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Related Experiment Videos

Elastic model of supercoiling.

C J Benham

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study presents an elastic model for DNA supercoiling, predicting two orders of helicity. Experimental data supports this model, showing distinct supercoiling regions in DNA molecules.

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    Area of Science:

    • Molecular Biology
    • Biophysics
    • Materials Science

    Background:

    • DNA exists as a double helix, a structure crucial for genetic information storage and replication.
    • Supercoiling, a higher-order structure of DNA, plays a significant role in various biological processes, including DNA replication and transcription.
    • Understanding the elastic properties of DNA is essential for comprehending its mechanical behavior and biological functions.

    Purpose of the Study:

    • To develop a theoretical elastic model for the supercoiling of duplex DNA.
    • To investigate the relationship between DNA's elastic properties and the resulting superhelicity under stress.
    • To provide a framework for interpreting experimental observations of DNA supercoiling.

    Main Methods:

    • Development of a continuum elastic model for double-helical DNA.

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  • Application of simplest assumptions regarding DNA's elastic properties: homogeneity, isotropy, circular cross-section, and straightness when unstressed.
  • Mathematical analysis to predict the orders of superhelicity generated when DNA is stressed.

    • Main Results:

    • The developed elastic model predicts that simple assumptions about DNA's elastic properties generate two orders of superhelicity when stressed.
    • The model's predictions align with recent experimental findings indicating distinct regions of two supercoiling orders in DNA molecules.
    • This suggests a fundamental mechanism governing DNA's response to mechanical stress.

    Conclusions:

    • The elastic model provides a theoretical basis for understanding the complex supercoiling behavior of DNA.
    • Experimental evidence supports the model's prediction of dual orders of superhelicity.
    • The findings contribute to a deeper understanding of DNA mechanics and its implications in biological systems.