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Related Experiment Videos

X-ray scattering from randomly oriented superhelices. Circular superhelical DNA

C J Benham, G W Brady, D B Fein

    Biophysical Journal
    |March 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Scattering patterns from helical filaments were calculated. Results indicate superhelical DNA scattering matches coiled coil models, aiding structural analysis.

    Area of Science:

    • Biophysics
    • Structural Biology
    • Polymer Physics

    Background:

    • Understanding the structure of complex helical molecules like DNA is crucial.
    • Superhelical DNA exhibits intricate structures that influence its physical properties.
    • Scattering techniques are vital for probing molecular conformations.

    Purpose of the Study:

    • To calculate scattering functions for finite-length filaments with two orders of helicity.
    • To analyze the contribution of each helical order to the overall scattering pattern.
    • To compare calculated scattering with experimental data from superhelical DNA.

    Main Methods:

    • Theoretical calculation of scattering functions for helical filaments.
    • Approximation of scattering contributions from individual helical orders.

    Related Experiment Videos

  • Comparison of theoretical models with experimental scattering data.

    • Main Results:

    • Each order of helicity approximates scattering as a single helix.
    • The combined scattering is well-represented by the sum of individual helical contributions.
    • Measured scattering from superhelical DNA aligns with calculated patterns for a coiled coil geometry.

    Conclusions:

    • The scattering behavior of complex helices can be simplified by considering individual helical orders.
    • The coiled coil model provides a good approximation for the structure of dissolved superhelical DNA.
    • This study validates theoretical models against experimental observations in biophysical research.