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Assembly of active chromatin.

S Kumar, M Leffak

    Biochemistry
    |April 22, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Active chromatin replication differs from inactive chromatin. Histone deposition during active chromatin replication follows a semiconservative pathway, unlike conservative assembly in inactive nucleosomes.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Epigenetics

    Background:

    • Chromatin structure and function differ between active and inactive states in eukaryotic cells.
    • Understanding chromatin replication is crucial for cell division and inheritance.

    Purpose of the Study:

    • To investigate if active and inactive chromatin replication processes exhibit distinct mechanisms.
    • To determine the histone deposition pathway during active chromatin replication.

    Main Methods:

    • Selective isolation of active chromatin fraction (S1) using micrococcal nuclease digestion.
    • Analysis of S1 chromatin composition, including DNA, histones, and non-histone proteins.
    • Pulse-labeling of cells with dense amino acids followed by isolation and cross-linking of S1 chromatin.

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  • Isopycnic gradient centrifugation to analyze histone octamer density and assembly.

    • Main Results:

    • The S1 fraction, enriched in active chromatin, consists of mononucleosomes with approximately 160 base pairs of DNA.
    • Cross-linking of S1 chromatin revealed histone octamers with normal stoichiometry, lacking histone H1.
    • Pulse-labeled histone octamers in replicated S1 chromatin formed a single hybrid density band, indicating semiconservative assembly.

    Conclusions:

    • Histone deposition during active chromatin replication is a nonrandom, semiconservative process.
    • This contrasts with the conservative assembly observed in transcriptionally inactive nucleosomes.
    • Replication mechanisms contribute to maintaining distinct functional states of chromatin.