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Charge transport along the lambda-DNA double helix.

P Tran1, B Alavi, G Gruner

  • 1Department of Physics, University of California at Los Angeles, Los Angeles, California, USA.

Physical Review Letters
|September 6, 2000
PubMed
Summary
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We measured the electrical conductivity of lambda phage DNA (lambda-DNA) at microwave frequencies. Conductivity decreased significantly when the surrounding water layer was removed, indicating its importance for DNA

Area of Science:

  • Molecular Biophysics
  • Biophysics
  • DNA Nanotechnology

Background:

  • Understanding the electrical properties of DNA is crucial for developing novel electronic devices and understanding biological processes.
  • Lambda phage DNA (lambda-DNA) serves as a model system for studying the conductivity of long, double-helical nucleic acids.

Purpose of the Study:

  • To measure the conductivity of lambda-DNA at microwave frequencies.
  • To investigate the influence of temperature and hydration on DNA conductivity.

Main Methods:

  • Microwave frequency conductivity measurements were performed on lyophilized lambda-DNA.
  • Experiments were conducted both with and without a surrounding buffer solution to assess hydration effects.

Main Results:

Related Experiment Videos

  • Lambda-DNA exhibits a strong temperature-dependent conductivity around room temperature, transitioning to weak dependence at lower temperatures.
  • The removal of the water layer surrounding the DNA double helix resulted in a notable decrease in conductivity.

Conclusions:

  • Hydration plays a critical role in the electrical conductivity of lambda-DNA at microwave frequencies.
  • The findings suggest that water molecules are essential for efficient charge transport along the DNA molecule.