6N1H

Cryo-EM structure of ASC-CARD filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.17 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


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Literature

Cryo-EM structures of ASC and NLRC4 CARD filaments reveal a unified mechanism of nucleation and activation of caspase-1.

Li, Y.Fu, T.M.Lu, A.Witt, K.Ruan, J.Shen, C.Wu, H.

(2018) Proc Natl Acad Sci U S A 115: 10845-10852

  • DOI: 10.1073/pnas.1810524115
  • Primary Citation of Related Structures:  
    6N1I, 6N1H

  • PubMed Abstract: 
  • Canonical inflammasomes are cytosolic supramolecular complexes that activate caspase-1 upon sensing extrinsic microbial invasions and intrinsic sterile stress signals. During inflammasome assembly, adaptor proteins ASC and NLRC4 recruit caspase-1 through homotypic caspase recruitment domain (CARD) interactions, leading to caspase-1 dimerization and activation ...

    Canonical inflammasomes are cytosolic supramolecular complexes that activate caspase-1 upon sensing extrinsic microbial invasions and intrinsic sterile stress signals. During inflammasome assembly, adaptor proteins ASC and NLRC4 recruit caspase-1 through homotypic caspase recruitment domain (CARD) interactions, leading to caspase-1 dimerization and activation. Activated caspase-1 processes proinflammatory cytokines and Gasdermin D to induce cytokine maturation and pyroptotic cell death. Here, we present cryo-electron microscopy (cryo-EM) structures of NLRC4 CARD and ASC CARD filaments mediated by conserved three types of asymmetric interactions (types I, II, and III). We find that the CARDs of these two adaptor proteins share a similar assembly pattern, which matches that of the caspase-1 CARD filament whose structure we defined previously. These data indicate a unified mechanism for downstream caspase-1 recruitment through CARD-CARD interactions by both adaptors. Using structure modeling, we further show that full-length NLRC4 assembles via two separate symmetries at its CARD and its nucleotide-binding domain (NBD), respectively.


    Organizational Affiliation

    Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Apoptosis-associated speck-like protein containing a CARD
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
83Homo sapiensMutation(s): 0 
Gene Names: PYCARDASCCARD5TMS1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9ULZ3 (Homo sapiens)
Explore Q9ULZ3 
Go to UniProtKB:  Q9ULZ3
PHAROS:  Q9ULZ3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.17 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2018-11-08 
  • Released Date: 2018-12-05 
  • Deposition Author(s): Li, Y., Fu, T., Wu, H.
  • This entry supersedes: 6DRN

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-05
    Type: Initial release