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Nucleosome structure.

P Oudet, J E Germond, M Bellard

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |May 11, 1978
    PubMed
    Summary
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    Two molecules of each histone protein are essential for forming nucleosomes, the basic units of DNA packaging. Histone proteins H3 and H4 can also form smaller particles, suggesting chromatin

    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Structural Biology

    Background:

    • DNA is packaged into chromatin, a complex of DNA and proteins called histones.
    • Understanding the structure of chromatin is crucial for comprehending gene regulation.

    Purpose of the Study:

    • To elucidate the molecular composition and structure of nucleosomes.
    • To investigate the DNA-compacting capabilities of specific histone proteins.

    Main Methods:

    • Electron microscopy for structural analysis.
    • Biochemical assays to determine molecular composition and DNA interactions.

    Main Results:

    • Nucleosomes are formed by two molecules each of histones H2A, H2B, H3, and H4, with approximately 200 base pairs of DNA.

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  • Histones H3 and H4 alone can compact DNA into sub-nucleosomal particles (8 nm) with induced negative superhelicity.
  • Chromatin exists dynamically, transitioning between compact nucleosomes and more open structures based on environmental factors.

    • Conclusions:

    • Defines the stoichiometry and dimensions of the nucleosome particle.
    • Identifies a minimal histone component (H3-H4) capable of significant DNA compaction and supercoiling.
    • Proposes a dynamic model for chromatin structure and its environmental responsiveness.