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Related Experiment Videos

Differentiation between SV40 large-T and U antigenic sites.

J A Robb

    The Journal of General Virology
    |February 1, 1979
    PubMed
    Summary

    SV40 large-T and U antigen processing was studied in monkey cells. Mutant infections at higher temperatures altered protein processing, affecting antigen site integrity.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Immunology

    Background:

    • SV40 (Simian Virus 40) large-T antigen is crucial for viral replication and transformation.
    • Understanding the processing and antigenic sites of viral proteins is key to deciphering viral mechanisms.

    Purpose of the Study:

    • To investigate the SV40 large-T and U antigenic sites on proteins during wild type and tsA58 mutant infections.
    • To determine how temperature affects the processing of these viral proteins and their antigenic sites.

    Main Methods:

    • Radioimmune precipitation
    • SDS-polyacrylamide slab gel electrophoresis
    • Fluorography
    • Analysis of protein species synthesized in TC7 monkey cells.

    Main Results:

    • Wild type and tsA58 mutant infections at permissive temperatures produced three protein species (84-94 kDa) with both large-T and U antigenic sites.
    • tsA58 mutant infection at a non-permissive temperature yielded four additional species (60-74 kDa) containing large-T but not U antigenic sites.
    • A subpopulation of the 74 kDa species retained both antigenic sites.

    Conclusions:

    • The COOH-terminal region, associated with the U antigenic site, is more susceptible to processing (likely proteolytic cleavage) than the large-T antigenic site region.
    • Temperature-sensitive mutations in SV40 can differentially affect the processing of viral proteins, impacting antigenic site integrity.

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