Cited by 281Cell death mechanisms and regulationMitochondrial Function and PathologyAutophagy in Disease and Therapy

Bax assembles into large ring‐like structures remodeling the mitochondrial outer membrane in apoptosis

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Große, Lena, Wurm, Christian A, Brüser, Christian, Neumann, Daniel, Jans, Daniel C, Jakobs, Stefan·2016·The EMBO Journal

Abstract

The Bcl‐2 family proteins Bax and Bak are essential for the execution of many apoptotic programs. During apoptosis, Bax translocates to the mitochondria and mediates the permeabilization of the outer membrane, thereby facilitating the release of pro‐apoptotic proteins. Yet the mechanistic details of the Bax‐induced membrane permeabilization have so far remained elusive. Here, we demonstrate that activated Bax molecules, besides forming large and compact clusters, also assemble, potentially with other proteins including Bak, into ring‐like structures in the mitochondrial outer membrane. STED nanoscopy indicates that the area enclosed by a Bax ring is devoid of mitochondrial outer membrane proteins such as Tom20, Tom22, and Sam50. This strongly supports the view that the Bax rings surround an opening required for mitochondrial outer membrane permeabilization (MOMP). Even though these Bax assemblies may be necessary for MOMP, we demonstrate that at least in Drp1 knockdown cells, these assemblies are not sufficient for full cytochrome c release. Together, our super‐resolution data provide direct evidence in support of large Bax‐delineated pores in the mitochondrial outer membrane as being crucial for Bax‐mediated MOMP in cells.

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  • Oligomerization of BAX and BAK ultimately leads to the assembly of a toroidal lipidic pore that alters mitochondrial permeability and causes profound rearrangements of the mitochondrial ultrastructure.

    “Oligomerization ultimately leads to the assembly of a toroidal lipidic pore that alters mitochondrial permeability and causes profound rearrangements of the mitochondrial ultrastructure [78, 84–86].”

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Authors
Große, L., Wurm, C. A., Brüser, C., Neumann, D., Jans, D. C., & Jakobs, S.
Affiliations
  • Universitätsmedizin Göttingen (DE)
  • Max Planck Institute for Biophysical Chemistry (DE)
Corresponding author
  • Jans, Daniel C
  • Jakobs, Stefan
Venue
The EMBO Journal
Published
2016-01-18
Volume
35
Issue
4
Pages
402-413
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2273341597
Cited by
281
References
56
Citations by year
2026: 13 · 2025: 15 · 2024: 14 · 2023: 27 · 2022: 19 · 2021: 26 · 2020: 33 · 2019: 40 · 2018: 30 · 2017: 36 · 2016: 28
FWCI
23.08
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion, other-oa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
  • GoeScholar The Publication Server of the Georg-August-Universität Göttingen (Georg-August-Universität Göttingen) (submittedVersion, cc-by)
  • GRO (submittedVersion, cc-by)
Funders
Cluster of Excellence and DFG Research Center Nanoscale Microscopy and Molecular Physiology of the Brain
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, mitochondrial outer membrane permeabilization, apoptosis, Bcl-2 family proteins, Bak, cytochrome c release, Drp1, Tom20, Tom22, Sam50, protein clustering, STED microscopy
MeSH terms
Cell Line, Humans, Microscopy, Fluorescence, Mitochondria, Permeability, Apoptosis, Cytochromes c, bcl-2-Associated X Protein, Mitochondrial Membranes, Pore Forming Cytotoxic Proteins, Protein Multimerization

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