Structure of the TIR domain of the immunosuppressor BtpA from Brucella

Experimental Data Snapshot

  • Resolution: 3.15 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.225 

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Structure of the Toll/interleukin 1 receptor (TIR) domain of the immunosuppressive Brucella effector BtpA/Btp1/TcpB

Kaplan-turkoz, B.Koelblen, T.Felix, C.Candusso, M.P.O'callaghan, D.Vergunst, A.C.Terradot, L.

(2013) FEBS Lett 587: 3412-3416

  • DOI: https://doi.org/10.1016/j.febslet.2013.09.007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    BtpA/Btp1/TcpB is a virulence factor produced by Brucella species that possesses a Toll interleukin-1 receptor (TIR) domain. Once delivered into the host cell, BtpA interacts with MyD88 to interfere with TLR signalling and modulates microtubule dynamics. Here the crystal structure of the BtpA TIR domain at 3.15 Å is presented. The structure shows a dimeric arrangement of a canonical TIR domain, similar to the Paracoccus denitrificans Tir protein but secured by a unique long N-terminal α-tail that packs against the TIR:TIR dimer. Structure-based mutations and multi-angle light scattering experiments characterized the BtpA dimer conformation in solution. The structure of BtpA will help with studies to understand the mechanisms involved in its interactions with MyD88 and with microtubules.

  • Organizational Affiliation

    UMR 5086, BMSSI, CNRS - Université Lyon 1, Institut de Biologie et Chimie des Protéines, 7 passage du Vercors, F-69367, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized proteinA [auth B],
B [auth C],
C [auth A],
176Brucella melitensis ATCC 23457Mutation(s): 0 
Gene Names: BMEA_A0279
Find proteins for C0RGW8 (Brucella melitensis biotype 2 (strain ATCC 23457))
Explore C0RGW8 
Go to UniProtKB:  C0RGW8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC0RGW8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.15 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.225 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.143α = 90
b = 73.928β = 90
c = 137.645γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-06
    Type: Initial release
  • Version 1.1: 2023-11-08
    Changes: Data collection, Database references, Refinement description