Bax domain swapped dimer induced by octylmaltoside

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 

wwPDB Validation   3D Report Full Report

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Bax Crystal Structures Reveal How Bh3 Domains Activate Bax and Nucleate its Oligomerization to Induce Apoptosis.

Czabotar, P.E.Westphal, D.Dewson, G.Ma, S.Hockings, C.Fairlie, W.D.Lee, E.F.Yao, S.Robin, A.Y.Smith, B.J.Huang, D.C.Kluck, R.M.Adams, J.M.Colman, P.M.

(2013) Cell 152: 519

  • DOI: https://doi.org/10.1016/j.cell.2012.12.031
  • Primary Citation of Related Structures:  
    4BD2, 4BD6, 4BD7, 4BD8, 4BDU

  • PubMed Abstract: 

    In stressed cells, apoptosis ensues when Bcl-2 family members Bax or Bak oligomerize and permeabilize the mitochondrial outer membrane. Certain BH3-only relatives can directly activate them to mediate this pivotal, poorly understood step. To clarify the conformational changes that induce Bax oligomerization, we determined crystal structures of BaxΔC21 treated with detergents and BH3 peptides. The peptides bound the Bax canonical surface groove but, unlike their complexes with prosurvival relatives, dissociated Bax into two domains. The structures define the sequence signature of activator BH3 domains and reveal how they can activate Bax via its groove by favoring release of its BH3 domain. Furthermore, Bax helices α2-α5 alone adopted a symmetric homodimer structure, supporting the proposal that two Bax molecules insert their BH3 domain into each other's surface groove to nucleate oligomerization. A planar lipophilic surface on this homodimer may engage the membrane. Our results thus define critical Bax transitions toward apoptosis.

  • Organizational Affiliation

    The Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia. czabotar@wehi.edu.au

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
174Homo sapiensMutation(s): 2 
UniProt & NIH Common Fund Data Resources
Find proteins for Q07812 (Homo sapiens)
Explore Q07812 
Go to UniProtKB:  Q07812
PHAROS:  Q07812
GTEx:  ENSG00000087088 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07812
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.237α = 90
b = 142.237β = 90
c = 86.775γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-13
    Type: Initial release