5LP2

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 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: 10.1038/nmicrobiol.2016.189

  • 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 (CEACA ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HopQ
B, A, C, D
434Helicobacter pylori (strain G27)Mutation(s): 0 
Gene Names: hopQ
Find proteins for B5Z8H1 (Helicobacter pylori (strain G27))
Go to UniProtKB:  B5Z8H1
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 57.700α = 90.00
b = 57.700β = 90.10
c = 285.600γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
PHASERphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
FWOBelgiumG.0902.09

Revision History 

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2016-10-26
    Type: Database references