Structural and antigenic properties of thermally treated gluten proteins

•Unfolding events of gluten proteins were mainly registered when heating up to 80°C.•At temperatures over 80°C partial proteins refolding and aggregation was noticed.•The antigenic potential of gluten proteins was significantly reduced at 100°C.•In silico tests indicated that ω5-gliadin has the lowe...

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Bibliographic Details
Published in:Food chemistry 2018-11, Vol.267, p.43-51
Main Authors: Stănciuc, Nicoleta, Banu, Iuliana, Bolea, Carmen, Patraşcu, Livia, Aprodu, Iuliana
Format: Article
Language:English
Subjects:
Antigenicity
Antigens - chemistry
Antigens - immunology
Conformational changes
Enzyme-Linked Immunosorbent Assay
Epitopes - chemistry
Epitopes - immunology
Gliadin - chemistry
Gliadin - immunology
Gliadins
Glutenins
Glutens - chemistry
Glutens - immunology
Molecular Dynamics Simulation
Protein Conformation
Protein Denaturation
Spectrometry, Fluorescence
Temperature
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Summary:•Unfolding events of gluten proteins were mainly registered when heating up to 80°C.•At temperatures over 80°C partial proteins refolding and aggregation was noticed.•The antigenic potential of gluten proteins was significantly reduced at 100°C.•In silico tests indicated that ω5-gliadin has the lowest thermal stability.•Conformational epitopes of gliadins vary with the temperature. The present study is focused on heat-induced changes in the structure and antigenic properties of gluten proteins. The thermal dependent behavior of glutenins and gliadins was analyzed through intrinsic fluorescence parameters, phase diagram method, and quenching experiments using acrylamide and iodide. Unfolding events were registered in the phase diagram of glutenins up to 80°C, followed by partial refolding and aggregation at even higher temperatures. The gliadins structure appeared to be progressively disorganized with the temperature increase up to 100°C. The thermally denatured proteins exposed different functional groups leading to 64% reduction of the antigenic properties. No significant differences in terms of residual antigenicity were observed among samples treated at temperatures over 60°C for 20 or 60min. Finally, changes in the linear epitopes exposure and location of conformational epitopes of α-/β-, γ- and ω5-gliadins were highlighted after performing molecular dynamics simulations to heat the proteins from 25°C to 100°C.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2017.03.018