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Related Experiment Videos

Intermediate in adenovirus type 2 replication.

G D Pearson

    Journal of Virology
    |July 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Replicating adenovirus DNA contains extensive parental single strands, suggesting a unique replication mechanism. Newly synthesized DNA strands show interruptions, requiring time for complete joining.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Biochemistry

    Background:

    • Adenovirus DNA replication is a complex process involving viral and host factors.
    • Understanding the structure of replicating viral DNA is crucial for deciphering replication mechanisms.

    Purpose of the Study:

    • To characterize the structure of intermediate replicating adenovirus DNA.
    • To investigate the role of parental DNA strands during replication.
    • To determine the kinetics of newly synthesized strand joining.

    Main Methods:

    • Extraction of intermediate DNA from adenovirus replication complexes.
    • Analysis using cesium chloride (CsCl) and ethidium bromide-CsCl density gradients.
    • Enzymatic digestion with S1 endonuclease and RNase.

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  • Sedimentation analysis in neutral sucrose gradients.
  • Alkaline denaturation to assess single-strand length.
  • Analysis of nascent DNA chain sizes.

    • Main Results:

    • Intermediate adenovirus DNA exhibited higher buoyant density than mature DNA.
    • S1 endonuclease digestion, but not RNase, eliminated density differences, indicating parental single-stranded regions.
    • Replicating DNA contained nascent chains of integral size classes, suggesting a link to viral nucleoprotein structure.
    • Newly synthesized DNA molecules had similar sedimentation and density to mature DNA but contained single-strand interruptions.
    • Complete joining of daughter strands took 15-20 minutes.

    Conclusions:

    • Replicating adenovirus DNA molecules contain significant regions of parental single strands.
    • The replication process involves the formation and eventual joining of nascent DNA strands with interruptions.
    • Nascent chain size classes may relate to the viral chromosome's nucleoprotein organization.