Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/34381
Title: In Search of a Vaccine for Mouse Allergy: Significant Reduction of Mus m 1 Allergenicity by Structure-Guided Single-Point Mutations
Authors: Ferrari, Elena
Breda, Daniela
Longhi, Renato
Vangelista, Luca
Nakaie, Clovis Ryuichi [UNIFESP]
Elviri, Lisa
Casali, Emanuela
Pertinhez, Thelma A.
Spisni, Alberto
Burastero, Samuele E.
Ist Sci San Raffaele
Univ Parma
CNR
Universidade Federal de São Paulo (UNIFESP)
Keywords: Allergen mutants
Allergenicity
Allergens
Allergoid
Lipocalin
Recombinant allergens
Recombinant hypoallergenic allergens
Basophil activation test
T cell epitopes
Issue Date: 1-Jan-2012
Publisher: Karger
Citation: International Archives of Allergy and Immunology. Basel: Karger, v. 157, n. 3, p. 226-237, 2012.
Abstract: Background: Mouse urinary proteins are relevant allergens from mice urine. We used the recombinant protein Mus m 1 as an allergen model to identify if, by altering Mus m 1 architecture via single-point mutations, we could effectively modify its allergenicity. Methods: Based on structural considerations, we synthesized two single-point mutants, Mus m 1-Y120A and Mus m 1-Y120F, which were expected to harbor large structural alterations. Circular dichroism and fluorescence analysis showed significant conformational rearrangements of the aromatic side chains in the internal cavity of Mus m 1-Y120A when compared to Mus m 1-Y120F and Mus m 1. Evaluation of the allergenic potential of the recombinant molecules was performed in vitro with both immunochemical approaches and assays based on the measurement of basophil degranulation. Moreover, to assess the integrity of the T cell epitopes and as an in vitro measure of immunogenicity, we tested the reactivity of T lymphocytes from subjects allergic to mouse urine against proteins and synthetic peptides encompassing the immunodominant linear epitope containing the mutation. Results: We found that the selected point mutation was able to modulate the protein allergenicity, and to severely impair the recognition of Mus m 1 by IgE, while T cell reactivity was fully maintained. Conclusions: in silico predicted, minimum selected structural modifications allowed to design one protein with reduced allergenicity and preserved immunogenicity. Structurally guided mutations can direct the design of proteins with reduced allergenicity which can be used as vaccines for a safer and more effective immunotherapy of allergic disorders. Copyright (C) 2011 S. Karger AG, Basel
URI: http://repositorio.unifesp.br/handle/11600/34381
ISSN: 1018-2438
Other Identifiers: http://dx.doi.org/10.1159/000327551
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