5JEK

Phosphorylated MAVS in complex with IRF-3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.195 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for concerted recruitment and activation of IRF-3 by innate immune adaptor proteins.

Zhao, B.Shu, C.Gao, X.Sankaran, B.Du, F.Shelton, C.L.Herr, A.B.Ji, J.Y.Li, P.

(2016) Proc Natl Acad Sci U S A 113: E3403-E3412

  • DOI: 10.1073/pnas.1603269113
  • Primary Citation of Related Structures:  
    5JEK, 5JEJ, 5JEM, 5JEL, 5JEO, 5JER

  • PubMed Abstract: 
  • Type I IFNs are key cytokines mediating innate antiviral immunity. cGMP-AMP synthase, ritinoic acid-inducible protein 1 (RIG-I)-like receptors, and Toll-like receptors recognize microbial double-stranded (ds)DNA, dsRNA, and LPS to induce the expression of type I IFNs ...

    Type I IFNs are key cytokines mediating innate antiviral immunity. cGMP-AMP synthase, ritinoic acid-inducible protein 1 (RIG-I)-like receptors, and Toll-like receptors recognize microbial double-stranded (ds)DNA, dsRNA, and LPS to induce the expression of type I IFNs. These signaling pathways converge at the recruitment and activation of the transcription factor IRF-3 (IFN regulatory factor 3). The adaptor proteins STING (stimulator of IFN genes), MAVS (mitochondrial antiviral signaling), and TRIF (TIR domain-containing adaptor inducing IFN-β) mediate the recruitment of IRF-3 through a conserved pLxIS motif. Here we show that the pLxIS motif of phosphorylated STING, MAVS, and TRIF binds to IRF-3 in a similar manner, whereas residues upstream of the motif confer specificity. The structure of the IRF-3 phosphomimetic mutant S386/396E bound to the cAMP response element binding protein (CREB)-binding protein reveals that the pLxIS motif also mediates IRF-3 dimerization and activation. Moreover, rotavirus NSP1 (nonstructural protein 1) employs a pLxIS motif to target IRF-3 for degradation, but phosphorylation of NSP1 is not required for its activity. These results suggest a concerted mechanism for the recruitment and activation of IRF-3 that can be subverted by viral proteins to evade innate immune responses.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843; pingwei@tamu.edu cshu2005@hotmail.com.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Interferon regulatory factor 3A, B242Homo sapiensMutation(s): 0 
Gene Names: IRF3
UniProt & NIH Common Fund Data Resources
Find proteins for Q14653 (Homo sapiens)
Explore Q14653 
Go to UniProtKB:  Q14653
PHAROS:  Q14653
Protein Feature View
Expand
  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MAVS peptideC, D18Homo sapiensMutation(s): 0 
Gene Names: MAVSIPS1KIAA1271VISA
UniProt & NIH Common Fund Data Resources
Find proteins for Q7Z434 (Homo sapiens)
Explore Q7Z434 
Go to UniProtKB:  Q7Z434
PHAROS:  Q7Z434
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
C, DL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.195 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.8α = 90
b = 104.91β = 106.13
c = 66.27γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 2016-04-18 
  • Released Date: 2016-06-15 
  • Deposition Author(s): Zhao, B., Li, P.

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-15
    Type: Initial release
  • Version 1.1: 2016-06-29
    Changes: Database references