4BSX

Crystal Structure of the N terminal domain of TRIF (TIR-domain- containing adapter-inducing interferon-beta)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

The Tlr Signalling Adaptor Trif/Ticam-1 Has an N-Terminal Helical Domain with Structural Similarity to Ifit Proteins

Ullah, M.O., Ve, T., Mangan, M., Alaidarous, M., Sweet, M.J., Mansell, A., Kobe, B.

(2013) Acta Crystallogr D Biol Crystallogr 69: 2420

  • DOI: 10.1107/S0907444913022385
  • Primary Citation of Related Structures:  
    4BSX, 4C0M

  • PubMed Abstract: 

    • TRIF/TICAM-1 (TIR domain-containing adaptor inducing interferon-β/TIR domain-containing adaptor molecule 1) is the adaptor protein in the Toll-like receptor (TLR) 3 and 4 signalling pathway that leads to the production of type 1 interferons and cytokines ...

    TRIF/TICAM-1 (TIR domain-containing adaptor inducing interferon-β/TIR domain-containing adaptor molecule 1) is the adaptor protein in the Toll-like receptor (TLR) 3 and 4 signalling pathway that leads to the production of type 1 interferons and cytokines. The signalling involves TIR (Toll/interleukin-1 receptor) domain-dependent TRIF oligomerization. A protease-resistant N-terminal region is believed to be involved in self-regulation of TRIF by interacting with its TIR domain. Here, the structural and functional characterization of the N-terminal domain of TRIF (TRIF-NTD) comprising residues 1-153 is reported. The 2.22 Å resolution crystal structure was solved by single-wavelength anomalous diffraction (SAD) using selenomethionine-labelled crystals of TRIF-NTD containing two additional introduced Met residues (TRIF-NTDA66M/L113M). The structure consists of eight antiparallel helices that can be divided into two subdomains, and the overall fold shares similarity to the interferon-induced protein with tetratricopeptide repeats (IFIT) family of proteins, which are involved in both the recognition of viral RNA and modulation of innate immune signalling. Analysis of TRIF-NTD surface features and the mapping of sequence conservation onto the structure suggest several possible binding sites involved in either TRIF auto-regulation or interaction with other signalling molecules or ligands. TRIF-NTD suppresses TRIF-mediated activation of the interferon-β promoter, as well as NF-κB-dependent reporter-gene activity. These findings thus identify opportunities for the selective targeting of TLR3- and TLR4-mediated inflammation.

    Organizational Affiliation: 

    School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TIR DOMAIN-CONTAINING ADAPTER MOLECULE 1A, B, C, D156Homo sapiensMutation(s): 2 
Gene Names: TICAM1, PRVTIRB, TRIF
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IUC6 (Homo sapiens)
Explore Q8IUC6 
Go to UniProtKB:  Q8IUC6
PHAROS:  Q8IUC6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IUC6
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A, B, C, D L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.307α = 88.66
b = 49.331β = 77.63
c = 70.142γ = 72.22
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-11
    Type: Initial release
  • Version 1.1: 2013-12-18
    Changes: Database references