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Related Experiment Videos

Supranucleosomal structure of chromatin.

W H Strätling, U Müller, H Zentgraf

    Cell Biology International Reports
    |September 1, 1978
    PubMed
    Summary

    Researchers studied rat liver chromatin structure using micrococcal nuclease digestion. They identified distinct monomer and dimer particles, suggesting a higher-order supranucleosomal structure composed of densely packed nucleosomes.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Chromatin, the complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells, plays a crucial role in genome organization and regulation.
    • Understanding the higher-order structure of chromatin is essential for elucidating gene expression and DNA replication mechanisms.

    Purpose of the Study:

    • To investigate the supranucleosomal organization of rat liver chromatin.
    • To characterize the structural units of chromatin higher-order folding.

    Main Methods:

    • Chromatin isolation from rat liver.
    • Moderate digestion with micrococcal nuclease.
    • Analysis using isokinetic sucrose gradient centrifugation and electron microscopy.

    Main Results:

    • Two distinct particle classes sedimenting at approximately 33S (monomers) and 60S (dimers) were identified.
    • Kinetics of particle appearance/disappearance indicated derivation from a supranucleosomal structure.
    • Monomers and dimers were biochemically and morphologically characterized as containing eight and sixteen nucleosomes, respectively.
    • These nucleosome assemblies were observed as densely packed globules of 23 nm (monomers) and 29 nm (dimers).

    Conclusions:

    • Rat liver chromatin exists in a higher-order supranucleosomal structure.
    • This structure yields distinct monomeric and dimeric units upon nuclease digestion.
    • These units represent densely packed nucleosome globules, providing insights into chromatin higher-order organization.

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