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Bunyamwera virus-induced polypeptide synthesis

T H Pennington, C R Pringle, M A McCrae

    Journal of Virology
    |October 1, 1977
    PubMed
    Summary

    Bunyamwera virus infection in BSC-1 cells produces four distinct polypeptides (L, G1, G2, N). These viral proteins are synthesized throughout the infection cycle, with no evidence of proteolytic processing.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Cell Biology

    Background:

    • Bunyamwera virus is an RNA virus that can cause disease in humans.
    • Understanding virus-induced protein synthesis is crucial for developing antiviral therapies.

    Purpose of the Study:

    • To identify and characterize Bunyamwera virus-induced polypeptides in infected cells.
    • To investigate the synthesis kinetics and processing of these viral proteins.

    Main Methods:

    • Polyacrylamide gel electrophoresis and autoradiography were used to identify viral polypeptides.
    • Pulse-chase experiments, short labeling, and amino acid analog studies were performed to assess protein processing.
    • Kinetics of polypeptide synthesis were analyzed over time.

    Main Results:

    • Four Bunyamwera virus-induced polypeptides were identified with molecular weights of 200x10^6 (L), 128x10^6 (G1), 31x10^6 (G2), and 23x10^6 (N).
    • No evidence of proteolytic cleavage or processing was observed for these polypeptides.
    • Polypeptides L and N showed rapid synthesis peaks followed by decline, while G1 and G2 exhibited sustained synthesis before declining.

    Conclusions:

    • Bunyamwera virus infection leads to the synthesis of four specific polypeptides in BSC-1 cells.
    • These viral polypeptides are not processed via proteolytic cleavage.
    • The synthesis kinetics suggest distinct temporal regulation of viral protein production during infection.

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