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Sequence-dependent twist-stretch coupling in DNA.

Timothée Lionnet, Filip Lankas

    Biophysical Journal
    |December 5, 2006
    PubMed
    Summary
    This summary is machine-generated.

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    DNA

    Area of Science:

    • Biophysics
    • Molecular Biology
    • Computational Biology

    Background:

    • Single-molecule experiments show DNA elongates when overtwisted.
    • This phenomenon indicates a positive twist-stretch coupling in DNA.
    • Understanding this coupling is crucial for DNA mechanics.

    Purpose of the Study:

    • To develop a method for calculating sequence-specific twist-stretch coupling constants in DNA.
    • To investigate the relationship between DNA sequence and its mechanical properties.

    Main Methods:

    • Utilized a sequence-dependent dinucleotide force field.
    • Employed constrained minimization of DNA fragment deformation energy.
    • Inferred force field from atomistic molecular dynamics simulations.

    Related Experiment Videos

    Main Results:

    • Calculated twist-stretch coupling for random DNA sequences to be 0.30 nm/turn.
    • Determined coupling constants for all nine basepair oligomers (0.14–0.45 nm/turn).
    • Found a positive correlation between coupling strength and pyrimidine-purine steps.

    Conclusions:

    • The developed method accurately predicts DNA twist-stretch coupling.
    • DNA sequence significantly influences twist-stretch coupling.
    • Certain DNA sequences may be optimized for specific twist-stretch coupling properties.