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• W2024954306 abstract "Pear is known as an allergenic food involved in the 'oral allergy syndrome' which affects a high percentage of patients allergic to birch pollen. The aim of this study was to clone the major allergen of this fruit, to express it as bacterial recombinant protein and to study its allergenic properties in relation to homologous proteins and natural allergen extracts. The coding region of the cDNA was obtained by a PCR strategy, cloned, and the allergen was expressed as His-Tag fusion protein. The fusion peptide was removed by treatment with cyanogen bromide. Purified non-fusion protein was subjected to allergenicity testing by the enzyme allergosorbent test (EAST), Western blotting, competitive inhibition assays, and basophil histamine release. The deduced protein sequence shared a high degree of identity with other major allergens from fruits, nuts, vegetables, and pollen, and with a family of PR-10 pathogenesis related proteins. The recombinant (r) protein was recognised by specific IgE from sera of all pear-allergic patients (n = 16) investigated in this study. Hence, the allergen was classified as a major allergen and named Pyr c 1. The IgE binding characteristics of rPyr c 1 appeared to be similar to the natural pear protein, as was demonstrated by EAST-inhibition and Western blot-inhibition experiments. Moreover, the biological activity of rPyr c 1 was equal to that of pear extract, as indicated by basophil histamine release in two patients allergic to pears. The related major allergens Bet v 1 from birch pollen and Mal d 1 from apple inhibited to a high degree the binding of IgE to Pyr c 1, whereas Api g 1 from celery, also belonging to this family, had little inhibitory effects, indicating epitope differences between Bet v 1-related food allergens. Unlimited amounts of pure rPyr c 1 are now available for studies on the structure and epitopes of pollen-related food allergens. Moreover, the allergen may serve as stable and standardised diagnostic material." @default.
• W2024954306 created "2016-06-24" @default.
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• W2024954306 date "2001-05-01" @default.
• W2024954306 modified "2023-10-16" @default.
• W2024954306 title "Pyr c 1, the major allergen from pear (Pyrus communis), is a new member of the Bet v 1 allergen family" @default.
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• W2024954306 doi "https://doi.org/10.1016/s0378-4347(01)00087-1" @default.
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