Cited by 634Cell death mechanisms and regulationMitochondrial Function and PathologyAutophagy in Disease and Therapy

Bcl-xL Retrotranslocates Bax from the Mitochondria into the Cytosol

Open access
Edlich, Frank, Banerjee, Soojay, Suzuki, Motoshi, Cleland, Megan M., Arnoult, Damien, Wang, Chunxin, Neutzner, Albert, Tjandra, Nico +1 more·2011·Cell

Abstract

The Bcl-2 family member Bax translocates from the cytosol to mitochondria, where it oligomerizes and permeabilizes the mitochondrial outer membrane to promote apoptosis. Bax activity is counteracted by prosurvival Bcl-2 proteins, but how they inhibit Bax remains controversial because they neither colocalize nor form stable complexes with Bax. We constrained Bax in its native cytosolic conformation within cells using intramolecular disulfide tethers. Bax tethers disrupt interaction with Bcl-x(L) in detergents and cell-free MOMP activity but unexpectedly induce Bax accumulation on mitochondria. Fluorescence loss in photobleaching (FLIP) reveals constant retrotranslocation of WT Bax, but not tethered Bax, from the mitochondria into the cytoplasm of healthy cells. Bax retrotranslocation depends on prosurvival Bcl-2 family proteins, and inhibition of retrotranslocation correlates with Bax accumulation on the mitochondria. We propose that Bcl-x(L) inhibits and maintains Bax in the cytosol by constant retrotranslocation of mitochondrial Bax.

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Crossref · 10.1016/j.cell.2011.02.034

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49 of 49 references verified0 citation errors · 0 not checkable

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  • In physiological conditions, BAX continuously cycles between the OMM and the cytosol, where it exhibits a quiescent monomeric or inactive dimeric conformation.

    “In physiological conditions, BAX continuously cycles between the OMM and the cytosol, where it exhibits a quiescent monomeric or inactive dimeric conformation [48–50].”
  • Upon induction of apoptosis, BAX retrotranslocation ceases as the mitochondrial pools of BAX and BAK undergo direct or indirect activation by pro-apoptotic BH3-only proteins.

    “Upon induction of apoptosis, BAX retrotranslocation ceases as the mitochondrial pools of BAX and BAK undergo direct or indirect activation (see below) by pro-apoptotic BH3-only proteins [48, 56–59].”
  • In physiological conditions, some anti-apoptotic BCL2 proteins, such as BCL-XL, exert a protective role by promoting the retrotranslocation of BAX and (to a lesser degree) BAK from the mitochondria to the cytoplasm, thus limiting their mitochondrial pool.

    “Of note, in physiological conditions, some anti-apoptotic BCL2 proteins, such as BCL-XL, exert a protective role by promoting the retrotranslocation of BAX and (to a lesser degree) BAK from the mitochondria to the cytoplasm, thus limiting their mitochondrial pool [48, 55, 111].”

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Authors
Edlich, F., Banerjee, S., Suzuki, M., Cleland, M. M., Arnoult, D., Wang, C., Neutzner, A., Tjandra, N., & Youle, R. J.
Affiliations
  • National Institutes of Health (US)
  • Inserm (FR)
  • University Hospital of Basel (CH)
Corresponding author
Youle, Richard J.
Venue
Cell
Publisher
Elsevier BV
Published
2011-04
Volume
145
Issue
1
Pages
104-116
ISSN
0092-8674 (ISSN-L)
OpenAlex
W1995354282
Cited by
630
References
50
Citations by year
2026: 32 · 2025: 28 · 2024: 35 · 2023: 39 · 2022: 41 · 2021: 61 · 2020: 52 · 2019: 58 · 2018: 36 · 2017: 39 · 2016: 41 · 2015: 36 · 2014: 32 · 2013: 43 · 2012: 42
FWCI
16.99
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Ligue Contre le Cancer
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (ZIANS002859)
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, Bcl-xL, retrotranslocation, mitochondrial outer membrane permeabilization, apoptosis, Bcl-2 family proteins, mitochondrial membrane potential, Bax oligomerization
MeSH terms
Cytosol, Humans, Mitochondria, Protein Conformation, Apoptosis, Protein Folding, Protein Transport, Cell Line, Tumor, bcl-X Protein, bcl-2-Associated X Protein

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