3PL7

Crystal structure of Bcl-xL in complex with the BaxBH3 domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.613 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mutation to Bax beyond the BH3 domain disrupts interactions with pro-survival proteins and promotes apoptosis

Czabotar, P.E.Lee, E.F.Thompson, G.V.Wardak, A.Z.Fairlie, W.D.Colman, P.M.

(2011) J.Biol.Chem. 286: 7123-7131

  • DOI: 10.1074/jbc.M110.161281
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Pro-survival members of the Bcl-2 family of proteins restrain the pro-apoptotic activity of Bax, either directly through interactions with Bax or indirectly by sequestration of activator BH3-only proteins, or both. Mutations in Bax that promote apopt ...

    Pro-survival members of the Bcl-2 family of proteins restrain the pro-apoptotic activity of Bax, either directly through interactions with Bax or indirectly by sequestration of activator BH3-only proteins, or both. Mutations in Bax that promote apoptosis can provide insight into how Bax is regulated. Here, we describe crystal structures of the pro-survival proteins Mcl-1 and Bcl-x(L) in complex with a 34-mer peptide from Bax that encompasses its BH3 domain. These structures reveal canonical interactions between four signature hydrophobic amino acids from the BaxBH3 domain and the BH3-binding groove of the pro-survival proteins. In both structures, Met-74 from the Bax peptide engages with the BH3-binding groove in a fifth hydrophobic interaction. Various Bax Met-74 mutants disrupt interactions between Bax and all pro-survival proteins, but these Bax mutants retain pro-apoptotic activity. Bax/Bak-deficient mouse embryonic fibroblast cells reconstituted with several Bax Met-74 mutants are more sensitive to the BH3 mimetic compound ABT-737 as compared with cells expressing wild-type Bax. Furthermore, the cells expressing Bax Met-74 mutants are less viable in colony assays even in the absence of an external apoptotic stimulus. These results support a model in which direct restraint of Bax by pro-survival Bcl-2 proteins is a barrier to apoptosis.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bcl-2-like protein 1
A, B
181Homo sapiensMutation(s): 0 
Gene Names: BCL2L1 (BCL2L, BCLX)
Find proteins for Q07817 (Homo sapiens)
Go to Gene View: BCL2L1
Go to UniProtKB:  Q07817
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Apoptosis regulator BAX
C
34Homo sapiensMutation(s): 0 
Gene Names: BAX (BCL2L4)
Find proteins for Q07812 (Homo sapiens)
Go to Gene View: BAX
Go to UniProtKB:  Q07812
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.613 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.186 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 70.246α = 90.00
b = 99.050β = 90.00
c = 113.143γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
Blu-Icedata collection
PHASERphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-01-22
    Type: Database references