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Related Experiment Videos

Phase-dependent polymerization and depolymerization of actin in Physarum polycephalum nuclei.

H Hashizume, T Kamiya, K Iwashita

    Cell Biology International Reports
    |September 1, 1984
    PubMed
    Summary

    Physarum polycephalum nuclear actin levels fluctuate during the cell cycle, with deoxyribonuclease I inhibition peaking in late S/early G2 phases. Total actin content, however, remains stable throughout the cell cycle.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Actin dynamics are crucial for eukaryotic cell function, including nuclear processes.
    • Understanding cell cycle-dependent protein regulation is key to deciphering cellular mechanisms.

    Purpose of the Study:

    • To quantify G- and F-actin levels within Physarum polycephalum nuclei during the cell cycle.
    • To investigate the cell cycle-specific regulation of nuclear actin.

    Main Methods:

    • Isolation of Physarum polycephalum nuclei at different cell cycle stages.
    • Quantification of G- and F-actin using deoxyribonuclease I (DNase I) inhibition assays.
    • Fractionation of actin proteins via DEAE-Toyopearl column chromatography.
    • Analysis of total nuclear actin content using SDS-polyacrylamide gel electrophoresis and DNase inhibition assays.

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    Main Results:

    • Deoxyribonuclease I inhibition, indicative of G- and F-actin, was maximal in late S or early G2 phases.
    • Actin inhibition reached minimal levels in late G2 or M phases.
    • Total nuclear actin content, analyzed by SDS-PAGE and DNase inhibition, did not exhibit significant cell cycle-dependent variations.

    Conclusions:

    • Nuclear actin content in Physarum polycephalum undergoes dynamic changes during the cell cycle, particularly in its G- and F-actin forms.
    • While total actin levels are stable, the ratio or accessibility of G- and F-actin appears to be regulated in a cell cycle-dependent manner.