An epitope residing in carbohydrate chains of a sea squirt antigen termed Gi-rep

O-Glycosidically linked oligosaccharides (Gp-1β-b) were liberated from a large size glycopeptide (GP) fraction (Gp-1) in a Pronase digest of a sea squirt antigen termed Gi-rep by the treatment with 0.1 N NaOH per 1 mol/L of NaBH 4. Gp-1β-b as well as Gp-1 and the intact antigen was capable of induci...

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Veröffentlicht in:Journal of allergy and clinical immunology 1987-07, Vol.80 (1), p.57-63
Hauptverfasser: Oka, S., Shigeta, S., Ono, K., Jyo, T.
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Sprache:eng
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Zusammenfassung:O-Glycosidically linked oligosaccharides (Gp-1β-b) were liberated from a large size glycopeptide (GP) fraction (Gp-1) in a Pronase digest of a sea squirt antigen termed Gi-rep by the treatment with 0.1 N NaOH per 1 mol/L of NaBH 4. Gp-1β-b as well as Gp-1 and the intact antigen was capable of inducing a remarkable erythema in the skin of patients with asthma with sea squirt allergy at its concentration of 10 μg/ml. N-Glycoside GP fractions (Gp-1β-a and Gp-2β) having the allergenic activity were also prepared as alkali-resistant GPs from Gp-1 and the other relatively small size GP fraction (Gp-2) of the Pronase digest, respectively, after the alkali treatment. Chemically, the three allergenically active preparations were rich in galactosamine, glucosamine, and fucose in common, although the N-linked carbohydrates were much larger in size than O-linked carbohydrates. Accordingly, it has been expected that the epitope of the sea squirt antigen corresponds to certain oligosaccharide units residing in both of the O- and N-linked carbohydrate chains of the antigen. This suggestion was consistent with the observation that the allergenic activity of Gi-rep was significantly unstable to the periodate oxidation but substantially stable not only to acid, alkali, and heat treatments but also to the enzymatic proteolysis with Pronase E.
ISSN:0091-6749
1097-6825
DOI:10.1016/S0091-6749(87)80191-4