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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: METHODS, RESULTS. Meshes: 2S Albumins, Plant, Allergens, Amino Acid Sequence, Antigens, Plant, Child, Child, Preschool, Circular Dichroism, Cloning, Molecular, Escherichia coli, Female, Gene Expression Regulation, Humans, Immunoglobulin E, Infant, Male, Mass Spectrometry, Molecular Sequence Data, Mutagenesis, Site-Directed, Peanut Hypersensitivity, Proteolysis, Trypsin.
user
Are trypsin resistance of the major peanut allergen Ara h 6 and allergenicity of the digestion products abolished after selective disruption of disulfide bonds? Context: 2S-albumins Ara h 2 and Ara h 6 are the most widely recognized and potent allergens for peanut-allergic patients. These allergens are particularly resistant to proteolysis and the digestion products generally retain significant allergenicity. Five disulfide bridges (DB) stabilize Ara h 6 overall structure and their influence on the trypsin resistance and on the allergenicity of the digestion products was investigated. Progressive disruption of each DB was performed by site-directed mutagenesis. Successful refolding of Ara h 6 variants was confirmed by circular dichroism. Trypsin resistance, IgE-binding capacity and allergenic potency, as assessed by in vitro mediator release assay with sera from peanut-allergic patients, was not affected by the deletion of the C-terminal DB at Cys(84) -Cys(124) . Additional disruption of DB at Cys(14) -Cys(71)  or at Cys(73) -Cys(115)  rendered Arg(16/20)  or Arg(114)  susceptible to trypsinolysis, respectively, but affected principally the IgE-binding capacity of Ara h 6. DB disruption at Cys(26) -Cys(58)  or at Cys(59) -Cys(107)  led to an extensive proteolytic degradation and a complete loss of allergenic potency of the digestion products.
assistant
Selective disruption of the DB stabilizing the protease-resistant core of Ara h 6 eliminated the IgE-binding capacity of the trypsin-degradation products and their ability to trigger mast cell degranulation. Final Decision: yes