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Isolation and characterization of polyoma nucleoprotein complexes.

R L Garcea, T L Benjamin

    Virology
    |October 15, 1983
    PubMed
    Summary

    Researchers developed a method to isolate polyoma virus complexes using neuraminidase. This technique identified distinct viral intermediates, aiding the study of polyoma virus assembly and host-range mutants.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Biochemistry

    Background:

    • Polyoma virus assembly intermediates are not well characterized.
    • Understanding viral assembly is crucial for virology and developing antiviral strategies.

    Purpose of the Study:

    • To develop a method for isolating polyoma nucleoprotein complexes.
    • To identify and characterize distinct polyoma virion assembly intermediates.

    Main Methods:

    • Neuraminidase treatment of infected cell lysates.
    • Analysis of [3H]thymidine labeling kinetics and sedimentation coefficients.
    • Characterization of complexes via precipitation and disruption assays.

    Main Results:

    • Identified three distinct polyoma virion intermediates: 95 S replicating complex, 75 S minichromosome, and 240 S virion.
    • Observed a continuum of labeled polyoma viral DNA sedimenting between 240 S and 95 S, unlike SV40.
    • Characterized complexes by neuraminidase release, antivirion antibody precipitation, and association with hemagglutinating activity.

    Conclusions:

    • The isolated intermediates represent incremental capsid protein additions during polyoma virus assembly.
    • This method facilitates the study of polyoma host-range mutants' growth defects.
    • Properties of isolated complexes suggest purification steps for further characterization.

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