Helicobacter cysteine rich protein C (HcpC)

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.202 

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This is version 1.3 of the entry. See complete history


The Crystal Structure of Helicobacter Cysteine-rich Protein C at 2.0A Resolution: Similar Peptide-binding Sites in TPR and SEL1-like Repeat Proteins

Luethy, L.Grutter, M.G.Mittl, P.R.

(2004) J Mol Biol 340: 829-841

  • DOI: https://doi.org/10.1016/j.jmb.2004.04.055
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Helicobacter pylori is a Gram-negative human pathogen that infects the gastric mucosa and causes an inflammatory process leading to gastritis, ulceration and cancer. Bacterial cell-surface and secreted proteins often play an important role in pathogen-host interactions and are thought to be selective mediators for the pathology of the infection. The Helicobacter cysteine-rich proteins (Hcp) represent a large family of secreted proteins that seem to be specific for microorganisms from the epsilon-subfamily of proteobacteria. Although significantly elevated levels of anti-Hcp antibodies were observed in many patients infected with H.pylori, details on the biological functions of Hcp proteins are sparse. Hcps belong to a large family of Sel1-like multi-repeat proteins. The crystal structure of HcpC was refined at 2.0 A resolution and revealed a super-helical topology composed of seven disulfide bridged alpha/alpha-repeats, an N-terminal capping helix and an extended C-terminal coil consisting of alternating hydrophobic and hydrophilic residues. In the crystal packing, the C-terminal coil interacts with the concave surface of a symmetry-related HcpC super-helix. A hydrophobic pocket and a cluster of negatively charged residues recognize the side-chains of Val290 and Lys287 from the C-terminal coil, respectively. The peptide nitrogen atom of His291 forms a short hydrogen bond with the side-chain of Asn66. The interactions seen in this crystal contact are strikingly similar to the peptide-binding modes of the Hsp70/Hsp90 organizing protein and the PEX5 receptor. The conservation of the peptide-binding mode suggests that HcpC might recognize its binding partner in a similar way.

  • Organizational Affiliation

    Biochemisches Institut, Universität Zürich, Winterthurer Strasse 190, 8057 Zurich, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
conserved hypothetical secreted protein273Helicobacter pylori 26695Mutation(s): 0 
Gene Names: HP1098
Find proteins for O25728 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore O25728 
Go to UniProtKB:  O25728
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO25728
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.202 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.982α = 90
b = 46.198β = 120.95
c = 76.39γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-03-30
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Refinement description