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Int. J. Mol. Sci. 2017, 18(8), 1780; doi:10.3390/ijms18081780

Endolysosomal Degradation of Allergenic Ole e 1-Like Proteins: Analysis of Proteolytic Cleavage Sites Revealing T Cell Epitope-Containing Peptides

1
Department of Molecular Biology, University of Salzburg, Salzburg 5020, Austria
2
Christian Doppler Laboratory for Biosimilar Characterization, University of Salzburg, Salzburg 5020, Austria
3
Departamento Bioquímica y Biología Molecular I, Universidad Complutense, Madrid 28040, Spain
4
Thermo Fisher Scientific, Uppsala 75450, Sweden
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 22 May 2017 / Revised: 27 July 2017 / Accepted: 3 August 2017 / Published: 16 August 2017
(This article belongs to the Special Issue Proteolysis in Allergic Sensitization and Th2 Response)
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Abstract

Knowledge of the susceptibility of proteins to endolysosomal proteases provides valuable information on immunogenicity. Though Ole e 1-like proteins are considered relevant allergens, little is known about their immunogenic properties and T cell epitopes. Thus, six representative molecules, i.e., Ole e 1, Fra e 1, Sal k 5, Che a 1, Phl p 11 and Pla l 1, were investigated. Endolysosomal degradation and peptide generation were simulated using microsomal fractions of JAWS II dendritic cells. Kinetics and peptide patterns were evaluated by gel electrophoresis and mass spectrometry. In silico MHC (major histocompatibility complex) class II binding prediction was performed with ProPred. Cleavage sites were assigned to the primary and secondary structure, and in silico docking experiments between the protease cathepsin S and Ole e 1 were performed. Different kinetics during endolysosomal degradation were observed while similar peptide profiles especially at the C-termini were detected. Typically, the identified peptide clusters comprised the previously-reported T cell epitopes of Ole e 1, consistent with an in silico analysis of the T cell epitopes. The results emphasize the importance of the fold on allergen processing, as also reflected by conserved cleavage sites located within the large flexible loop. In silico docking and mass spectrometry results suggest that one of the first Ole e 1 cleavages might occur at positions 107–108. Our results provided kinetic and structural information on endolysosomal processing of Ole e 1-like proteins. View Full-Text
Keywords: Ole e 1-like proteins; endolysosomal degradation; homology modeling; docking experiments; cathepsin S; T cell epitope Ole e 1-like proteins; endolysosomal degradation; homology modeling; docking experiments; cathepsin S; T cell epitope
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Wildner, S.; Elsässer, B.; Stemeseder, T.; Briza, P.; Soh, W.T.; Villalba, M.; Lidholm, J.; Brandstetter, H.; Gadermaier, G. Endolysosomal Degradation of Allergenic Ole e 1-Like Proteins: Analysis of Proteolytic Cleavage Sites Revealing T Cell Epitope-Containing Peptides. Int. J. Mol. Sci. 2017, 18, 1780.

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