1QWT

Auto-inhibitory interferon regulation factor-3 (IRF3) transactivation domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of IRF-3 reveals mechanism of autoinhibition and virus induced phospho-activation

Qin, B.Y.Liu, C.Lam, S.S.Srinath, H.Delston, R.Correia, J.J.Derynck, R.Lin, K.

(2003) Nat Struct Biol 10: 913-921

  • DOI: 10.1038/nsb1002
  • Primary Citation of Related Structures:  
    1QWT

  • PubMed Abstract: 
  • IRF-3, a member of the interferon regulatory factor (IRF) family of transcription factors, functions as a molecular switch for antiviral activity. IRF-3 uses an autoinhibitory mechanism to suppress its transactivation potential in uninfected cells, and virus infection induces phosphorylation and activation of IRF-3 to initiate the antiviral responses ...

    IRF-3, a member of the interferon regulatory factor (IRF) family of transcription factors, functions as a molecular switch for antiviral activity. IRF-3 uses an autoinhibitory mechanism to suppress its transactivation potential in uninfected cells, and virus infection induces phosphorylation and activation of IRF-3 to initiate the antiviral responses. The crystal structure of the IRF-3 transactivation domain reveals a unique autoinhibitory mechanism, whereby the IRF association domain and the flanking autoinhibitory elements condense to form a hydrophobic core. The structure suggests that phosphorylation reorganizes the autoinhibitory elements, leading to unmasking of a hydrophobic active site and realignment of the DNA binding domain for transcriptional activation. IRF-3 exhibits marked structural and surface electrostatic potential similarity to the MH2 domain of the Smad protein family and the FHA domain, suggesting a common molecular mechanism of action among this superfamily of signaling mediators.


    Organizational Affiliation

    Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester 01605, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Interferon regulatory factor 3A, B255Homo sapiensMutation(s): 0 
Gene Names: IRF3
UniProt & NIH Common Fund Data Resources
Find proteins for Q14653 (Homo sapiens)
Explore Q14653 
Go to UniProtKB:  Q14653
PHAROS:  Q14653
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135.545α = 90
b = 135.545β = 90
c = 68.521γ = 90
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 2003-09-03 
  • Released Date: 2003-10-14 
  • Deposition Author(s): Qin, B.Y.

Revision History  (Full details and data files)

  • Version 1.0: 2003-10-14
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance