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Related Experiment Videos

Polyoma virus minichromosomes: associated DNA molecules.

M R Krauss, R M Benbow

    Journal of Virology
    |June 1, 1981
    PubMed
    Summary

    Replicating polyoma minichromosomes were studied using electron microscopy. Early replication intermediates were found in mature regions, while late intermediates were in the replicative intermediate region.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Cell Biology

    Background:

    • Polyoma minichromosomes are viral DNA-protein complexes.
    • Understanding DNA replication is crucial in molecular biology.

    Purpose of the Study:

    • To identify and quantify replicating DNA molecules in polyoma minichromosomes.
    • To investigate the distribution of replication intermediates within different regions of fractionated minichromosomes.

    Main Methods:

    • Sucrose gradient fractionation of 3H-labeled polyoma minichromosomes.
    • Electron microscopy for identification and quantification of DNA molecules.

    Main Results:

    • Replicating DNA molecules were enriched in the replicative intermediate region (up to ninefold higher).
    • Nearly equal numbers of replicating molecules were found in mature and intermediate regions due to concentration differences.
    • Early replication intermediates were predominantly in the mature region; late intermediates were in the replicative intermediate region.
    • Unusual, asymmetrical replicating structures suggest potential single-stranded regions.

    Conclusions:

    • Replication intermediates of polyoma minichromosomes exhibit distinct regional localization.
    • The presence of early intermediates in mature regions may indicate unique replication dynamics.
    • Unusual structures suggest complex DNA conformations during replication.

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