1IF1

INTERFERON REGULATORY FACTOR 1 (IRF-1) COMPLEX WITH DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of IRF-1 with bound DNA reveals determinants of interferon regulation.

Escalante, C.R.Yie, J.Thanos, D.Aggarwal, A.K.

(1998) Nature 391: 103-106

  • DOI: 10.1038/34224
  • Primary Citation of Related Structures:  
    1IF1

  • PubMed Abstract: 
  • The family of interferon regulatory factor (IRF) transcription factors is important in the regulation of interferons in response to infection by virus and in the regulation of interferon-inducible genes. The IRF family is characterized by a unique 'tryptophan cluster' DNA-binding region ...

    The family of interferon regulatory factor (IRF) transcription factors is important in the regulation of interferons in response to infection by virus and in the regulation of interferon-inducible genes. The IRF family is characterized by a unique 'tryptophan cluster' DNA-binding region. Here we report the crystal structure of the IRF-1 region bound to the natural positive regulatory domain I (PRD I) DNA element from the interferon-beta promoter. The structure provides the first three-dimensional view of a member of the growing IRF family, revealing a new helix-turn-helix motif that latches onto DNA through three of the five conserved tryptophans. The motif selects a short GAAA core sequence through an obliquely angled recognition helix, with an accompanying bending of the DNA axis in the direction of the protein. Together, these features suggest a basis for the occurrence of GAAA repeats within IRF response elements and provide clues to the assembly of the higher-order interferon-beta enhancesome.


    Related Citations: 
    • Expression, Purification, and Co-Crystallization of Irf-1 Bound to the Interferon-Beta Element Prdi
      Escalante, C.R., Yie, J., Thanos, D., Aggarwal, A.K.
      (1997) FEBS Lett 414: 219

    Organizational Affiliation

    Structural Biology Program, Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, New York 10029, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (INTERFERON REGULATORY FACTOR 1)C [auth A], D [auth B]113Mus musculusMutation(s): 0 
Gene Names: Irf1
UniProt
Find proteins for P15314 (Mus musculus)
Explore P15314 
Go to UniProtKB:  P15314
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (26-MER)A [auth C], B [auth D]26synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.8α = 90
b = 84.8β = 90
c = 203.7γ = 120
Software Package:
Software NamePurpose
PHASESphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-02-25
    Type: Initial release
  • Version 1.1: 2008-05-22
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-02-15
    Changes: Source and taxonomy, Structure summary