2IRF

CRYSTAL STRUCTURE OF AN IRF-2/DNA COMPLEX.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of an IRF-DNA complex reveals novel DNA recognition and cooperative binding to a tandem repeat of core sequences.

Fujii, Y.Shimizu, T.Kusumoto, M.Kyogoku, Y.Taniguchi, T.Hakoshima, T.

(1999) EMBO J 18: 5028-5041

  • DOI: 10.1093/emboj/18.18.5028
  • Primary Citation of Related Structures:  
    2IRF

  • PubMed Abstract: 
  • There has been growing interest in the role of the IRF (interferon regulatory factor) family of transcription factors in the regulation of immune responses, cytokine signaling, and oncogenesis. These members are characterized by their well-conserved DNA binding domains at the N-terminal regions ...

    There has been growing interest in the role of the IRF (interferon regulatory factor) family of transcription factors in the regulation of immune responses, cytokine signaling, and oncogenesis. These members are characterized by their well-conserved DNA binding domains at the N-terminal regions. Here we report the 2.2 A resolution crystal structure of the DNA binding domain of one such family member, IRF-2, bound to DNA. The structure reveals its recognition sequence, AANNGAAA (here, recognized bases are underlined and in bold, and N indicates any base), and its cooperative binding to a tandem repeat of the GAAA core sequence induced by DNA structure distortions. These facts explain well the diverse binding properties of the IRF family members, which bind to both single and tandemly repeated sequences. Furthermore, we also identified the 'helix-hairpin-strand motif' at the C terminus of the recognition helix as a metal binding site that is commonly found in certain classes of DNA-interactive proteins. Our results provide new insights into the structure and function of this family of transcription factors.


    Organizational Affiliation

    Department of Molecular Biology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
INTERFERON REGULATORY FACTOR 2G, H, I, J, K, L113Mus musculusMutation(s): 0 
Gene Names: Irf2
UniProt
Find proteins for P23906 (Mus musculus)
Explore P23906 
Go to UniProtKB:  P23906
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(P*AP*AP*GP*TP*GP*AP*AP*AP*GP*(5IU)P*GP*A)-3')A, B, C12N/A
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 2
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*TP*TP*CP*AP*CP*TP*TP*TP*CP*AP*CP*(5IU)P*T)-3')D, E, F13N/A
      Protein Feature View
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      • Reference Sequence
      Small Molecules
      Binding Affinity Annotations 
      IDSourceBinding Affinity
      DNA PDBBind:  2IRF Kd: 170 (nM) from 1 assay(s)
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.20 Å
      • R-Value Free: 0.243 
      • R-Value Work: 0.202 
      • R-Value Observed: 0.202 
      • Space Group: P 65 2 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 132.3α = 90
      b = 132.3β = 90
      c = 296.5γ = 120
      Software Package:
      Software NamePurpose
      X-PLORrefinement
      DENZOdata reduction
      SCALEPACKdata scaling

      Structure Validation

      View Full Validation Report




      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 1999-10-08
        Type: Initial release
      • Version 1.1: 2008-04-26
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Version format compliance