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J Allergy Clin Immunol. 2002 Jul;110(1):160-6.

Ana o 1, a cashew (Anacardium occidental) allergen of the vicilin seed storage protein family.

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  • 1Department of Biological Science, Florida State University, Tallahassee, Fla, USA.

Abstract

BACKGROUND:

The allergens responsible for cashew food allergy have not been well characterized.

OBJECTIVES:

We initiated a study to clone cDNAs encoding cashew food allergens.

METHODS:

A cashew cDNA library was screened with human serum for IgE-reactive clones and rabbit IgG anti-cashew extract antisera. Reactive clones were sequenced and expressed, and linear epitopes were identified by means of solid-phase overlapping peptide analysis. Immunoblot inhibition was used to identify the native peptide in cashew extract.

RESULTS:

Four closely related clones reactive with both human and rabbit antisera were sequenced. Sequence analysis showed that these encode members of the vicilin/sucrose-binding protein family of plant seed storage proteins. Screening of the recombinant protein with sera from 20 patients with cashew allergy and 8 cashew-tolerant patients with allergies to other tree nuts showed that 50% and 25% of sera from patients with cashew allergy and cashew-tolerant subjects, respectively, bound the recombinant protein. The corresponding native allergen protein, designated Ana o 1, was located at approximately 50 kd. Epitope mapping revealed 11 linear IgE-binding epitopes, of which 3 appear to be immunodominant. None of the epitopes were shared in common with those of the peanut vicilin allergen Ara h 1.

CONCLUSION:

Ana o 1, a vicilin-like protein, is a major food allergen in cashews. Cashew and peanut vicilins do not share linear epitopes.

PMID:
12110836
[PubMed - indexed for MEDLINE]
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