Cited by 162Cell death mechanisms and regulationMitochondrial Function and PathologyEnzyme Structure and Function

Bak Core and Latch Domains Separate during Activation, and Freed Core Domains Form Symmetric Homodimers

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Brouwer, Jason M., Westphal, Dana, Dewson, Grant, Robin, Adeline Y., Uren, Rachel T., Bartolo, Ray, Thompson, Geoff V., Colman, Peter M. +2 more·2014·Molecular Cell

Abstract

Apoptotic stimuli activate and oligomerize the proapoptotic proteins Bak and Bax, resulting in mitochondrial outer-membrane permeabilization and subsequent cell death. This activation can occur when certain BH3-only proteins interact directly with Bak and Bax. Recently published crystal structures reveal that Bax separates into core and latch domains in response to BH3 peptides. The distinguishing characteristics of BH3 peptides capable of directly activating Bax were also elucidated. Here we identify specific BH3 peptides capable of "unlatching" Bak and describe structural insights into Bak activation and oligomerization. Crystal structures and crosslinking experiments demonstrate that Bak undergoes a conformational change similar to that of Bax upon activation. A structure of the Bak core domain dimer provides a high-resolution image of this key intermediate in the pore-forming oligomer. Our results confirm an analogous mechanism for activation and dimerization of Bak and Bax in response to certain BH3 peptides.

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Crossref · 10.1016/j.molcel.2014.07.016

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  • Activated BAX and BAK form homodimers (also heterodimers in specific settings), resulting in the release of BH3-only proteins and further dimer-by-dimer oligomerization.

    “The current view is that activated BAX and BAK form homodimers (also heterodimers in specific settings), resulting in the release of BH3-only proteins and further dimer-by-dimer oligomerization [76–83].”

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Authors
Brouwer, J. M., Westphal, D., Dewson, G., Robin, A. Y., Uren, R. T., Bartolo, R., Thompson, G. V., Colman, P. M., Kluck, R. M., & Czabotar, P. E.
Affiliations
  • The University of Melbourne (AU)
  • Walter and Eliza Hall Institute of Medical Research (AU)
Corresponding author
  • Kluck, Ruth M.
  • Czabotar, Peter E.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2014-09
Volume
55
Issue
6
Pages
938-946
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2027069808
Cited by
161
References
41
Citations by year
2026: 6 · 2025: 7 · 2024: 10 · 2023: 14 · 2022: 15 · 2021: 16 · 2020: 16 · 2019: 8 · 2018: 13 · 2017: 16 · 2016: 20 · 2015: 16 · 2014: 4
FWCI
7.66
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
Bak, Bax, BH3-only proteins, BH3 peptides, protein activation, homodimerization, mitochondrial outer membrane permeabilization, apoptosis, conformational change, oligomerization
MeSH terms
Animals, Crystallography, Cysteine, Humans, Mitochondria, Models, Molecular, Peptide Fragments, Protein Conformation, Proto-Oncogene Proteins, Protein Structure, Secondary, Protein Structure, Tertiary, bcl-2 Homologous Antagonist-Killer Protein, bcl-2-Associated X Protein, Mice, Protein Multimerization

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