Power-law solvation dynamics in DNA over six decades in time
Power-law solvation dynamics in DNA over six decades in time
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DOI：
10.1021/ja044177v
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发表时间：
2005-05-25
影响因子：
15
通讯作者：
Berg, MA
中科院分区：
文献类型：
--
作者：
Andreatta, D;Lustres, JLP;Berg, MA
在40 ns到40 ns的整个时间范围内，观察到了含染料寡核苷酸的时间分辨斯托克斯位移。动力学符合指数为0.15的幂函数。在蛋白质中也看到了类似的松弛，但在DNA中还没有预料到。由于体系的特定亚组分、散体水、结合水、反离子、主干、碱等原因，没有发现明显的松弛组分。不同的子组件可能是如此强烈地耦合，以至于它们的运动不能分开处理。
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.