3H1G

Crystal structure of Chey mutant T84A of helicobacter pylori


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of activated CheY1 from Helicobacter pylori.

Lam, K.H.Ling, T.K.Au, S.W.

(2010) J Bacteriol 192: 2324-2334

  • DOI: 10.1128/JB.00603-09
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Chemotaxis is an important virulence factor for Helicobacter pylori colonization and infection. The chemotactic system of H. pylori is marked by the presence of multiple response regulators: CheY1, one CheY-like-containing CheA protein (CheAY2), and ...

    Chemotaxis is an important virulence factor for Helicobacter pylori colonization and infection. The chemotactic system of H. pylori is marked by the presence of multiple response regulators: CheY1, one CheY-like-containing CheA protein (CheAY2), and three CheV proteins. Recent studies have demonstrated that these molecules play unique roles in the chemotactic signal transduction mechanisms of H. pylori. Here we report the crystal structures of BeF(3(-)-activated CheY1 from H. pylori resolved to 2.4 A. Structural comparison of CheY1 with active-site residues of BeF3(-)-bound CheY from Escherichia coli and fluorescence quenching experiments revealed the importance of Thr84 in the phosphotransfer reaction. Complementation assays using various nonchemotactic E. coli mutants and pull-down experiments demonstrated that CheY1 displays differential association with the flagellar motor in E. coli. The structural rearrangement of helix 5 and the C-terminal loop in CheY1 provide a different interaction surface for FliM. On the other hand, interaction of the CheA-P2 domain with CheY1, but not with CheY2/CheV proteins, underlines the preferential recognition of CheY1 by CheA in the phosphotransfer reaction. Our results provide the first structural insight into the features of the H. pylori chemotactic system as a model for Epsilonproteobacteria.


    Organizational Affiliation

    Centre of Protein Science and Crystallography, Department of Biochemistry, Faculty of Science, The Chinese University of Hong Kong, Hong Kong.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chemotaxis protein cheY homologA129Helicobacter pylori 26695Mutation(s): 1 
Gene Names: cheYcheY1HP_1067
Find proteins for P71403 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore P71403 
Go to UniProtKB:  P71403
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MG
Query on MG

Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.409α = 90
b = 38.062β = 107.58
c = 39.02γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
PHASERphasing
REFMACrefinement
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance