6MKS

Cryo-EM structure of NLRC4-CARD filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Cryo-EM structure of the NLRC4CARDfilament provides insights into how symmetric and asymmetric supramolecular structures drive inflammasome assembly.

Matyszewski, M.Zheng, W.Lueck, J.Antiochos, B.Egelman, E.H.Sohn, J.

(2018) J Biol Chem 293: 20240-20248

  • DOI: https://doi.org/10.1074/jbc.RA118.006050
  • Primary Citation of Related Structures:  
    6MKS

  • PubMed Abstract: 

    Inflammasomes are supramolecular signaling platforms integral to innate immune defense against invading pathogens. The NOD-like receptor (NLR) family apoptosis inhibitory protein (NAIP)·NLR family caspase-recruiting domain (CARD) domain-containing 4 (NLRC4) inflammasome recognizes intracellular bacteria and induces the polymerization of the caspase-1 protease, which in turn executes maturation of interleukin-1β (IL-1β) and pyroptosis. Several high-resolution structures of the fully assembled NAIP·NLRC4 complex are available, but these structures do not resolve the architecture of the CARD filament in atomic detail. Here, we present the cryo-EM structure of the filament assembled by the CARD of human NLRC4 (NLRC4 CARD ) at 3.4 Å resolution. The structure revealed that the helical architecture of the NLRC4 CARD filament is essentially identical to that of the downstream filament assembled by the CARD of caspase-1 (casp1 CARD ), but deviates from the split washer-like assembly of the NAIP·NLRC4 oligomer. Our results suggest that architectural complementarity is a major driver for the recognition between upstream and downstream CARD assemblies in inflammasomes. Furthermore, a Monte Carlo simulation of the NLRC4 CARD filament assembly rationalized why an (un)decameric NLRC4 oligomer is optimal for assembling the helical base of the NLRC4 CARD filament. Together, our results explain how symmetric and asymmetric supramolecular assemblies enable high-fidelity signaling in inflammasomes.


  • Organizational Affiliation

    From the Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chimera protein of NLR family CARD domain-containing protein 4 and EGFP340Homo sapiensVaccinia virus
This entity is chimeric
Mutation(s): 0 
Gene Names: NLRC4CARD12CLANCLAN1IPAFUNQ6189/PRO20215EGFP
UniProt & NIH Common Fund Data Resources
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Find proteins for Q9NPP4 (Homo sapiens)
Explore Q9NPP4 
Go to UniProtKB:  Q9NPP4
PHAROS:  Q9NPP4
GTEx:  ENSG00000091106 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP42212Q9NPP4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONSPIDER
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM0352569
American Cancer SocietyUnited StatesRG-15-224

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-11-14
    Changes: Data collection, Database references
  • Version 1.2: 2019-01-09
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence, Other
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Refinement description