
c = 88.261γ = 90.00
Software Package:
Software NamePurpose
SHELXphasing
HKL-2000data reduction
HKL-2000data scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-24
    Type: Initial release
  • Version 1.1: 2012-01-18
    Type: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Version format compliance