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Rapid decrease in the levels of the double-stranded RNA-dependent protein kinase during virus infections.

A G Hovanessian, J Galabru, E Meurs

    Virology
    |July 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

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    Interferon treatment enhances double-stranded RNA-dependent protein kinase (p68 kinase) levels. However, virus infection rapidly decreases p68 kinase, indicating its activation and subsequent degradation during viral replication.

    Area of Science:

    • Biochemistry
    • Virology
    • Immunology

    Background:

    • The double-stranded RNA-dependent protein kinase (p68 kinase) is a key mediator of the interferon antiviral response.
    • Its expression is significantly upregulated by interferon treatment in human cells.

    Purpose of the Study:

    • To investigate the phosphorylation and steady-state levels of p68 kinase during various virus infections.
    • To understand the regulation of p68 kinase activity and stability in response to viral challenge.

    Main Methods:

    • Utilized a monoclonal antibody specific for p68 kinase.
    • Monitored p68 kinase phosphorylation and protein levels in interferon-treated cells infected with encephalomyocarditis virus (EMCV), vesicular stomatitis virus (VSV), and vaccinia virus.
    • Assessed the half-life of p68 kinase in infected versus uninfected cells.

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    Main Results:

    • p68 kinase is phosphorylated (activated) in cells infected with EMCV, VSV, and vaccinia virus, even after interferon treatment.
    • Despite activation, p68 kinase levels rapidly decrease in virus-infected cells, with a reduced half-life (2-3 hr vs. 6-7 hr).
    • This decrease is virus dose-dependent and specific, as other cellular proteins and 2'-5'-oligoadenylate synthetase activity remain unaffected.

    Conclusions:

    • Virus infection leads to the activation and subsequent rapid degradation of p68 kinase, overriding interferon-induced upregulation.
    • This suggests a mechanism by which viruses may evade the host antiviral state mediated by p68 kinase.
    • The observed decrease in p68 kinase levels during viral infection is a conserved phenomenon across different RNA and DNA viruses.