5FNA

Cryo-EM reconstruction of caspase-1 CARD


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.8 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Molecular Basis of Caspase-1 Polymerization and its Inhibition by a Novel Capping Mechanism

Li, Y.Lu, A.Schmidt, F.I.Yin, Q.Chen, S.Fu, T.M.Tong, A.B.Ploegh, H.L.Mao, Y.Wu, H.

(2016) Nat.Struct.Mol.Biol. 23: 416

  • DOI: 10.1038/nsmb.3199

  • PubMed Abstract: 
  • Inflammasomes are cytosolic caspase-1-activation complexes that sense intrinsic and extrinsic danger signals, and trigger inflammatory responses and pyroptotic cell death. Homotypic interactions among Pyrin domains and caspase recruitment domains (CA ...

    Inflammasomes are cytosolic caspase-1-activation complexes that sense intrinsic and extrinsic danger signals, and trigger inflammatory responses and pyroptotic cell death. Homotypic interactions among Pyrin domains and caspase recruitment domains (CARDs) in inflammasome-complex components mediate oligomerization into filamentous assemblies. Several cytosolic proteins consisting of only interaction domains exert inhibitory effects on inflammasome assembly. In this study, we determined the structure of the human caspase-1 CARD domain (caspase-1(CARD)) filament by cryo-electron microscopy and investigated the biophysical properties of two caspase-1-like CARD-only proteins: human inhibitor of CARD (INCA or CARD17) and ICEBERG (CARD18). Our results reveal that INCA caps caspase-1 filaments, thereby exerting potent inhibition with low-nanomolar Ki on caspase-1(CARD) polymerization in vitro and inflammasome activation in cells. Whereas caspase-1(CARD) uses six complementary surfaces of three types for filament assembly, INCA is defective in two of the six interfaces and thus terminates the caspase-1 filament.


    Organizational Affiliation

    Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CASPASE-1
A, B, C, D, E, F, G, H
85Homo sapiensMutation(s): 0 
Gene Names: CASP1 (IL1BC, IL1BCE)
EC: 3.4.22.36
Find proteins for P29466 (Homo sapiens)
Go to Gene View: CASP1
Go to UniProtKB:  P29466
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.8 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-03-30
    Type: Initial release
  • Version 1.1: 2016-04-06
    Type: Database references
  • Version 1.2: 2016-04-13
    Type: Database references
  • Version 1.3: 2016-05-18
    Type: Database references
  • Version 1.4: 2017-08-30
    Type: Data collection