1IF1 image
Deposition Date 1997-09-12
Release Date 1998-02-25
Last Version Date 2024-02-07
Entry Detail
PDB ID:
1IF1
Title:
INTERFERON REGULATORY FACTOR 1 (IRF-1) COMPLEX WITH DNA
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.30
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PROTEIN (INTERFERON REGULATORY FACTOR 1)
Gene (Uniprot):Irf1
Chain IDs:C (auth: A), D (auth: B)
Chain Length:113
Number of Molecules:2
Biological Source:Mus musculus
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (26-MER)
Chain IDs:A (auth: C), B (auth: D)
Chain Length:26
Number of Molecules:2
Biological Source:synthetic construct
Primary Citation
Structure of IRF-1 with bound DNA reveals determinants of interferon regulation.
Nature 391 103 106 (1998)
PMID: 9422515 DOI: 10.1038/34224

Abstact

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.

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Primary Citation of related structures