2PT7

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


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

  • 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 compon ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cag-alfa
A, B, C, D, E, F
330Helicobacter pyloriMutation(s): 0 
Gene Names: cag-alfa (cag-alpha, cagAlpha, virB11)
Find proteins for Q7BK04 (Helicobacter pylori)
Go to UniProtKB:  Q7BK04
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Hypothetical protein
G, H
152Helicobacter pylori (strain ATCC 700392 / 26695)Mutation(s): 0 
Find proteins for O25990 (Helicobacter pylori (strain ATCC 700392 / 26695))
Go to UniProtKB:  O25990
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.230 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 86.851α = 111.04
b = 86.900β = 95.98
c = 104.129γ = 104.94
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
MOLREPphasing
ADSCdata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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