Crystal Structure of the Beta Domain of the Bordetella Autotransporter Brka

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.269 

Starting Model: experimental
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Autotransporter passenger domain secretion requires a hydrophobic cavity at the extracellular entrance of the beta-domain pore

Zhai, Y.Zhang, K.Huo, Y.Zhu, Y.Zhou, Q.Lu, J.Black, I.Pang, X.Roszak, A.W.Zhang, X.Isaacs, N.W.Sun, F.

(2011) Biochem J 435: 577-587

  • DOI: https://doi.org/10.1042/BJ20101548
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    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.

  • Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BrkA autotransporter
A, B, C
284Bordetella pertussisMutation(s): 1 
Gene Names: BP3494brkA
Membrane Entity: Yes 
Find proteins for Q45340 (Bordetella pertussis (strain Tohama I / ATCC BAA-589 / NCTC 13251))
Explore Q45340 
Go to UniProtKB:  Q45340
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ45340
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.324 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.269 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.51α = 90
b = 122.372β = 90
c = 405.549γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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