Cited by 310Cell death mechanisms and regulationCancer-related Molecular PathwaysProtein Structure and Dynamics

BH3-Triggered Structural Reorganization Drives the Activation of Proapoptotic BAX

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Gavathiotis, Evripidis, Reyna, Denis E., Davis, Marguerite L., Bird, Gregory H., Walensky, Loren D.·2010·Molecular Cell

Abstract

BAX is a proapoptotic BCL-2 family member that lies dormant in the cytosol until converted into a killer protein in response to cellular stress. Having recently identified the elusive trigger site for direct BAX activation, we now delineate by NMR and biochemical methods the essential allosteric conformational changes that transform ligand-triggered BAX into a fully activated monomer capable of propagating its own activation. Upon BAX engagement by a triggering BH3 helix, the unstructured loop between α helices 1 and 2 is displaced, the carboxy-terminal helix 9 is mobilized for membrane translocation, and the exposed BAX BH3 domain propagates the death signal through an autoactivating interaction with the trigger site of inactive BAX monomers. Our structure-activity analysis of this seminal apoptotic process reveals pharmacologic opportunities to modulate cell death by interceding at key steps of the BAX activation pathway.

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Crossref · 10.1016/j.molcel.2010.10.019

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  • BID, BIM, PUMA, and NOXA share the ability to physically interact with the mitochondrial pool of BAX and/or BAK to promote conformational changes culminating with dissociation of the core and latch domains of BCL2 effectors.

    “BID, BIM, PUMA, and NOXA share the ability to physically (but transiently) interact with the mitochondrial pool of BAX and/or BAK (hence being known as “activators”) to promote a series of conformational changes [59, 64, 67, 71–74] culminating with the dissociation of the core and latch domains of BCL2 effectors [75–77].”

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Authors
Gavathiotis, E., Reyna, D. E., Davis, M. L., Bird, G. H., & Walensky, L. D.
Affiliations
Boston Children's Hospital (US)
Corresponding author
Walensky, Loren D.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2010-11
Volume
40
Issue
3
Pages
481-492
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2081490942
Cited by
310
References
66
Citations by year
2026: 15 · 2025: 10 · 2024: 13 · 2023: 19 · 2022: 16 · 2021: 18 · 2020: 12 · 2019: 17 · 2018: 17 · 2017: 20 · 2016: 32 · 2015: 25 · 2014: 20 · 2013: 37 · 2012: 19
FWCI
9.77
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Heart Association
  • American Society of Hematology
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R00HL095929, K99HL095929)
  • National Cancer Institute (R01CA050239)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
Bax, Bcl-2 family proteins, apoptosis, BH3 domain, allosteric conformational change, Bax activation, self-activation, membrane translocation, BCL-2 inhibitor, structure-activity analysis
MeSH terms
Amino Acid Sequence, Binding Sites, Humans, Ligands, Mitochondria, Models, Biological, Models, Molecular, Molecular Sequence Data, Protein Binding, Structure-Activity Relationship, Apoptosis, Protein Structure, Secondary, Protein Transport, bcl-2-Associated X Protein, Hydrophobic and Hydrophilic Interactions

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