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BH3-Only Proteins and BH3 Mimetics Induce Autophagy by Competitively Disrupting the Interaction between Beclin 1 and Bcl-2/Bcl-XL
Open accessAbstract
Beclin 1 has recently been identified as novel BH3-only protein, meaning that it carries one Bcl-2-homology-3 (BH3) domain. As other BH3-only proteins, Beclin 1 interacts with anti-apoptotic multidomain proteins of the Bcl-2 family (in particular Bcl-2 and its homologue Bcl-X(L)) by virtue of its BH3 domain, an amphipathic alpha-helix that binds to the hydrophobic cleft of Bcl-2/Bcl-X(L). The BH3 domains of other BH3-only proteins such as Bad, as well as BH3-mimetic compounds such as ABT737, competitively disrupt the inhibitory interaction between Beclin 1 and Bcl-2/Bcl-X(L). This causes autophagy of mitochondria (mitophagy) but not of the endoplasmic reticulum (reticulophagy). Only ER-targeted (not mitochondrion-targeted) Bcl-2/Bcl-X(L) can inhibit autophagy induced by Beclin 1, and only Beclin 1-Bcl-2/Bcl-X(L) complexes present in the ER (but not those present on heavy membrane fractions enriched in mitochondria) are disrupted by ABT737. These findings suggest that the Beclin 1-Bcl-2/Bcl-X(L) complexes that normally inhibit autophagy are specifically located in the ER and point to an organelle-specific regulation of autophagy. Furthermore, these data suggest a spatial organization of autophagy and apoptosis control in which BH3-only proteins exert two independent functions. On the one hand, they can induce apoptosis, by (directly or indirectly) activating the mitochondrion-permeabilizing function of pro-apoptotic multidomain proteins from the Bcl-2 family. On the other hand, they can activate autophagy by liberating Beclin 1 from its inhibition by Bcl-2/Bcl-X(L) at the level of the endoplasmic reticulum.
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Metadata
- Authors
- Maiuri, M. C., Criollo, A., Tasdemir, E., Vicencio, J. M., Tajeddine, N., Hickman, J. A., Geneste, O., & Kroemer, G.
- Venue
- Autophagy
- Publisher
- Informa UK Limited
- Published
- 2007-07-16
- Volume
- 3
- Issue
- 4
- Pages
- 374-376
- ISSN
- 1554-8627 (ISSN-L)
- 1554-8635
- OpenAlex
- W2052041444
- Cited by
- 427
- References
- 1
- FWCI
- 18.42
- Type
- journal article
- Language
- en
- Open access
- bronze
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