7JFM

Crystal structure of mouse phosphorylated IRF-3 bound to CBP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Structural Basis of IRF-3 Activation upon Phosphorylation.

Jing, T.Zhao, B.Xu, P.Gao, X.Chi, L.Han, H.Sankaran, B.Li, P.

(2020) J Immunol 205: 1886-1896

  • DOI: https://doi.org/10.4049/jimmunol.2000026
  • Primary Citation of Related Structures:  
    7JFL, 7JFM

  • PubMed Abstract: 

    The innate immune system is the first line of defense against bacterial and viral infections. The recognition of pathogen-associated molecular patterns by the RIG-I-like receptors, TLRs, and cGAS leads to the induction of IFN-I by activating the transcription factor IRF-3. Although the mechanism of IRF-3 activation has been extensively studied, the structural basis of IRF-3 activation upon phosphorylation is not fully understood. In this study, we determined the crystal structures of phosphorylated human and mouse IRF-3 bound to CREB-binding protein (CBP), which reveal that phosphorylated IRF-3 forms a dimer via pSer 386 (pSer 379 in mouse IRF-3) and a downstream p L x IS motif. Size-exclusion chromatography and cell-based studies show that mutations of key residues interacting with pSer 386 severely impair IRF-3 activation and IFN-β induction. By contrast, phosphorylation of Ser 396 within the p L x IS motif of human IRF-3 only plays a moderate role in IRF-3 activation. The mouse IRF-3/CBP complex structure reveals that the mechanism of mouse IRF-3 activation is similar but distinct from human IRF-3. These structural and functional studies reveal the detailed mechanism of IRF-3 activation upon phosphorylation.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Interferon regulatory factor 3A,
C [auth B]
210Mus musculusMutation(s): 0 
Gene Names: Irf3
UniProt & NIH Common Fund Data Resources
Find proteins for P70671 (Mus musculus)
Explore P70671 
Go to UniProtKB:  P70671
IMPC:  MGI:1859179
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP70671
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CREB-binding proteinB [auth C],
D
47Homo sapiensMutation(s): 0 
Gene Names: CREBBPCBP
EC: 2.3.1.48
UniProt & NIH Common Fund Data Resources
Find proteins for Q92793 (Homo sapiens)
Explore Q92793 
Go to UniProtKB:  Q92793
PHAROS:  Q92793
GTEx:  ENSG00000005339 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92793
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
SEP
Query on SEP
A,
C [auth B]
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 
  • Space Group: P 62
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.801α = 90
b = 118.801β = 90
c = 72.17γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01 AI145287

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-09
    Type: Initial release
  • Version 1.1: 2020-10-07
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Database references, Refinement description