Cited by 198Cell death mechanisms and regulationInflammasome and immune disordersEnzyme Structure and Function

Cryo-EM Structure of Caspase-8 Tandem DED Filament Reveals Assembly and Regulation Mechanisms of the Death-Inducing Signaling Complex

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Fu, Tian-Min, Li, Yang, Lu, Alvin, Li, Zongli, Vajjhala, Parimala R., Cruz, Anthony C., Srivastava, Devendra B., DiMaio, Frank +5 more·2016·Molecular Cell

Abstract

Caspase-8 activation can be triggered by death receptor-mediated formation of the death-inducing signaling complex (DISC) and by the inflammasome adaptor ASC. Caspase-8 assembles with FADD at the DISC and with ASC at the inflammasome through its tandem death effector domain (tDED), which is regulated by the tDED-containing cellular inhibitor cFLIP and the viral inhibitor MC159. Here we present the caspase-8 tDED filament structure determined by cryoelectron microscopy. Extensive assembly interfaces not predicted by the previously proposed linear DED chain model were uncovered, and were further confirmed by structure-based mutagenesis in filament formation in vitro and Fas-induced apoptosis and ASC-mediated caspase-8 recruitment in cells. Structurally, the two DEDs in caspase-8 use quasi-equivalent contacts to enable assembly. Using the tDED filament structure as a template, structural analyses reveal the interaction surfaces between FADD and caspase-8 and the distinct mechanisms of regulation by cFLIP and MC159 through comingling and capping, respectively.

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Crossref · 10.1016/j.molcel.2016.09.009

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Authors
Fu, T.-M., Li, Y., Lu, A., Li, Z., Vajjhala, P. R., Cruz, A. C., Srivastava, D. B., DiMaio, F., Penczek, P. A., Siegel, R. M., Stacey, K. J., Egelman, E. H., & Wu, H.
Affiliations
  • Boston Children's Hospital (US)
  • Howard Hughes Medical Institute (US)
  • The University of Queensland (AU)
  • National Institutes of Health (US)
  • University of Washington (US)
  • Texas Medical Center (US)
  • University of Virginia (US)
Corresponding author
Wu, Hao
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2016-10
Volume
64
Issue
2
Pages
236-250
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2531084658
Cited by
196
References
48
Citations by year
2026: 16 · 2025: 22 · 2024: 24 · 2023: 9 · 2022: 16 · 2021: 35 · 2020: 25 · 2019: 24 · 2018: 13 · 2017: 10 · 2016: 1
FWCI
8.49
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Health and Medical Research Council
  • National Medical Research Council
  • National Institute of General Medical Sciences (R01GM060635)
  • National Institute of Allergy and Infectious Diseases (R37AI050872, R01AI045937, R01AI124491)
  • National Institute of Biomedical Imaging and Bioengineering (R01EB001567)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (DP1HD087988)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
caspase-8, death-inducing signaling complex, FADD, c-FLIP, ASC, inflammasome, death receptor signaling, caspase activation, protein filament assembly, protein-protein interfaces, Fas-mediated apoptosis, caspase inhibition
MeSH terms
Death Effector Domain, Protein Conformation, alpha-Helical, Protein Conformation, beta-Strand, Amino Acid Sequence, Binding Sites, Cytoskeletal Proteins, Humans, Plasmids, Protein Binding, Recombinant Fusion Proteins, Transfection, Viral Proteins, Gene Expression, Sequence Alignment, Apoptosis, Sequence Homology, Amino Acid, fas Receptor, Jurkat Cells, Cryoelectron Microscopy, Caspase 8, Fas-Associated Death Domain Protein, Death Domain Receptor Signaling Adaptor Proteins, CASP8 and FADD-Like Apoptosis Regulating Protein, CARD Signaling Adaptor Proteins, Protein Interaction Domains and Motifs

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