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Isolation and immunobiochemical characterization of a major allergen (65 kDa) from Fusarium equiseti
Author(s) -
Verma J.,
Sridhara S.,
Rai D.,
Gangal S. V.
Publication year - 1998
Publication title -
allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.363
H-Index - 173
eISSN - 1398-9995
pISSN - 0105-4538
DOI - 10.1111/j.1398-9995.1998.tb03893.x
Subject(s) - isoelectric focusing , allergen , fast protein liquid chromatography , fusarium , microbiology and biotechnology , isoelectric point , glycoprotein , fungi imperfecti , biology , immunoglobulin e , molecular mass , polyacrylamide gel electrophoresis , allergy , radioallergosorbent test , chemistry , chromatography , antibody , biochemistry , immunology , botany , high performance liquid chromatography , enzyme
Fusarium equiseti is one of the most important species in the class Deuteromycetes (Fungi Imperfecti). For proper diagnosis and immunotherapy, isolation and characterization of allergens of F. equiseti are necessary. In the present study, culture filtrate (CF) extract of F. equiseti was resolved into 35–37 bands on isoelectric focusing pi (3–9) and SDS‐PAGE (mol. wt. 10–100 kDa). Most of them were glycoproteins, as identified by PAS staining. F. equiseti CF revealed 15 allergenic proteins on immunoblot with an allergic serum pool. It was fractionated into nine fractions (I–IX) on a Superose‐12 column by FPLC. Fraction IV (65 kDa) and fraction VI (25 kDa) were found to be highly allergenic by IgE ELISA. A 65‐kDa protein was observed as a major allergen because it was recognized by most of the patient sera on immunoblot. After elution from SDS‐PAGE gel, it gave two bands of pi 7.4 and 6.0. Inhibition in IgE‐binding components of F. equiseti CF with CF extracts of F. soiani and F. moniliforme by immunoprint inhibition assay indicated the allergenicity shared between the extracts of Fusarium species. Data suggested that the 65‐kDa is the major allergen in the Fusarium species and can he used for the treatment of allergic patients.