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Long-distance electron transfer through DNA.

Bernd Giese1

  • 1Department of Chemistry, University of Basel, St. Johanns Ring 19, CH-4056 Basel, Switzerland. bernd.giese@unibas.ch

Annual Review of Biochemistry
|June 5, 2002
PubMed
Summary

DNA facilitates long-distance electron transport via guanine (G) hopping. Its efficiency is influenced by DNA structure and G oxidation, but remains effective in certain DNA complexes, potentially mitigating oxidative stress damage.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Biochemistry

Background:

  • DNA molecules exhibit electron transport capabilities.
  • Electron transport is often initiated by guanine (G) oxidation, forming guanine radical cations.
  • This process is crucial for understanding DNA's role in oxidative stress.

Purpose of the Study:

  • To investigate the mechanism of long-distance electron transport in DNA.
  • To identify factors affecting DNA charge transport efficiency.
  • To explore the potential of DNA charge transport in mitigating oxidative damage.

Main Methods:

  • Studied electron transport through DNA using guanine oxidation as a trigger.
  • Analyzed the multistep hopping mechanism involving guanines as charge carriers.
  • Examined the impact of DNA structure (e.g., mismatches, single strands, triplexes, duplexes) and adenine (A) involvement on charge transport.

Main Results:

  • Electron transport occurs via a multistep hopping mechanism with guanines as primary carriers.
  • Hopping rates decrease significantly with increasing distance between guanines.
  • Adenines can act as charge carriers when (A:T) bridges are long.
  • Mismatches, single strands, and G-oxidation products reduce transport efficiency.
  • Charge transport remains relatively efficient in triplexes, DNA/RNA duplexes, and DNA/peptide complexes.

Conclusions:

  • DNA's long-distance electron transport is a G-hopping mechanism sensitive to distance and DNA structure.
  • Specific DNA architectures like triplexes and certain complexes maintain efficient charge transport.
  • This intrinsic DNA property may offer a protective mechanism against oxidative stress-induced DNA damage.

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