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The decrease of Ara h 2 allergenicity by glycation is determined by reducing sugar chain length and isomers.

Ping Yang1, Xumei Wang2, Hui Wang1

  • 1State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang, Jiangxi 330047, China.

Food Chemistry
|September 2, 2023
PubMed
Summary
This summary is machine-generated.

Reducing sugar chain length and isomers significantly impact peanut allergen Ara h 2 allergenicity after glycation. Ribose and galactose effectively reduced allergenicity by altering Ara h 2 structure, aiding hypoallergenic product development.

Keywords:
AllergenicityAra h 2GlycationHPLC-HCD-MS/MSIsomersReducing sugar chain length

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Area of Science:

  • Food allergy research
  • Glycobiology
  • Protein chemistry

Background:

  • Peanut allergy is a significant health concern, with Ara h 2 being a major allergen.
  • Glycation, the non-enzymatic reaction between sugars and proteins, can modify protein structure and function.
  • Understanding how different reducing sugars affect allergenicity is crucial for developing hypoallergenic food products.

Purpose of the Study:

  • To investigate the impact of reducing sugar chain length and isomers on the allergenicity of peanut protein Ara h 2 after glycation.
  • To elucidate the mechanisms by which glycation with various sugars alters Ara h 2 allergenicity.
  • To provide a theoretical basis for selecting optimal reducing sugars for creating hypoallergenic peanut products.

Main Methods:

  • Glycation of purified Ara h 2 with different reducing sugars (ribose, galactose, and its isomers).
  • Analysis of glycation sites and conformational/linear epitope changes in modified Ara h 2.
  • Assessment of the allergenicity of resulting glycation conjugates.

Main Results:

  • Ara h 2 showed higher susceptibility to glycation with shorter-chain sugars like ribose.
  • Galactose glycation resulted in more glycation sites compared to its isomers, potentially due to stereochemical differences.
  • The Ara h 2-ribose conjugate exhibited the lowest allergenicity, indicating significant reduction.
  • Galactose was more effective than its isomers in reducing Ara h 2 allergenicity, attributed to steric effects of its terminal aldehyde group.
  • Glycation with ribose led to substantial destruction of conformational epitopes and masking of linear epitopes on Ara h 2.

Conclusions:

  • Reducing sugar structure, including chain length and isomeric configuration, critically influences the glycation of Ara h 2 and subsequent allergenicity reduction.
  • Short-chain sugars like ribose and specific configurations like galactose are more effective in reducing Ara h 2 allergenicity.
  • Glycation modifies Ara h 2 by disrupting key allergenic epitopes, offering a viable strategy for developing hypoallergenic peanut ingredients.