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First-principles transversal DNA conductance deconstructed.

X-G Zhang1, Predrag S Krstić, Radomir Zikić

  • 1Center for Nanophase Materials Sciences, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. xgz@ornl.gov

Biophysical Journal
|May 9, 2006
PubMed
Summary
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Electron tunneling across DNA fragments is primarily governed by their physical size and distance to electrodes, not electronic properties. This suggests direct-current measurements may not be ideal for DNA sequencing.

Area of Science:

  • Condensed Matter Physics
  • Molecular Biophysics
  • Nanotechnology

Background:

  • Understanding electron transport through DNA is crucial for molecular electronics and biosensing.
  • Previous studies have explored DNA conductance, with varying conclusions on the dominant factors.

Purpose of the Study:

  • To investigate the fundamental mechanisms governing transverse conductance across DNA fragments.
  • To determine whether electronic structure or geometric factors dominate electron tunneling in DNA.

Main Methods:

  • Utilized first-principles calculations to simulate electron transport across DNA fragments (A, C, G, T) situated between gold nanoelectrodes.
  • Decomposed the calculated conductance into independent tunneling factors to analyze contributions from geometry and electronic structure.

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Main Results:

  • Transverse conductance is predominantly determined by geometric factors, specifically the size of the DNA base and its distance to the electrodes.
  • Larger DNA bases exhibit higher conductance due to shorter distances to the electrodes, independent of their specific electronic structures.
  • The four DNA bases (A, C, G, T) show conductance variations solely attributable to their differing physical dimensions.

Conclusions:

  • Electron tunneling through DNA is a geometric phenomenon, making direct-current measurements with gold electrodes unsuitable for DNA sequencing.
  • Experimental control over geometric factors is challenging, limiting the practical application of this method for sequence determination.
  • Future research may need to focus on alternative methods that are less sensitive to geometric variations or exploit them differently.