2PT7

Crystal structure of Cag VirB11 (HP0525) and an inhibitory protein (HP1451)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 

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This is version 1.1 of the entry. See complete history


Literature

Identification, structure and mode of action of a new regulator of the Helicobacter pylori HP0525 ATPase.

Hare, S.Fischer, W.Williams, R.Terradot, L.Bayliss, R.Haas, R.Waksman, G.

(2007) EMBO J 26: 4926-4934

  • DOI: 10.1038/sj.emboj.7601904
  • Primary Citation of Related Structures:  
    2PT7

  • PubMed Abstract: 
  • Helicobacter pylori is one of the world's most successful human pathogens causing gastric ulcers and cancers. A key virulence factor of H. pylori is the Cag pathogenicity island, which encodes a type IV secretion system. HP0525 is an essential component of the Cag system and acts as an inner membrane associated ATPase ...

    Helicobacter pylori is one of the world's most successful human pathogens causing gastric ulcers and cancers. A key virulence factor of H. pylori is the Cag pathogenicity island, which encodes a type IV secretion system. HP0525 is an essential component of the Cag system and acts as an inner membrane associated ATPase. HP0525 forms double hexameric ring structures, with the C-terminal domains (CTDs) forming a closed ring and the N-terminal domains (NTDs) forming a dynamic, open ring. Here, the crystal structure of HP0525 in complex with a fragment of HP1451, a protein of previously unknown function, is reported. The HP1451 construct consists of two domains similar to nucleic acid-binding domains. Two HP1451 molecules bind to the HP0525 NTDs on opposite sides of the hexamer, locking it in the closed form and forming a partial lid over the HP0525 chamber. From the structure, it is suggested that HP1451 acts as an inhibitory factor of HP0525 to regulate Cag-mediated secretion, a suggestion confirmed by results of in vitro ATPase assay and in vivo pull-down experiments.


    Organizational Affiliation

    School of Crystallography, Birkbeck College, London, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cag-alfa
A, B, C, D, E, F
A, B, C, D, E, F
330Helicobacter pylori 26695Mutation(s): 0 
Gene Names: cag-alfacag-alpha
UniProt
Find proteins for Q7BK04 (Helicobacter pylori)
Explore Q7BK04 
Go to UniProtKB:  Q7BK04
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7BK04
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Hypothetical proteinG, H152Helicobacter pylori 26695Mutation(s): 0 
Gene Names: HP1451HP_1451
UniProt
Find proteins for O25990 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore O25990 
Go to UniProtKB:  O25990
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO25990
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.851α = 111.04
b = 86.9β = 95.98
c = 104.129γ = 104.94
Software Package:
Software NamePurpose
SCALAdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
MOSFLMdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-11-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Source and taxonomy, Version format compliance