Crystal structure of the TIR domain from the flax disease resistance protein L6

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 

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Structural and Functional Analysis of a Plant Resistance Protein TIR Domain Reveals Interfaces for Self-Association, Signaling, and Autoregulation.

Bernoux, M.Ve, T.Williams, S.Warren, C.Hatters, D.Valkov, E.Zhang, X.Ellis, J.G.Kobe, B.Dodds, P.N.

(2011) Cell Host Microbe 9: 200-211

  • DOI: https://doi.org/10.1016/j.chom.2011.02.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Toll/interleukin-1 receptor (TIR) domain occurs in animal and plant immune receptors. In the animal Toll-like receptors, homodimerization of the intracellular TIR domain is required for initiation of signaling cascades leading to innate immunity. By contrast, the role of the TIR domain in cytoplasmic nucleotide-binding/leucine-rich repeat (NB-LRR) plant immune resistance proteins is poorly understood. L6 is a TIR-NB-LRR resistance protein from flax (Linum usitatissimum) that confers resistance to the flax rust phytopathogenic fungus (Melampsora lini). We determine the crystal structure of the L6 TIR domain and show that, although dispensable for pathogenic effector protein recognition, the TIR domain alone is both necessary and sufficient for L6 immune signaling. We demonstrate that the L6 TIR domain self-associates, most likely forming a homodimer. Analysis of the structure combined with site-directed mutagenesis suggests that self-association is a requirement for immune signaling and reveals distinct surface regions involved in self-association, signaling, and autoregulation.

  • Organizational Affiliation

    CSIRO Plant Industry, Canberra, Australian Capital Territory 2601, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
204Linum usitatissimumMutation(s): 0 
Find proteins for Q9XEH0 (Linum usitatissimum)
Explore Q9XEH0 
Go to UniProtKB:  Q9XEH0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9XEH0
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CO

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.941α = 90
b = 102.241β = 90
c = 58.3γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
Blu-Icedata collection
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-04-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description