Direct measurement of hole transport dynamics in DNA

Frederick D. Lewis, Xiaoyang Liu, Jianqin Liu, Scott E. Miller, Ryan T. Hayes, Michael R Wasielewski

Research output: Contribution to journalArticle

301 Citations (Scopus)

Abstract

Our understanding of oxidative damage to double helical DNA and the design of DNA-based devices for molecular electronics is crucially dependent upon elucidation of the mechanism and dynamics of electron and hole transport in DNA. Electrons and holes can migrate from the locus of formation to trap sites, and such migration can occur through either a single-step 'super- exchange' mechanism or a multistep charge transport 'hopping' mechanism. The rates of single-step charge separation and charge recombination processes are found to decrease rapidly with increasing transfer distances, whereas multistep hole transport processes are only weakly distance dependent. However, the dynamics of hole transport has not yet been directly determined. Here we report spectroscopic measurements of photoinduced electron transfer in synthetic DNA that yield rate constants of ~5 x 107s-1 and 5 x 106s- 1, respectively, for the forward and return hole transport from a single guanine base to a double guanine base step across a single adenine. These rates are faster than processes leading to strand cleavage, such as the reaction of guanine cation radical with water, thus permitting holes to migrate over long distances in DNA. However, they are too slow to compete with charge recombination in contact ion pairs, a process which protects DNA from photochemical damage.

Original languageEnglish
Pages (from-to)51-53
Number of pages3
JournalNature
Volume406
Issue number6791
DOIs
Publication statusPublished - Jul 6 2000

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Guanine
DNA
Genetic Recombination
Electrons
Adenine
Electron Transport
DNA Damage
Cations
Ions
Equipment and Supplies
Water

ASJC Scopus subject areas

  • General

Cite this

Lewis, F. D., Liu, X., Liu, J., Miller, S. E., Hayes, R. T., & Wasielewski, M. R. (2000). Direct measurement of hole transport dynamics in DNA. Nature, 406(6791), 51-53. https://doi.org/10.1038/35017524

Direct measurement of hole transport dynamics in DNA. / Lewis, Frederick D.; Liu, Xiaoyang; Liu, Jianqin; Miller, Scott E.; Hayes, Ryan T.; Wasielewski, Michael R.

In: Nature, Vol. 406, No. 6791, 06.07.2000, p. 51-53.

Research output: Contribution to journalArticle

Lewis, FD, Liu, X, Liu, J, Miller, SE, Hayes, RT & Wasielewski, MR 2000, 'Direct measurement of hole transport dynamics in DNA', Nature, vol. 406, no. 6791, pp. 51-53. https://doi.org/10.1038/35017524
Lewis FD, Liu X, Liu J, Miller SE, Hayes RT, Wasielewski MR. Direct measurement of hole transport dynamics in DNA. Nature. 2000 Jul 6;406(6791):51-53. https://doi.org/10.1038/35017524
Lewis, Frederick D. ; Liu, Xiaoyang ; Liu, Jianqin ; Miller, Scott E. ; Hayes, Ryan T. ; Wasielewski, Michael R. / Direct measurement of hole transport dynamics in DNA. In: Nature. 2000 ; Vol. 406, No. 6791. pp. 51-53.
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