Changes in Protein Secondary Structure during Gluten Deformation Studied by Dynamic Fourier Transform Infrared Spectroscopy

Nikolaus Wellner, E. N. Clare Mills, Geoff Brownsey, Reginald H. Wilson, Neil Brown, Jacqueline Freeman, Nigel G. Halford, Peter R. Shewry, Peter Belton

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206 Citations (Scopus)

Abstract

Fourier transform infrared (FT-IR) spectroscopy was used to monitor changes in the secondary structure of wheat prolamins, the main components of gluten, during mechanical deformation in a series of cycles of extension and relaxation. A sample derived from protein bodies isolated from developing grain showed a buildup of persistent ß-sheet structure. In gluten, the ratio of ß-sheet to random and ß-turn structures changed on extension. After the applied force was released, the sample recovered some of its original shape and structure, but the material became stiffer in consecutive extension cycles. The relationship between gluten structure and mechanical properties is discussed in terms of a model in which conversion of ß-turn to ß-sheet structure is a response to extension and a means by which elastic energy is stored in the system.
Original languageEnglish
Pages (from-to)255-261
Number of pages7
JournalBiomacromolecules
Volume6
Issue number1
DOIs
Publication statusPublished - 2005

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