Chemical and immunological characterization of the extracellular galactomannan of Aspergillus fumigatus
| Autor: | J P Debeaupuis, J. P. Latgé, M. Diaquin, H. Kobayashi, J. Sarfati, J M Wieruszeski, B Fournet, J P Bouchara, E Parra |
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| Rok vydání: | 1994 |
| Předmět: |
Antigenicity
Antigens Fungal Chromatography Gas Magnetic Resonance Spectroscopy Immunology Molecular Sequence Data Mannose Enzyme-Linked Immunosorbent Assay Microbiology Aspergillus fumigatus Mannans Galactomannan chemistry.chemical_compound Antigen Aspergillosis Humans Antibodies Fungal Mannan chemistry.chemical_classification biology Hydrolysis Galactose biology.organism_classification Immunodiffusion Infectious Diseases chemistry Carbohydrate Sequence Parasitology Glycoprotein Research Article |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 0019-9567 |
| Popis: | The galactomannan (GM) produced extracellularly by Aspergillus fumigatus has been purified by a double sequential hydrazine-nitrous acid treatment of the ethanol precipitate of the culture filtrate. Nuclear magnetic resonance and gas-liquid chromatography-mass spectrometry analysis have been performed on intact GM, acid-hydrolyzed GM, and oligomers resulting from the acetolysis of the acid-hydrolyzed GM. Results show that A. fumigatus GM is composed of a linear mannan core with an alpha-(1-2)-linked mannotetraose repeating unit attached via alpha-(1-6) linkage. Side chains composed of an average of 4 to 5 beta-(1-5)-galactofuranose units are linked to C-6 and C-3 positions of alpha-(1-2)-linked mannose units of the mannan. The immunoreactivity of GM and HCl-hydrolyzed GM was studied by use of human sera from aspergillosis patients and an antigalactofuran monoclonal antibody. The alpha-(1-2) (1-6)-mannan core is not antigenic. The immunogenic galactofuran is found amongst several exocellular glycoproteins. According to a direct enzyme-linked immunosorbent assay with GM as the detector antigen, only 26% of the serum samples from aspergilloma patients (all positive by immunodiffusion assays) give optical density values superior to a cutoff estimated as the mean +/- 3 standard deviations of values obtained with control sera. |
| Databáze: | OpenAIRE |
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