The invasin D protein fromYersinia pseudotuberculosisselectively binds the Fab region of host antibodies and affects colonization of the intestine.
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Authors
Sadana, PoojaGeyer, Rebecca
Pezoldt, Joern
Helmsing, Saskia
Huehn, Jochen

Hust, Michael
Dersch, Petra

Scrima, Andrea
Issue Date
2018-03-13
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Yersinia pseudotuberculosis is a Gram-negative bacterium and zoonotic pathogen responsible for a wide range of diseases, ranging from mild diarrhea, enterocolitis, lymphatic adenitis to persistent local inflammation. TheY. pseudotuberculosisinvasin D (InvD) molecule belongs to the invasin (InvA)-type autotransporter proteins, but its structure and function remain unknown. In this study, we present the first crystal structure of InvD, analyzed its expression and function in a murine infection model, and identified its target molecule in the host. We found that InvD is induced at 37°C and expressed in vivo2-4 days after infection, indicating that InvD is a virulence factor. During infection, InvD was expressed in all parts of the intestinal tract, but not in deeper lymphoid tissues. The crystal structure of the C-terminal adhesion domain of InvD revealed a distinct Ig-related fold, that, apart from the canonical β-sheets, comprises various modifications of and insertions into the Ig-core structure. We identified the Fab fragment of host-derived IgG/IgA antibodies as the target of the adhesion domain. Phage display panning and flow cytometry data further revealed that InvD exhibits a preferential binding specificity toward antibodies with VH3/VK1 variable domains and that it is specifically recruited to a subset of B cells. This finding suggests that InvD modulates Ig functions in the intestine and affects direct interactions with a subset of cell surface-exposed B-cell receptors. In summary, our results provide extensive insights into the structure of InvD and its specific interaction with the target molecule in the host.Citation
The invasin D protein fromYersinia pseudotuberculosisselectively binds the Fab region of host antibodies and affects colonization of the intestine. 2018 J. Biol. Chem.Affiliation
Helmholtz-Zentrum für Infektionsforschung GmbH, Inhoffenstr. 7, 38124 Braunschweig, Germany.PubMed ID
29535184Type
ArticleLanguage
enISSN
1083-351Xae974a485f413a2113503eed53cd6c53
10.1074/jbc.RA117.001068
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Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-sa/4.0/
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