6AW2

Crystal structure of the HopQ-CEACAM1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

TheHelicobacter pyloriadhesin protein HopQ exploits the dimer interface of human CEACAMs to facilitate translocation of the oncoprotein CagA.

Bonsor, D.A.Zhao, Q.Schmidinger, B.Weiss, E.Wang, J.Deredge, D.Beadenkopf, R.Dow, B.Fischer, W.Beckett, D.Wintrode, P.L.Haas, R.Sundberg, E.J.

(2018) EMBO J 37

  • DOI: 10.15252/embj.201798664
  • Primary Citation of Related Structures:  
    6AVZ, 6AW1, 6AW0, 6AW3, 6AW2

  • PubMed Abstract: 
  • Helicobacter pylori infects half of the world's population, and strains that encode the cag type IV secretion system for injection of the oncoprotein CagA into host gastric epithelial cells are associated with elevated levels of cancer. ...

    Helicobacter pylori infects half of the world's population, and strains that encode the cag type IV secretion system for injection of the oncoprotein CagA into host gastric epithelial cells are associated with elevated levels of cancer. CagA translocation into host cells is dependent on interactions between the H. pylori adhesin protein HopQ and human CEACAMs. Here, we present high-resolution structures of several HopQ-CEACAM complexes and CEACAMs in their monomeric and dimeric forms establishing that HopQ uses a coupled folding and binding mechanism to engage the canonical CEACAM dimerization interface for CEACAM recognition. By combining mutagenesis with biophysical and functional analyses, we show that the modes of CEACAM recognition by HopQ and CEACAMs themselves are starkly different. Our data describe precise molecular mechanisms by which microbes exploit host CEACAMs for infection and enable future development of novel oncoprotein translocation inhibitors and H. pylori -specific antimicrobial agents.


    Organizational Affiliation

    Department of Microbiology and Immunology, University of Maryland School of Medicine, University of Maryland, Baltimore, MD, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Carcinoembryonic antigen-related cell adhesion molecule 1 A109Homo sapiensMutation(s): 0 
Gene Names: CEACAM1BGPBGP1
Find proteins for P13688 (Homo sapiens)
Explore P13688 
Go to UniProtKB:  P13688
NIH Common Fund Data Resources
PHAROS:  P13688
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HopQ B439Helicobacter pyloriMutation(s): 0 
Gene Names: hopQ
Find proteins for H6A3H4 (Helicobacter pylori)
Explore H6A3H4 
Go to UniProtKB:  H6A3H4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.67α = 90
b = 103.077β = 90
c = 112.881γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-05-16
    Type: Initial release
  • Version 1.1: 2018-07-11
    Changes: Data collection, Database references