4LZP

Structure of the TIR domain of the immunosuppressor BtpA from Brucella

• PDB DOI: https://doi.org/10.2210/pdb4LZP/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Brucella melitensis ATCC 23457
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-08-01 Released: 2013-11-06 
• Deposition Author(s): Kaplan-turkoz, B., O'callaghan, D., Vergunst, A., Terradot, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.15 Å
• R-Value Free: 0.279 
• R-Value Work: 0.222 
• R-Value Observed: 0.225 

Starting Model: experimental

Literature

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

• PubMed: 24076024 
• DOI: https://doi.org/10.1016/j.febslet.2013.09.007
• Primary Citation of Related Structures:  
  4LZP


• 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.

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Organizational Affiliation: 

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

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 79.81 kDa 
• Atom Count: 4,669 
• Modelled Residue Count: 584 
• Deposited Residue Count: 704 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Putative uncharacterized protein	A [auth B], B [auth C], C [auth A], D	176	Brucella melitensis ATCC 23457	Mutation(s): 0  Gene Names: BMEA_A0279 EC: 3.2.2 (UniProt), 3.2.2.6 (UniProt)
UniProt
Find proteins for C0RGW8 (Brucella melitensis biotype 2 (strain ATCC 23457)) Explore C0RGW8  Go to UniProtKB:  C0RGW8

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 68.143	α = 90
b = 73.928	β = 90
c = 137.645	γ = 90

Software Package:

Software Name	Purpose
MxCuBE	data collection
PHASER	phasing
PHENIX	refinement
XDS	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2013-11-06 
Deposition Author(s): Kaplan-turkoz, B., O'callaghan, D., Vergunst, A., Terradot, L.

Revision History  

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