Power-law solvation dynamics in DNA over six decades in time |
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Authors: | Andreatta Daniele Pérez Lustres J Louis Kovalenko Sergey A Ernsting Nikolaus P Murphy Catherine J Coleman Robert S Berg Mark A |
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Institution: | Department of Chemistry and Biochemistry, University of South Carolina, Columbia, 29208, USA. |
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Abstract: | Time-resolved Stokes shifts in a dye-containing oligonucleotide have been observed over the entire time range from 40 fs to 40 ns. The dynamics fit to a power law with a small exponent of 0.15. Similar relaxation has been seen in proteins but has not been anticipated in DNA. Distinct relaxation components due to specific subcomponents of the system, bulk water, bound water, counterions, backbone, bases, and so on, are not found. The various subcomponents may be so strongly coupled that their motions cannot be treated separately. |
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