2PI0

Crystal Structure of IRF-3 bound to the PRDIII-I regulatory element of the human interferon-B enhancer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of IRF-3 bound to the PRDIII-I regulatory element of the human interferon-beta enhancer.

Escalante, C.R.Nistal-Villan, E.Shen, L.Garcia-Sastre, A.Aggarwal, A.K.

(2007) Mol.Cell 26: 703-716

  • DOI: 10.1016/j.molcel.2007.04.022

  • PubMed Abstract: 
  • Interferon regulatory factor 3 (IRF-3) is a key transcription factor in the assembly of the mammalian interferon-beta (IFN-beta) enhanceosome. We present here the structure of IRF-3 DNA binding domain in complex with the complete PRDIII-I regulatory ...

    Interferon regulatory factor 3 (IRF-3) is a key transcription factor in the assembly of the mammalian interferon-beta (IFN-beta) enhanceosome. We present here the structure of IRF-3 DNA binding domain in complex with the complete PRDIII-I regulatory element of the human IFN-beta enhancer. We show that four IRF-3 molecules bind in tandem to, variably spaced, consensus and nonconsensus IRF sites on the composite element. The ability of IRF-3 to bind these variable sites derives in part from two nonconserved arginines (Arg78 and Arg86) that partake in alternate protein-DNA contacts. We also show that the protein-DNA contacts are highly overlapped and that all four IRF sites are required for gene activation in vivo. In addition, we show that changing the nonconsensus IRF sites to consensus sites creates a more efficient enhancer in vivo. Together, the structure and accompanying biological data provide insights into the assembly of the IFN-beta enhanceosome in mammals.


    Organizational Affiliation

    Department of Structural and Chemical Biology, Mount Sinai School of Medicine, New York, NY 10029, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Interferon regulatory factor 3
A, B, C, D
116Homo sapiensGene Names: IRF3
Find proteins for Q14653 (Homo sapiens)
Go to Gene View: IRF3
Go to UniProtKB:  Q14653
Entity ID: 1
MoleculeChainsLengthOrganism
PRDIII-I region of human interferon-B promoter strand 1E32N/A
Entity ID: 2
MoleculeChainsLengthOrganism
PRDIII-I region of human interferon-B promoter strand 2F32N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 173.417α = 90.00
b = 46.132β = 129.42
c = 129.325γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
ADSCdata collection
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance