Multiple roles of Bet v 1 ligands in allergen stabilization and modulation of endosomal protease activity.

Abstract:

BACKGROUND:Over 100 million people worldwide suffer from birch pollen allergy. Bet v 1 has been identified as the major birch pollen allergen. However, the molecular mechanisms of birch allergic sensitization, including the roles of Bet v 1 and other components of the birch pollen extract, remain incompletely understood. Here, we examined how known birch pollen-derived molecules influence the endolysosomal processing of Bet v 1, thereby shaping its allergenicity. METHODS:We analyzed the biochemical and immunological interaction of ligands with Bet v 1. We then investigated the proteolytic processing of Bet v 1 by endosomal extracts in the presence and absence of ligands, followed by a detailed kinetic analysis of Bet v 1 processing by individual endolysosomal proteases as well as the T-cell epitope presentation in BMDCs. RESULTS:We identified E1 phytoprostanes as novel Bet v 1 ligands. Pollen-derived ligands enhanced the proteolytic resistance of Bet v 1, affecting degradation kinetics and preferential cleavage sites of the endolysosomal proteases cathepsin S and legumain. E1 phytoprostanes exhibited a dual role by stabilizing Bet v 1 and inhibiting cathepsin protease activity. CONCLUSION:Bet v 1 can serve as a transporter of pollen-derived, bioactive compounds. When carried to the endolysosome, such compounds can modulate the proteolytic activity, including its processing by cysteine cathepsins. We unveil a paradigm shift from an allergen-centered view to a more systemic view that includes the host endolysosomal enzymes.

journal_name

Allergy

journal_title

Allergy

authors

Soh WT,Aglas L,Mueller GA,Gilles S,Weiss R,Scheiblhofer S,Huber S,Scheidt T,Thompson PM,Briza P,London RE,Traidl-Hoffmann C,Cabrele C,Brandstetter H,Ferreira F

doi

10.1111/all.13948

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

2382-2393

issue

12

eissn

0105-4538

issn

1398-9995

journal_volume

74

pub_type

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