The human gastric pathogen <i>Helicobacter pylori </i> is a major causative agent of gastritis, peptic ulcer disease, and gastric cancer. As part of its adhesive lifestyle, the bacterium targets members of the carcinoembryonic antigen-related cell a ...
The human gastric pathogen Helicobacter pylori is a major causative agent of gastritis, peptic ulcer disease, and gastric cancer. As part of its adhesive lifestyle, the bacterium targets members of the carcinoembryonic antigen-related cell adhesion molecule (CEACAM) family by the conserved outer membrane adhesin HopQ. The HopQ-CEACAM1 interaction is associated with inflammatory responses and enables the intracellular delivery and phosphorylation of the CagA oncoprotein via a yet unknown mechanism. Here, we generated crystal structures of HopQ isotypes I and II bound to the N-terminal domain of human CEACAM1 (C1ND) and elucidated the structural basis of H. pylori specificity toward human CEACAM receptors. Both HopQ alleles target the β-strands G, F, and C of C1ND, which form the trans dimerization interface in homo- and heterophilic CEACAM interactions. Using SAXS, we show that the HopQ ectodomain is sufficient to induce C1ND monomerization and thus providing H. pylori a route to influence CEACAM-mediated cell adherence and signaling events.
Organizational Affiliation:
Structural and Molecular Microbiology, Structural Biology Research Center, VIB, Brussels, Belgium han.remaut@vub.be.,Imevax GmbH, Munich, Germany.,Structural Biology Brussels, Vrije Universiteit Brussel, Brussels, Belgium.,German Center for Infection Research, Partner Site Munich, Munich, Germany.,Division of Microbiology, Department of Biology, Friedrich Alexander University Erlangen, Erlangen, Germany.,Institute of Anatomy, Medical Faculty, University of Duisburg-Essen, Essen, Germany.,Institute of Immunology, Friedrich-Loeffler Institut, Greifswald-Insel Riems, Germany.,Institute for Medical Microbiology, Immunology and Hygiene, Technische Universität München, Munich, Germany.,Structural and Molecular Microbiology, Structural Biology Research Center, VIB, Brussels, Belgium.
Download Mendeley
Download Endnote
