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Am. J. Respir. Crit. Care Med., Volume 156, Number 6, December 1997, 1956-1962

Allergens of Aspergillus fumigatus and Candida boidinii Share IgE-binding Epitopes

STEFANIE HEMMANN, KURT BLASER, and RETO CRAMERI

Swiss Institute of Allergy and Asthma Research, Davos, Switzerland

From an Aspergillus fumigatus complementary deoxyribonucleic acid (cDNA) library displayed on phage surface, an allergen formally termed rAsp f 3 was cloned. The open-reading frame of the cloned gene for the allergen encodes a protein of 168 amino acids with a predicted molecular mass of 18.5 kD, showing 36% identity and 58% similarity to two peroxisomal membrane proteins of Candida boidinii. Recombinant Asp f 3 was expressed as a [His]6-tagged fusion protein in Escherichia coli at yields of 30 mg/L, and was purified by Ni2+-chelate chromatography. In an enzyme-linked immunosorbent assay (ELISA), serum IgE antibody reactivity to rAsp f 3 could be detected in 72% of 89 individuals sensitized to A. fumigatus, demonstrating that the protein represents a major allergen of the mold. IgE specific to rAsp f 3 and the two recombinant Candida proteins was further demonstrated by IgE-immunoblot analysis. IgE binding to rAsp f 3 could be inhibited in the ELISA by adding either of the recombinant Candida peroxisomal proteins to sera containing IgE directed against Asp f 3. Taken together, these observations prove that the Asperigillus allergen and the two Candida proteins share IgE-binding epitopes.




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