4LZP image
Deposition Date 2013-08-01
Release Date 2013-11-06
Last Version Date 2023-11-08
Entry Detail
PDB ID:
4LZP
Keywords:
Title:
Structure of the TIR domain of the immunosuppressor BtpA from Brucella
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.15 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Putative uncharacterized protein
Gene (Uniprot):tcpB
Chain IDs:A (auth: B), B (auth: C), C (auth: A), D
Chain Length:176
Number of Molecules:4
Biological Source:Brucella melitensis
Primary Citation
Structure of the Toll/interleukin 1 receptor (TIR) domain of the immunosuppressive Brucella effector BtpA/Btp1/TcpB
Febs Lett. 587 3412 3416 (2013)
PMID: 24076024 DOI: 10.1016/j.febslet.2013.09.007

Abstact

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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