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Related Experiment Videos

Phosphorus distribution in the nucleosome

D P Bazett-Jones, F P Ottensmeyer

    Science (New York, N.Y.)
    |January 9, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Researchers mapped phosphorus in nucleosomes, revealing DNA

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Microscopy

    Background:

    • Nucleosomes are the fundamental units of DNA packaging in eukaryotes.
    • Understanding DNA's spatial arrangement within nucleosomes is crucial for gene regulation.
    • Elemental microanalysis techniques are essential for studying molecular structures.

    Purpose of the Study:

    • To determine the spatial distribution of phosphorus within active fraction nucleosomes.
    • To elucidate the path of DNA supercoiled around the histone core.
    • To establish new sensitivity limits for elemental microanalysis.

    Main Methods:

    • Utilized an imaging electron spectrometer.
    • Employed a conventional transmission electron microscope.
    • Analyzed phosphorus distribution in nucleosomes.

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    Main Results:

    • Phosphorus distribution indicates DNA follows approximately 1.75 turns around the protein core.
    • The DNA path is consistent with supercoiling around the histone octamer.
    • Achieved unprecedented sensitivity in elemental microanalysis.

    Conclusions:

    • The study provides a detailed map of DNA within nucleosomes.
    • This technique advances the understanding of DNA packaging and elemental analysis sensitivity.