5L08

Cryo-EM structure of Casp-8 tDED filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.60 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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

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.

(2016) Mol Cell 64: 236-250

  • DOI: 10.1016/j.molcel.2016.09.009
  • Structures With Same Primary Citation

  • PubMed 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 tand ...

    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.


    Organizational Affiliation

    Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115, USA. Electronic address: wu@crystal.harvard.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-8A, B, C, D, E, F, G, H, I184Homo sapiensMutation(s): 0 
Gene Names: CASP8MCH5
EC: 3.4.22.61
Find proteins for Q14790 (Homo sapiens)
Explore Q14790 
Go to UniProtKB:  Q14790
NIH Common Fund Data Resources
PHAROS  Q14790
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.60 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-11-02
    Type: Initial release
  • Version 1.1: 2016-11-30
    Changes: Refinement description