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Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S

Birch pollen allergy affects more than 20% of the European allergic population. On a molecular level, birch pollen allergy can be linked to the two dominant allergens Bet v 1 and Bet v 2. Bet v 2 belongs to the profilin family, which is abundant in the plant kingdom. Importantly, the homologous plan...

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Autores principales: Soh, Wai Tuck, Briza, Peter, Dall, Elfriede, Asam, Claudia, Schubert, Mario, Huber, Sara, Aglas, Lorenz, Bohle, Barbara, Ferreira, Fatima, Brandstetter, Hans
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666837/
https://www.ncbi.nlm.nih.gov/pubmed/29035299
http://dx.doi.org/10.3390/ijms18102156
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author Soh, Wai Tuck
Briza, Peter
Dall, Elfriede
Asam, Claudia
Schubert, Mario
Huber, Sara
Aglas, Lorenz
Bohle, Barbara
Ferreira, Fatima
Brandstetter, Hans
author_facet Soh, Wai Tuck
Briza, Peter
Dall, Elfriede
Asam, Claudia
Schubert, Mario
Huber, Sara
Aglas, Lorenz
Bohle, Barbara
Ferreira, Fatima
Brandstetter, Hans
author_sort Soh, Wai Tuck
collection PubMed
description Birch pollen allergy affects more than 20% of the European allergic population. On a molecular level, birch pollen allergy can be linked to the two dominant allergens Bet v 1 and Bet v 2. Bet v 2 belongs to the profilin family, which is abundant in the plant kingdom. Importantly, the homologous plant profilins have a conserved cysteine motif with a currently unknown functional relevance. In particular, it is unknown whether the motif is relevant for disulfide formation and to what extent it would affect the profilins’ structural, functional and immunological properties. Here we present crystal structures of Bet v 2 in the reduced and the oxidized state, i.e., without and with a disulfide bridge. Despite overall structural similarity, the two structures distinctly differ at their termini which are stabilized to each other in the oxidized, i.e., disulfide-linked state. These structural differences translate into differences in their proteolytic resistance. Whereas the oxidized Bet v 2 is rather resistant towards the endolysosomal protease cathepsin S, it is rapidly degraded in the reduced form. By contrast, both Bet v 2 forms exhibit similar immunological properties as evidenced by their binding to IgE antibodies from birch pollen allergic patients and by their ability to trigger histamine release in a humanized rat basophilic leukemia cells (RBL) assay, independent of the presence or absence of the disulfide bridge. Taken together our findings suggest that the oxidized Bet v 2 conformation should be the relevant species, with a much longer retention time to trigger immune responses.
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spelling pubmed-56668372017-11-09 Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S Soh, Wai Tuck Briza, Peter Dall, Elfriede Asam, Claudia Schubert, Mario Huber, Sara Aglas, Lorenz Bohle, Barbara Ferreira, Fatima Brandstetter, Hans Int J Mol Sci Article Birch pollen allergy affects more than 20% of the European allergic population. On a molecular level, birch pollen allergy can be linked to the two dominant allergens Bet v 1 and Bet v 2. Bet v 2 belongs to the profilin family, which is abundant in the plant kingdom. Importantly, the homologous plant profilins have a conserved cysteine motif with a currently unknown functional relevance. In particular, it is unknown whether the motif is relevant for disulfide formation and to what extent it would affect the profilins’ structural, functional and immunological properties. Here we present crystal structures of Bet v 2 in the reduced and the oxidized state, i.e., without and with a disulfide bridge. Despite overall structural similarity, the two structures distinctly differ at their termini which are stabilized to each other in the oxidized, i.e., disulfide-linked state. These structural differences translate into differences in their proteolytic resistance. Whereas the oxidized Bet v 2 is rather resistant towards the endolysosomal protease cathepsin S, it is rapidly degraded in the reduced form. By contrast, both Bet v 2 forms exhibit similar immunological properties as evidenced by their binding to IgE antibodies from birch pollen allergic patients and by their ability to trigger histamine release in a humanized rat basophilic leukemia cells (RBL) assay, independent of the presence or absence of the disulfide bridge. Taken together our findings suggest that the oxidized Bet v 2 conformation should be the relevant species, with a much longer retention time to trigger immune responses. MDPI 2017-10-16 /pmc/articles/PMC5666837/ /pubmed/29035299 http://dx.doi.org/10.3390/ijms18102156 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Soh, Wai Tuck
Briza, Peter
Dall, Elfriede
Asam, Claudia
Schubert, Mario
Huber, Sara
Aglas, Lorenz
Bohle, Barbara
Ferreira, Fatima
Brandstetter, Hans
Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S
title Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S
title_full Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S
title_fullStr Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S
title_full_unstemmed Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S
title_short Two Distinct Conformations in Bet v 2 Determine Its Proteolytic Resistance to Cathepsin S
title_sort two distinct conformations in bet v 2 determine its proteolytic resistance to cathepsin s
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666837/
https://www.ncbi.nlm.nih.gov/pubmed/29035299
http://dx.doi.org/10.3390/ijms18102156
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