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Taxonomic group: plant / Streptophyta (Phylum: Streptophyta)

NCBI PubMed ID: 10932086
Publication DOI: 10.1067/mai.2000.108711
Journal NLM ID: 1275002
Publisher: St Louis, Mosby
Institutions: Department of Allergology, Paul-Ehrlich-Institut, Langen, Germany, Allergy Unit, Department of Allergology, Universitätsspital, Zürich, Switzerland

Recently, for the first time, allergy to celery was confirmed by double-blind placebo-controlled food challenge (DBPCFC). Api g 1, Api g 4, cross-reactive carbohydrate determinants (CCD), and a 60 kDa allergen have been described as celery allergens. Objective: To get insights in IgE responses of patients with a positive DBPCFC to celery tuber (celeriac) compared with patients with a negative challenge test. Methods: Specific IgE to native and heated celery tuber and to recombinant Api g 1, the major celery allergen, were determined by enzyme allergosorbent test and immunoblotting. IgE binding to Api g 1, Api g 4, and CCD was confirmed by inhibition experiments that used recombinant Api g 1, recombinant Api g 4, pure N-glycans, and extracts of celeriac, lychee fruit, and pollens of birch, mugwort, and timothy grass as inhibitors. Results: Immunoblotting with sera from 22 patients with a positive DBPCFC to celeriac confirmed the presence of known allergenic structures: The major allergen Api g 1 (16 kDa) was recognized by IgE from 13 of 22 patients (59%). Another major allergen was CCD, determined by IgE reactivity in 12 of 22 patients (55%). Celery profilin, Api g 4, was recognized by IgE from 5 of 22 patients (23%). Conclusion: Our DBPCFC-positive patients exclusively presented IgE to known celery allergens, although the prevalences were slightly different than were previously reported. No obvious differences were found in patients with positive IgE antibody but negative challenge test. IgE binding to all 3 structures in celeriac extract was inhibited by birch pollen extract, whereas mugwort pollen extract could only inhibit IgE reactivity to Api g 4 and CCD. Inhibition experiments with a purified carbohydrate moiety clearly showed that the IgE epitope mannose-xylose-fucose-glycan (Manα1-6[Xylβ1-2]Manβ1-4GlcNAcβ1-4[Fucα1-3]GlcNAc) or a closely related structure is present in celeriac extract and is important in patients with clinical allergy to celery. (J Allergy Clin Immunol 2000;106:390-9.)

carbohydrate epitopes, immunoblotting, IgE, celery allergy, double-blind placebo-controlled food challenge, Api g 1, Api g 4, cross-reactive carbohydrate determinants, enzyme allergosorbent test

Structure type: oligomer
Location inside paper: abstract
Compound class: oligosaccharide, epitope
Contained glycoepitopes: IEDB_114701,IEDB_115005,IEDB_115015,IEDB_130701,IEDB_135813,IEDB_136045,IEDB_137340,IEDB_137485,IEDB_141793,IEDB_141807,IEDB_142489,IEDB_144562,IEDB_144983,IEDB_145668,IEDB_145669,IEDB_148491,IEDB_148493,IEDB_149135,IEDB_150092,IEDB_151531,IEDB_152206,IEDB_152214,IEDB_153212,IEDB_167188,IEDB_174332,IEDB_174333,IEDB_983930,SB_198,SB_44,SB_67,SB_72,SB_74,SB_85,SB_86

Methods: biological assays
Biological activity: compound is important in patients with clinical allergy to celery

NCBI Taxonomy refs (TaxIDs): 4045
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There are 2 chemically distinct structures. Please, select:

CC(=O)N[C@H]1[C@H](O[C@@H]2[C@@H](CO)O[C@@H](O)[C@H](NC(C)=O)[C@H]2O[C@H]2O[C@H](C)[C@H](O)[C@H](O)[C@H]2O)O[C@H](CO)[C@@H](O[C@@H]2O[C@H](CO[C@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]3O)[C@@H](O)[C@H](O)[C@@H]2O[C@@H]2OC[C@@H](O)[C@H](O)[C@H]2O)[C@@H]1O

SVG MW SMILES 3D mol Ionize