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Related Experiment Videos

DNA as a programmable viscoelastic nanoelement.

Richard A Neher1, Ulrich Gerland

  • 1Arnold Sommerfeld Center for Theoretical Physics and Center for Nanoscience, Ludwig-Maximilians Universität München, Munich, Germany.

Biophysical Journal
|October 4, 2005
PubMed
Summary
This summary is machine-generated.

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DNA strands with repetitive sequences exhibit sliding dynamics mediated by defects, enabling transitions between basepairing patterns. This process, crucial for DNA, shows viscoelastic behavior under shear force and has implications for nanoscale devices.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Nanotechnology

Background:

  • DNA molecules with repetitive sequences can form various basepairing patterns.
  • Previous experiments suggested a sliding process for rapid transitions between relative strand positions in periodic DNA.

Purpose of the Study:

  • To theoretically investigate the basepairing dynamics of periodic and nearly periodic DNA.
  • To elucidate the mechanism of DNA sliding and its response to external forces.

Main Methods:

  • Detailed theoretical modeling of DNA basepairing dynamics.
  • Analysis of DNA response to shear forces, including sliding velocity and realignment.

Main Results:

  • DNA sliding is mediated by diffusing basepairing defects (bulge loops).

Related Experiment Videos

  • Shear force induces an average sliding velocity dependent on strand length and a threshold force.
  • Misaligned strands can realign even against opposing forces below the threshold.
  • Mutations in periodic sequences introduce a time delay in dynamic response without preventing sliding.

    • Conclusions:

    • DNA exhibits programmable viscoelastic behavior under shear forces.
    • The findings suggest novel dynamical roles for DNA in artificial nanoscale devices.
    • The basepairing dynamics are relevant for understanding repetitive sequence extension in genomic DNA.