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Related Experiment Videos

Characterization of nuclear structures containing superhelical DNA.

P R Cook, I A Brazell, E Jost

    Journal of Cell Science
    |November 1, 1976
    PubMed
    Summary

    Researchers isolated protein-depleted cell structures called nucleoids. High salt concentrations during isolation removed most proteins, including histones, revealing intact, supercoiled, and circular DNA.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Cell lysis techniques can yield structures resembling nuclei.
    • These structures, termed nucleoids, can retain intact DNA.
    • Protein content of nucleoids is influenced by isolation conditions.

    Purpose of the Study:

    • To investigate the isolation of protein-depleted nucleoids.
    • To characterize the DNA within these nucleoids.
    • To determine the effect of salt concentration on nucleoid protein composition.

    Main Methods:

    • Gentle cell lysis using non-ionic detergents and high salt concentrations.
    • Sedimentation analysis in gradients with intercalating agents.
    • Isolation of human nucleoids in varying NaCl concentrations (1.0 M and 1.95 M).

    Main Results:

    • Nucleoids depleted of most proteins, including histones, were successfully isolated using 1.95 M NaCl.
    • Nucleoids isolated in 1.0 M NaCl contained variable amounts of histones.
    • Sedimentation properties indicated intact, supercoiled, and circular DNA within the nucleoids.
    • Nucleoid integrity was assessed under various experimental treatments.

    Conclusions:

    • High salt concentrations (1.95 M NaCl) effectively remove histones and most chromatin proteins during nucleoid isolation.
    • Nucleoid isolation protocols can yield protein-depleted structures preserving DNA integrity.
    • The findings provide insights into DNA organization and isolation methods for studying chromatin structure.

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