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Related Experiment Videos

Neutron scattering on nuclei.

P Baudy, S Bram

    Nucleic Acids Research
    |April 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Very small angle neutron scattering reveals structural features within intact nuclei. Nuclei exhibit scattering maxima around 18 nm and 30-40 nm, suggesting the presence of 35-50 nm fibers, not tightly supercoiled nucleofilaments.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Structural Biology

    Background:

    • Understanding the higher-order structure of chromatin within intact nuclei is crucial for comprehending nuclear function.
    • Previous models proposed various levels of chromatin organization, including tightly supercoiled nucleofilaments.

    Purpose of the Study:

    • To investigate the structural organization of chromatin within intact nuclei using neutron scattering.
    • To determine the presence or absence of specific structural motifs, such as supercoiled nucleofilaments, under physiological conditions.

    Main Methods:

    • Employed very small angle neutron scattering (VSANS) to probe the structure of intact nuclei.
    • Varied solution conditions to assess the stability and environmental dependence of observed structures.

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    Main Results:

    • Observed consistent scattering maxima at approximately 18 nm across different environments.
    • Identified a variable scattering maximum between 30-40 nm, consistent with the presence of 35-50 nm diameter fibers.
    • Crucially, no scattering maximum indicative of an 11 nm pitch supercoiled nucleofilament was detected.

    Conclusions:

    • The results support a model where chromatin is organized into larger fibers (35-50 nm) rather than tightly supercoiled 11 nm nucleofilaments within intact nuclei.
    • The 18 nm feature represents a stable structural element, while the larger fiber structure is more sensitive to the surrounding environment.