3QQ2 image
Entry Detail
PDB ID:
3QQ2
Title:
Crystal Structure of the Beta Domain of the Bordetella Autotransporter Brka
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2011-02-14
Release Date:
2011-04-13
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.32
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:BrkA autotransporter
Mutations:L727M
Chain IDs:A, B, C
Chain Length:284
Number of Molecules:3
Biological Source:Bordetella pertussis
Ligand Molecules
Primary Citation
Autotransporter passenger domain secretion requires a hydrophobic cavity at the extracellular entrance of the beta-domain pore
Biochem.J. 435 577 587 (2011)
PMID: 21306302 DOI: 10.1042/BJ20101548

Abstact

Whooping cough (pertussis) is a highly contagious acute respiratory illness of humans caused by the Gram-negative bacterial pathogen Bordetella pertussis. The AT (autotransporter) BrkA (Bordetella serum-resistance killing protein A) is an important B. pertussis virulence factor that confers serum resistance and mediates adherence. In the present study, we have solved the crystal structure of the BrkA β-domain at 3 Å (1 Å=0.1 nm) resolution. Special features are a hairpin-like structure formed by the external loop L4, which is observed fortuitously sitting inside the pore of the crystallographic adjacent β-domain, and a previously undiscovered hydrophobic cavity formed by patches on loop L4 and β-strands S5 and S6. This adopts a ubiquitous structure characteristic of all AT β-domains. Mutagenesis studies have demonstrated that the hairpin-like structure and hydrophobic cavity are crucial for BrkA passenger domain (virulence effector) translocation. This structure helps in understanding the molecular mechanism of AT assembly and secretion and provides a potential target for anti-pertussis drug design.

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Primary Citation of related structures