Background The cleavage and the digestion patterns of allergenic proteins play a key role in allergenicity. The transformation of food proteins starts with their denaturation by the acidic environment of the stomach. However, protein denaturation is not enough to completely remove allergenic properties of a protein, but it is necessary a complete enzymatic digestion. Whether the enzymatic digestion is not efficient, the persistence of bigger peptides can occur and put the basis for the development of the sensitization process.The hypothesis of the current work takes into consideration the probability that shrimp tropomyosin (TM) is not fully digested or presents a digestion pattern that generates some peptides that can be immunogenic.Therefore, the work plan designed, aims to study the cleavage pattern of: purified chicken TM, recombinant chicken TM, purified TM of Penaeus monodon (Pen m 1), recombinant TM of Penaeus monodon (rPen m 1) and recombinant TM of Crangon crangon (rCrac c 1). Methods One mg of each ortholog has been processed through simulated mouth, gastric and intestinal digestion. The sample was frozen to block the digestion and, after this step, concentrated and cleaned through protein precipitation. The protein pellet was processed for peptidomic analysis through 1D Tricine gel electrophoresis, 2D Tricine gel electrophoresis and mass spectrometry. Results Simulated gastric digestion pattern of shrimp TM highlighted the presence of a resistant band at an average MW of 25 kDa that could be involved in the immunogenic process. Conclusions This innovative approach (peptidomics study through 1D-2D Tricine/MS) could represent a milestone for the study of digestion patterns of allergenic proteins or for the study of allergenic potential of novel foods.

Peptidomics characterization of allergenic and non-allergenic tropomyosin orthologs / C. Piras, A. Soggiu, L. Bonizzi, K. Takács, N. Andras, É. Gelencsér, H. Thomas, C. Joana, K. Annette, H. Karin, U. Andrea, G. Viviana, F. Ria, A. Chiara, R. Paola. ((Intervento presentato al 16. convegno Human Proteome Organization World Congress tenutosi a Dublin nel 2017.

Peptidomics characterization of allergenic and non-allergenic tropomyosin orthologs

C. Piras
;
A. Soggiu;L. Bonizzi;F. Ria;
2017

Abstract

Background The cleavage and the digestion patterns of allergenic proteins play a key role in allergenicity. The transformation of food proteins starts with their denaturation by the acidic environment of the stomach. However, protein denaturation is not enough to completely remove allergenic properties of a protein, but it is necessary a complete enzymatic digestion. Whether the enzymatic digestion is not efficient, the persistence of bigger peptides can occur and put the basis for the development of the sensitization process.The hypothesis of the current work takes into consideration the probability that shrimp tropomyosin (TM) is not fully digested or presents a digestion pattern that generates some peptides that can be immunogenic.Therefore, the work plan designed, aims to study the cleavage pattern of: purified chicken TM, recombinant chicken TM, purified TM of Penaeus monodon (Pen m 1), recombinant TM of Penaeus monodon (rPen m 1) and recombinant TM of Crangon crangon (rCrac c 1). Methods One mg of each ortholog has been processed through simulated mouth, gastric and intestinal digestion. The sample was frozen to block the digestion and, after this step, concentrated and cleaned through protein precipitation. The protein pellet was processed for peptidomic analysis through 1D Tricine gel electrophoresis, 2D Tricine gel electrophoresis and mass spectrometry. Results Simulated gastric digestion pattern of shrimp TM highlighted the presence of a resistant band at an average MW of 25 kDa that could be involved in the immunogenic process. Conclusions This innovative approach (peptidomics study through 1D-2D Tricine/MS) could represent a milestone for the study of digestion patterns of allergenic proteins or for the study of allergenic potential of novel foods.
ott-2017
Settore VET/05 - Malattie Infettive degli Animali Domestici
Settore BIO/10 - Biochimica
Settore VET/04 - Ispezione degli Alimenti di Origine Animale
Peptidomics characterization of allergenic and non-allergenic tropomyosin orthologs / C. Piras, A. Soggiu, L. Bonizzi, K. Takács, N. Andras, É. Gelencsér, H. Thomas, C. Joana, K. Annette, H. Karin, U. Andrea, G. Viviana, F. Ria, A. Chiara, R. Paola. ((Intervento presentato al 16. convegno Human Proteome Organization World Congress tenutosi a Dublin nel 2017.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/554362
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