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Related Experiment Videos

Molluscum contagiosum -- a defective poxvirus?

J H Shand, P Gibson, D W Gregory

    The Journal of General Virology
    |November 1, 1976
    PubMed
    Summary

    Molluscum contagiosum virus contains a DNA-dependent RNA polymerase similar to vaccinia virus. While both viruses

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    Area of Science:

    • Virology
    • Molecular Biology
    • Biochemistry

    Background:

    • Molluscum contagiosum virus (MCV) and vaccinia virus (VACV) are poxviruses with distinct biological properties.
    • Purified preparations of MCV contain a DNA-dependent RNA polymerase (EC 2.7.7.6).
    • The properties of MCV RNA polymerase are similar but not identical to those of VACV RNA polymerase.

    Purpose of the Study:

    • To compare the properties of DNA-dependent RNA polymerase from MCV and VACV.
    • To investigate the ultraviolet inactivation kinetics of both viral RNA polymerases.
    • To examine the interferon-inducing capacities and cellular effects of MCV and VACV.

    Main Methods:

    • Purification of MCV and VACV preparations.
    • Enzymatic assays to characterize RNA polymerase activity.
    • Ultraviolet irradiation studies to assess inactivation kinetics.
    • Electron microscopy to observe viral replication and cellular interactions.
    • Analysis of cellular RNA and polypeptide synthesis in infected cells.

    Main Results:

    • MCV and VACV RNA polymerases exhibit similar ultraviolet inactivation kinetics with fast and slow components.
    • Ultraviolet irradiation inactivated interfering capacities of MCV and VACV virions.
    • Interferon-inducing capacity of MCV was slowly inactivated with first-order kinetics.
    • Electron microscopy revealed distinct intracellular behaviors: VACV replicated, while MCV appeared degraded in lysosome-like bodies.
    • Preliminary studies showed altered cytoplasmic RNA and polypeptide synthesis in VACV-infected cells, but not in MCV-infected cells.

    Conclusions:

    • MCV possesses a DNA-dependent RNA polymerase with characteristics comparable to, yet distinct from, VACV.
    • Differential intracellular fate and impact on host cell synthesis suggest significant biological differences between MCV and VACV.
    • Further research is warranted to elucidate the specific roles of these viral enzymes and their interactions with host cells.

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