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Related Experiment Videos

Diffusion and segmental dynamics of double-stranded DNA.

E P Petrov1, T Ohrt, R G Winkler

  • 1Institute of Biophysics/BIOTEC, Dresden University of Technology, Tatzberg 47-51, 01307 Dresden, Germany.

Physical Review Letters
|February 7, 2007
PubMed
Summary
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Double-stranded DNA exhibits semiflexible polymer behavior, with its segmental dynamics governed by hydrodynamic interactions across various lengths. This study quantifies DNA

Area of Science:

  • Polymer Physics
  • Biophysics
  • Molecular Biology

Background:

  • Understanding the physical properties of DNA is crucial for molecular biology and nanotechnology.
  • The transition of DNA from a stiff to a semiflexible chain behavior is not fully understood.

Purpose of the Study:

  • To quantitatively investigate the diffusion and segmental dynamics of double-stranded lambda-phage DNA.
  • To characterize DNA polymer behavior across the transition range from stiff to semiflexible chains.

Main Methods:

  • Utilized spectroscopy of fluorescence fluctuations.
  • Employed single-end fluorescently labeled monodisperse DNA fragments.

Main Results:

  • Demonstrated that double-stranded DNA (dsDNA) behaves as a semiflexible polymer.

Related Experiment Videos

  • Confirmed this behavior for DNA lengths ranging from 10^2 to 2 x 10^4 base pairs.
  • Showed that segmental dynamics are controlled by hydrodynamic interactions.

    • Conclusions:

    • Double-stranded DNA exhibits semiflexible polymer characteristics within the studied length range.
    • Hydrodynamic interactions play a key role in controlling the segmental dynamics of DNA.