Structure of duck RIG-I tandem CARDs and helicase domain

Experimental Data Snapshot

  • Resolution: 3.40 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.241 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Structural Basis for the Activation of Innate Immune Pattern Recognition Receptor Rig-I by Viral RNA.

Kowalinski, E.Lunardi, T.Mccarthy, A.A.Louber, J.Brunel, J.Grigorov, B.Gerlier, D.Cusack, S.

(2011) Cell 147: 423

  • DOI: https://doi.org/10.1016/j.cell.2011.09.039
  • Primary Citation of Related Structures:  
    4A2P, 4A2Q, 4A2V, 4A2W, 4A2X, 4A36

  • PubMed Abstract: 

    RIG-I is a key innate immune pattern-recognition receptor that triggers interferon expression upon detection of intracellular 5'triphosphate double-stranded RNA (5'ppp-dsRNA) of viral origin. RIG-I comprises N-terminal caspase activation and recruitment domains (CARDs), a DECH helicase, and a C-terminal domain (CTD). We present crystal structures of the ligand-free, autorepressed, and RNA-bound, activated states of RIG-I. Inactive RIG-I has an open conformation with the CARDs sequestered by a helical domain inserted between the two helicase moieties. ATP and dsRNA binding induce a major rearrangement to a closed conformation in which the helicase and CTD bind the blunt end 5'ppp-dsRNA with perfect complementarity but incompatibly with continued CARD binding. We propose that after initial binding of 5'ppp-dsRNA to the flexibly linked CTD, co-operative tight binding of ATP and RNA to the helicase domain liberates the CARDs for downstream signaling. These findings significantly advance our molecular understanding of the activation of innate immune signaling helicases.

  • Organizational Affiliation

    European Molecular Biology Laboratory, Grenoble Outstation, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
C [auth D],
D [auth E]
797Anas platyrhynchosMutation(s): 0 
Find proteins for D3TI84 (Anas platyrhynchos)
Explore D3TI84 
Go to UniProtKB:  D3TI84
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD3TI84
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.40 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.241 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 314.97α = 90
b = 134.49β = 92.17
c = 102.26γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-10-19
    Type: Initial release
  • Version 1.1: 2011-10-26
    Changes: Database references
  • Version 1.2: 2012-02-08
    Changes: Other
  • Version 1.3: 2019-04-03
    Changes: Data collection, Other, Source and taxonomy
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Other, Refinement description