5LP2

Adhesin domain of the type 1 HopQ of Helicobacter pylori strain G27


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Helicobacter pylori adhesin HopQ engages in a virulence-enhancing interaction with human CEACAMs.

Javaheri, A.Kruse, T.Moonens, K.Mejias-Luque, R.Debraekeleer, A.Asche, C.I.Tegtmeyer, N.Kalali, B.Bach, N.C.Sieber, S.A.Hill, D.J.Koniger, V.Hauck, C.R.Moskalenko, R.Haas, R.Busch, D.H.Klaile, E.Slevogt, H.Schmidt, A.Backert, S.Remaut, H.Singer, B.B.Gerhard, M.

(2016) Nat Microbiol 2: 16189-16189

  • DOI: https://doi.org/10.1038/nmicrobiol.2016.189
  • Primary Citation of Related Structures:  
    5LP2

  • PubMed Abstract: 

    Helicobacter pylori specifically colonizes the human gastric epithelium and is the major causative agent for ulcer disease and gastric cancer development. Here, we identify members of the carcinoembryonic antigen-related cell adhesion molecule (CEACAM) family as receptors of H. pylori and show that HopQ is the surface-exposed adhesin that specifically binds human CEACAM1, CEACAM3, CEACAM5 and CEACAM6. HopQ-CEACAM binding is glycan-independent and targeted to the N-domain. H. pylori binding induces CEACAM1-mediated signalling, and the HopQ-CEACAM1 interaction enables translocation of the virulence factor CagA into host cells and enhances the release of pro-inflammatory mediators such as interleukin-8. Based on the crystal structure of HopQ, we found that a β-hairpin insertion (HopQ-ID) in HopQ's extracellular 3+4 helix bundle domain is important for CEACAM binding. A peptide derived from this domain competitively inhibits HopQ-mediated activation of the Cag virulence pathway, as genetic or antibody-mediated abrogation of the HopQ function shows. Together, our data suggest the HopQ-CEACAM1 interaction to be a potentially promising novel therapeutic target to combat H. pylori-associated diseases.


  • Organizational Affiliation

    Institute for Medical Microbiology, Immunology and Hygiene, Technische Universität München, 81675 Munich, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HopQA [auth B],
B [auth A],
C,
D
434Helicobacter pylori G27Mutation(s): 0 
Gene Names: hopQHPG27_1120
UniProt
Find proteins for B5Z8H1 (Helicobacter pylori (strain G27))
Explore B5Z8H1 
Go to UniProtKB:  B5Z8H1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB5Z8H1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.7α = 90
b = 57.7β = 90.1
c = 285.6γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
FWOBelgiumG.0902.09

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2016-10-26
    Changes: Database references
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Refinement description