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Related Experiment Videos

Isolation of a stimulatory factor for nuclear DNA replication.

E N Brewer

    Biochimica Et Biophysica Acta
    |August 29, 1979
    PubMed
    Summary

    A heat-stable factor from Physarum stimulates nuclear DNA replication in S-phase nuclei. This substance, present throughout the cell cycle, enhances DNA synthesis rate and extent.

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    Area of Science:

    • Molecular Biology
    • Cell Cycle Regulation
    • Biochemistry

    Background:

    • Nuclear DNA replication is a tightly regulated process crucial for cell division.
    • Understanding the factors that control DNA replication initiation and progression is fundamental to cell biology.
    • Physarum polycephalum, a} slime mold, offers a unique model for studying cell cycle dynamics.

    Purpose of the Study:

    • To identify and characterize heat-stable stimulators of nuclear DNA replication in Physarum.
    • To investigate the role of such factors in regulating DNA synthesis throughout the mitotic cycle.

    Main Methods:

    • Extraction of aqueous components from Physarum nuclei and plasmodia.
    • Partial purification of the stimulatory substance using heat treatment, ethanol precipitation, DEAE cellulose chromatography, and gel filtration.
    • Assay of DNA replication rates in isolated S-phase and G2-phase nuclei.

    Main Results:

    • A heat-stable stimulator of nuclear DNA replication was identified in Physarum.
    • The stimulatory factor is present throughout the mitotic cycle and is cycloheximide-insensitive.
    • Partially purified material (MW ~30,000, containing carbohydrate and protein) enhanced DNA replication rate and extent in S-phase nuclei but did not initiate synthesis in G2-phase nuclei.

    Conclusions:

    • Physarum contains a heat-stable, protein-carbohydrate complex that promotes DNA replication during the S-phase.
    • This factor appears to regulate the progression of DNA synthesis rather than initiation in G2-phase.
    • The findings contribute to understanding the molecular mechanisms governing DNA replication in eukaryotic cells.

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