5L08 image
Deposition Date 2016-07-26
Release Date 2016-11-02
Last Version Date 2024-03-06
Entry Detail
PDB ID:
5L08
Keywords:
Title:
Cryo-EM structure of Casp-8 tDED filament
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
Resolution:
4.60 Å
Aggregation State:
FILAMENT
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Caspase-8
Gene (Uniprot):CASP8
Chain IDs:A, B, C, D, E, F, G, H, I
Chain Length:184
Number of Molecules:9
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Cryo-EM Structure of Caspase-8 Tandem DED Filament Reveals Assembly and Regulation Mechanisms of the Death-Inducing Signaling Complex.
Mol.Cell 64 236 250 (2016)
PMID: 27746017 DOI: 10.1016/j.molcel.2016.09.009

Abstact

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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