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- W2125536646 endingPage "1953" @default.
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- W2125536646 abstract "ABSTRACT The major diagnostic antigens of Histoplasma capsulatum are the H and M antigens, pluripotent glycoproteins that elicit both humoral and T-cell-mediated immune responses. These antigens may play a role in the pathogenesis of histoplasmosis. M antigen is considered immunodominant because antibodies against it are the first precipitins to arise in acute histoplasmosis and are commonly present during all phases of infection. The biological activity of monomolecular M antigen and its ability to elicit a protective immune response to H. capsulatum are largely unknown. A molecular approach was used to identify the biological nature of M antigen, including its purification from histoplasmin, partial digestion with proteinases, and reverse-phase high-performance liquid chromatography to separate the released peptides. The amino acid sequences of the purified peptides were obtained by Edman degradation, and using degenerate oligonucleotide primers for PCR, a 321-bp fragment of the gene encoding the M antigen was amplified from genomic H. capsulatum DNA. This fragment was used to screen an H. capsulatum genomic DNA library, leading to the isolation, cloning, and sequencing of the full-length gene. The M gene consists of 2,187-bp DNA encoding a protein of 80,719 Da, which has significant homology to catalases from Aspergillus fumigatus , Aspergillus niger , and Eimericella nidulans . A cDNA was generated by reverse transcription-PCR and cloned into the expression vector pQE40. The identity of the cloned, expressed protein was confirmed by Western blotting. The recombinant fusion protein was immunoreactive with monoclonal antibodies raised against M antigen, with polyclonal mouse anti-M antiserum, and with a serum sample from a patient with histoplasmosis. The gene encoding the major immunodominant M antigen of H. capsulatum is a presumptive catalase, and the recombinant protein retains serodiagnostic activity." @default.
- W2125536646 created "2016-06-24" @default.
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- W2125536646 date "1999-04-01" @default.
- W2125536646 modified "2023-09-26" @default.
- W2125536646 title "Molecular Cloning, Characterization, and Expression of the M Antigen of <i>Histoplasma capsulatum</i>" @default.
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- W2125536646 doi "https://doi.org/10.1128/iai.67.4.1947-1953.1999" @default.
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