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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Weir, Ron / Stohner, Jürgen

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1365-3075
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Volume 81, Issue 9 (Aug 2009)

Issues

Interaction of UV radiation with DNA helices

Dimitra Markovitsi
  • Corresponding author
  • Francis Perrin Laboratory, CEA-CNRS URA 2453, 91191 Gif-sur-Yvette, France
Published Online: 2009-08-19 | DOI: https://doi.org/10.1351/PAC-CON-08-09-23

Recent experimental and theoretical investigations dealing with model DNA double helices, composed of either adenine–thymine (A–T) or guanine–cytosine (G–C) base pairs, and G quadruplexes shed some light on the excited states populated by photon absorption and their relaxation, energy transfer among bases, and one-photon ionization. These studies revealed that the Franck–Condon excited states of DNA helices cannot be considered as the sum of their monomeric constituents because electronic coupling induces delocalization of the excitation over a few bases. Energy transfer takes place via intraband scattering in less than 100 fs. The fluorescence lifetimes of DNA helices detected by fluorescence upconversion and corresponding mainly to ππ* transitions are longer than that of an equimolar mixture of nucleotides; the only exception was observed for alternating G–C polymers. Moreover, nanosecond flash photolysis experiments showed that organization of bases within single and double helices may lead to a lowering of their ionization potential. Finally, the first determination regarding the time-scale needed for the formation of T dimers, the (6–4) adducts, was determined for the single strand (dT)20.

Keywords: DNA; energy transfer; excitons; fluorescence spectroscopy; photochemistry

Conference

IUPAC Symposium on Photochemistry, International Symposium on Photochemistry, PHOTO, Photochemistry, XXIInd, Gothenburg, Sweden, 2008-07-28–2008-08-01

References

About the article

Published Online: 2009-08-19

Published in Print: 2009-08-19


Citation Information: Pure and Applied Chemistry, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: https://doi.org/10.1351/PAC-CON-08-09-23.

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