4ZIH

Crystal Structure of core/latch dimer of Bax in complex with BimBH3mini

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Crystal structure of Bax bound to the BH3 peptide of Bim identifies important contacts for interaction.

Robin, A.Y., Krishna Kumar, K., Westphal, D., Wardak, A.Z., Thompson, G.V., Dewson, G., Colman, P.M., Czabotar, P.E.

(2015) Cell Death Dis 6: e1809-e1809

  • DOI: 10.1038/cddis.2015.141
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • The BH3-only protein Bim is a potent direct activator of the proapoptotic effector protein Bax, but the structural basis for its activity has remained poorly defined. Here we describe the crystal structure of the BimBH3 peptide bound to BaxΔC26 and s ...

    The BH3-only protein Bim is a potent direct activator of the proapoptotic effector protein Bax, but the structural basis for its activity has remained poorly defined. Here we describe the crystal structure of the BimBH3 peptide bound to BaxΔC26 and structure-based mutagenesis studies. Similar to BidBH3, the BimBH3 peptide binds into the cognate surface groove of Bax using the conserved hydrophobic BH3 residues h1-h4. However, the structure and mutagenesis data show that Bim is less reliant compared with Bid on its 'h0' residues for activating Bax and that a single amino-acid difference between Bim and Bid encodes a fivefold difference in Bax-binding potency. Similar to the structures of BidBH3 and BaxBH3 bound to BaxΔC21, the structure of the BimBH3 complex with BaxΔC displays a cavity surrounded by Bax α1, α2, α5 and α8. Our results are consistent with a model in which binding of an activator BH3 domain to the Bax groove initiates separation of its core (α2-α5) and latch (α6-α8) domains, enabling its subsequent dimerisation and the permeabilisation of the mitochondrial outer membrane.

    Organizational Affiliation: 

    1] The Walter and Eliza Hall Institute of Medical Research, Melbourne, VIC, Australia [2] Department of Medical Biology, The University of Melbourne, Melbourne, VIC, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Apoptosis regulator BAX
A
167Homo sapiensMutation(s): 2 
Gene Names: BAX (BCL2L4)
Find proteins for Q07812 (Homo sapiens)
Go to Gene View: BAX
Go to UniProtKB:  Q07812
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Bcl-2-like protein 11
B
20Homo sapiensMutation(s): 0 
Gene Names: BCL2L11 (BIM)
Find proteins for O43521 (Homo sapiens)
Go to Gene View: BCL2L11
Go to UniProtKB:  O43521
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.186 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 95.730α = 90.00
b = 95.730β = 90.00
c = 37.100γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XSCALEdata scaling
PHASERphasing
XDSdata reduction
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (Australia)AustraliaProjects Grant 1079706
National Health and Medical Research Council (Australia)AustraliaProjects Grant 1059331
National Health and Medical Research Council (Australia)AustraliaProjects Grant 1023055
National Health and Medical Research Council (Australia)AustraliaProgram Grant 1016701

Revision History 

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2017-09-20
    Type: Author supporting evidence, Data collection, Derived calculations, Source and taxonomy