Cited by 596Cell death mechanisms and regulationMitochondrial Function and PathologyAutophagy in Disease and Therapy

A Unified Model of Mammalian BCL-2 Protein Family Interactions at the Mitochondria

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Llambi, Fabien, Moldoveanu, Tudor, Tait, Stephen W.G., Bouchier-Hayes, Lisa, Temirov, Jamshid, McCormick, Laura L., Dillon, Christopher P., Green, Douglas R.·2011·Molecular Cell

Abstract

During apoptosis, the BCL-2 protein family controls mitochondrial outer membrane permeabilization (MOMP), but the dynamics of this regulation remain controversial. We employed chimeric proteins composed of exogenous BH3 domains inserted into a tBID backbone that can activate the proapoptotic effectors BAX and BAK to permeabilize membranes without being universally sequestered by all antiapoptotic BCL-2 proteins. We thus identified two "modes" whereby prosurvival BCL-2 proteins can block MOMP, by sequestering direct-activator BH3-only proteins ("MODE 1") or by binding active BAX and BAK ("MODE 2"). Notably, we found that MODE 1 sequestration is less efficient and more easily derepressed to promote MOMP than MODE 2. Further, MODE 2 sequestration prevents mitochondrial fusion. We provide a unified model of BCL-2 family function that helps to explain otherwise paradoxical observations relating to MOMP, apoptosis, and mitochondrial dynamics.

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Crossref · 10.1016/j.molcel.2011.10.001

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  • Most pro-survival BCL2 family members inhibit BAX and BAK by preventing their oligomerization and pore-forming activity either directly, upon physical sequestration at the OMM, or indirectly, following the sequestration of BH3-only activators.

    “Thus, most pro-survival BCL2 family members inhibit BAX and BAK by preventing their oligomerization and pore-forming activity either directly, upon physical sequestration at the OMM, or indirectly, following the sequestration of BH3-only activators [29, 64, 79, 110].”

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Authors
Llambi, F., Moldoveanu, T., Tait, S. W. G., Bouchier-Hayes, L., Temirov, J., McCormick, L. L., Dillon, C. P., & Green, D. R.
Affiliations
St. Jude Children's Research Hospital (US)
Corresponding author
Green, Douglas R.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2011-11
Volume
44
Issue
4
Pages
517-531
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2027482010
Cited by
596
References
47
Citations by year
2026: 16 · 2025: 20 · 2024: 27 · 2023: 32 · 2022: 34 · 2021: 37 · 2020: 48 · 2019: 42 · 2018: 38 · 2017: 52 · 2016: 61 · 2015: 46 · 2014: 50 · 2013: 64 · 2012: 28
FWCI
18.45
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (submittedVersion)
Funders
  • Abbott Laboratories
  • American Lebanese Syrian Associated Charities
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM096208, R37GM052735, GM 096208, R01GM052735, GM-52735)
  • National Institute of Allergy and Infectious Diseases (R01AI040646, AI40646)
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
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
Bcl-2 family proteins, mitochondrial outer membrane permeabilization, apoptosis, BH3-only proteins, Bax, Bak, tBid, fusion protein, mitochondrial fusion, mitochondrial dynamics
MeSH terms
Amino Acid Sequence, Animals, Gene Expression Regulation, HeLa Cells, Humans, Mammals, Mitochondria, Liver, Permeability, Protein Binding, Recombinant Fusion Proteins, Transfection, Signal Transduction, Sequence Alignment, Apoptosis, Mice, Knockout, Cytochromes c, bcl-2 Homologous Antagonist-Killer Protein, Apoptosis Regulatory Proteins, bcl-X Protein, BH3 Interacting Domain Death Agonist Protein, bcl-2-Associated X Protein, Mitochondrial Membranes, Mice, Molecular Sequence Annotation

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