Power-law solvation dynamics in DNA over six decades in time

被引:124
作者
Andreatta, D
Lustres, JLP
Kovalenko, SA
Ernsting, NP
Murphy, CJ
Coleman, RS
Berg, MA
机构
[1] Humboldt Univ, Inst Chem, D-12489 Berlin, Germany
[2] Ohio State Univ, Dept Chem, Columbus, OH 43210 USA
[3] Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA
关键词
D O I
10.1021/ja044177v
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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. Copyright © 2005 American Chemical Society.
引用
收藏
页码:7270 / 7271
页数:2
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