Efficient chemo-enzymatic gluten detoxification: reducing toxic epitopes for celiac patients improving functional...

Area of Science:

• Food Science
• Biochemistry
• Allergy Research

Background:

• Celiac disease is triggered by gluten, a protein found in wheat.
• Current treatments for celiac disease include strict gluten avoidance, pharmacological interventions, or genetic modification of wheat.
• Detoxifying gluten's toxic epitopes via protein engineering offers a promising alternative.

Purpose of the Study:

• To develop a simple and efficient chemo-enzymatic methodology for gluten detoxification.
• To decrease the celiac disease-inducing epitopes in gluten proteins.
• To improve the technological and functional properties of gluten.

Main Methods:

• Utilized microbial transglutaminase (mTG) for transamidation of gluten.
• Employed n-butylamine as an amine nucleophile under varying conditions (reducing vs. non-reducing, varying concentrations).
• Analyzed the impact of reaction conditions on epitope reduction, protein cross-linking, and gluten hydrophobicity.

Main Results:

• Low amine concentrations under non-reducing conditions primarily led to mTG-mediated gluten cross-linking.
• High amine concentrations significantly reduced protein cross-linking.
• Reducing conditions enhanced transamidation by 7-fold, substantially decreasing toxic epitopes.
• Incorporation of n-butylamine improved gluten hydrophobicity, strengthening the gluten network.

Conclusions:

• The developed chemo-enzymatic method effectively reduces toxic gluten epitopes.
• This approach enhances gluten's technological value, improving its hydrophobicity and network strength.
• The findings enable the production of hypoallergenic flours while preserving gluten's unique viscoelastic properties.