2O42

Crystal Structure of M11L, Bcl-2 homolog from myxoma virus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.251 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of M11L: A myxoma virus structural homolog of the apoptosis inhibitor, Bcl-2.

Douglas, A.E.Corbett, K.D.Berger, J.M.McFadden, G.Handel, T.M.

(2007) Protein Sci 16: 695-703

  • DOI: https://doi.org/10.1110/ps.062720107
  • Primary Citation of Related Structures:  
    2O42

  • PubMed Abstract: 

    Apoptosis of virally infected cells is an innate host mechanism used to prevent viral spread. However, viruses have evolved a number of proteins that function to modulate the apoptotic cascades and thereby favor productive viral replication. One such antiapoptotic protein, myxoma virus M11L, has been shown to inhibit mitochondrial-dependent apoptosis by binding to and blocking the two executioner proteins Bak and Bax. Since M11L has no obvious sequence homology with Bcl-2 or Bcl-x(L), the normal cellular inhibitors for Bak and Bax, and the structure of M11L has not been solved, the mode of binding to Bak and Bax is not known. In order to understand how M11L functions, the crystal structure of M11L was solved to 2.91 A. Despite the lack of sequence similarity, M11L is a structural homolog of Bcl-2. Studies using a peptide derived from Bak indicate that M11L binds to Bak with a similar affinity (4.9 +/- 0.3 microM) to the published binding affinities of Bcl-2 and Bcl-x(L) to the same peptide (12.7 microM and 0.5 microM, respectively), indicating that M11L inhibits apoptosis by mimicking and competing with host proteins for the binding of Bak and Bax. The structure provides important insight into how myxoma virus and other poxviruses facilitate viral dissemination by inhibiting mitochondrial dependent apoptosis.


  • Organizational Affiliation

    Department of Molecular and Cell Biology, University of California-Berkeley, Berkeley, California 94720, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
M11L protein
A, B
144Myxoma virusMutation(s): 5 
Gene Names: M11Lm011L
UniProt
Find proteins for Q85295 (Myxoma virus)
Explore Q85295 
Go to UniProtKB:  Q85295
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ85295
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.91 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.251 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.151α = 90
b = 73.151β = 90
c = 186.875γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-03-06
    Type: Initial release
  • Version 1.1: 2007-11-14
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references, Derived calculations