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tBID, a membrane-targeted death ligand, oligomerizes BAK to release cytochrome c

Open access
Wei, Michael C., Lindsten, Tullia, Mootha, Vamsi K., Weiler, Solly, Gross, Atan, Ashiya, Mona, Thompson, Craig B., Korsmeyer, Stanley J.·2000·Genes & Development

Abstract

TNFR1/Fas engagement results in the cleavage of cytosolic BID to truncated tBID, which translocates to mitochondria. Immunodepletion and gene disruption indicate BID is required for cytochrome c release. Surprisingly, the three-dimensional structure of this BH3 domain-only molecule revealed two hydrophobic α-helices suggesting tBID itself might be a pore-forming protein. Instead, we demonstrate that tBID functions as a membrane-targeted death ligand in which an intact BH3 domain is required for cytochrome c release, but not for targeting.Bak-deficient mitochondria and blocking antibodies reveal tBID binds to its mitochondrial partner BAK to release cytochrome c, a process independent of permeability transition. Activated tBID results in an allosteric activation of BAK, inducing its intramembranous oligomerization into a proposed pore for cytochrome c efflux, integrating the pathway from death receptors to cell demise.

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Crossref · 10.1101/gad.14.16.2060

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Metadata

Authors
Wei, M. C., Lindsten, T., Mootha, V. K., Weiler, S., Gross, A., Ashiya, M., Thompson, C. B., & Korsmeyer, S. J.
Venue
Genes & Development
Published
2000-08-15
Volume
14
Issue
16
Pages
2060-2071
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W1913661233
Cited by
1,268
References
1
Type
posted content
Language
en
Open access
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