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Urea-induced structural changes in chromatin obtained by sedimentation.

R E Harrington

    Nucleic Acids Research
    |November 1, 1977
    PubMed
    Summary

    Researchers studied chicken erythrocyte chromatin fragments in urea to understand structural changes. Urea causes swelling in chromatin, with distinct effects on stripped chromatin (nu-bodies) versus whole chromatin (including inter-nu-body regions).

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Chromatin structure is crucial for DNA accessibility and gene regulation.
    • Understanding how chromatin components interact and respond to environmental factors like urea is essential.

    Purpose of the Study:

    • To investigate the structural effects of urea on fractionated chicken erythrocyte chromatin.
    • To differentiate the urea-induced structural changes in whole chromatin versus stripped chromatin.

    Main Methods:

    • Sedimentation coefficient analysis of fractionated chromatin preparations.
    • Fractionation involved creating whole and stripped chromatin (depleted of specific proteins).
    • Experiments were conducted in varying concentrations of urea (0-10 M).

    Main Results:

    • Significant differences in urea effects were observed between whole and stripped chromatin.
    • Analysis using Kirkwood's theory indicated urea-induced chain-swelling.
    • Stripped chromatin swelling was primarily attributed to effects on nu-bodies.

    Conclusions:

    • Urea's impact on chromatin structure is dependent on its protein composition.
    • Whole chromatin swelling involves both nu-bodies and the inter-nu-body regions.
    • These findings provide insights into the dynamic structural properties of chromatin.

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