Cited by 323Cell death mechanisms and regulationMitochondrial Function and PathologyAutophagy in Disease and Therapy

Inactivation of prosurvival Bcl-2 proteins activates Bax/Bak through the outer mitochondrial membrane

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O'Neill, Katelyn L., Huang, Kai, Zhang, Jingjing, Chen, Yi, Luo, Xu·2016·Genes & Development

Abstract

The mechanism of Bax/Bak activation remains a central question in mitochondria-dependent apoptotic signaling. While it is established that all proapoptotic Bcl-2 homology 3 (BH3)-only proteins bind and neutralize the anti-apoptotic Bcl-2 family proteins, how this neutralization leads to Bax/Bak activation has been actively debated. Here, genome editing was used to generate cells deficient for all eight proapoptotic BH3-only proteins (OctaKO) and those that lack the entire Bcl-2 family (Bcl-2 allKO). Although the OctaKO cells were resistant to most apoptotic stimuli tested, they underwent Bax/Bak-dependent and p53/Rb-independent apoptosis efficiently when both Bcl-xL and Mcl-1, two anti-apoptotic Bcl-2 proteins, were inactivated or eliminated. Strikingly, when expressed in the Bcl-2 allKO cells, both Bax and Bak spontaneously associated with the outer mitochondrial membrane (OMM) through their respective helix 9, and this association triggered their homo-oligomerization/activation. Together, these results strongly suggest that the OMM, not BH3-only proteins or p53/Rb, is the long-sought-after direct activator of Bax/Bak following BH3-only-mediated neutralization of anti-apoptotic Bcl-2 proteins.

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Crossref · 10.1101/gad.276725.115

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  • Some BH3-only proteins including BAD, BMF, or HRK promote MOMP in the absence of a physical interaction with BAX or BAK.

    “Importantly, some BH3-only proteins including BCL2 associated agonist of cell death (BAD), Bcl2 modifying factor (BMF), or harakiri, BCL2 interacting protein (HRK) promote MOMP in the absence of a physical interaction with BAX or BAK.”
  • These BH3-only proteins (sensitizers or inactivators) bind to anti-apoptotic BCL2 family members and hence limit their availability to sequester BAX, BAK, or BH3-only activators.

    “These BH3-only proteins, which are sometimes referred to as “sensitizers” or “inactivators” bind to anti-apoptotic BCL2 family members and hence limit their availability to sequester BAX, BAK, or BH3-only activators [58, 93].”
  • BAX and BAK can self-activate in the absence of anti-apoptotic BCL2 family members and pro-apoptotic BH3 proteins (according to a relatively slow kinetics).

    “This observation is in line with the notion that BAX and BAK can self-activate in the absence of anti-apoptotic BCL2 family members and pro-apoptotic BH3 proteins (according to a relatively slow kinetics) [64, 93].”

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Authors
O'Neill, K. L., Huang, K., Zhang, J., Chen, Y., & Luo, X.
Affiliations
  • Fred and Pamela Buffett Cancer Center (US)
  • Central South University (CN)
Corresponding author
Luo, Xu
Venue
Genes & Development
Published
2016-04-07
Volume
30
Issue
8
Pages
973-988
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2329205123
Cited by
323
References
63
Citations by year
2026: 14 · 2025: 23 · 2024: 37 · 2023: 28 · 2022: 35 · 2021: 42 · 2020: 40 · 2019: 29 · 2018: 30 · 2017: 30 · 2016: 15
Type
posted content
Language
en
Open access
Licence
cc-by-nc
Locations
  • Genes & Development (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Nebraska Center for Cellular Signaling (P20-GM103489)
  • Nebraska Research Initiative Funds
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
Bax activation, Bak activation, Bcl-2 family proteins, BH3-only proteins, mitochondrial outer membrane, mitochondrial apoptosis, Bcl-xL, Mcl-1, p53-independent apoptosis
MeSH terms
Animals, Cell Line, Gene Expression Regulation, HeLa Cells, Humans, Apoptosis, Proto-Oncogene Proteins c-bcl-2, Gene Silencing, HCT116 Cells, bcl-2 Homologous Antagonist-Killer Protein, bcl-2-Associated X Protein, Mitochondrial Membranes, Mice, Myeloid Cell Leukemia Sequence 1 Protein

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