Femtosecond direct observation of charge transfer between bases in DNA

被引:351
作者
Wan, CZ [1 ]
Fiebig, T [1 ]
Schiemann, O [1 ]
Barton, JK [1 ]
Zewail, AH [1 ]
机构
[1] CALTECH, Arthur Amos Noyes Lab Chem Phys, Lab Mol Sci, Pasadena, CA 91125 USA
关键词
D O I
10.1073/pnas.250483297
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Charge transfer in supramolecular assemblies of DNA is unique because of the notion that the pi -stacked bases within the duplex may mediate the transport, possibly leading to damage and/or repair. The phenomenon of transport through pi -stacked arrays over a long distance has an analogy to conduction in molecular electronics, but the mechanism still needs to be determined. To decipher the elementary steps and the mechanism, one has to directly measure the dynamics in real time and in suitably designed, structurally well characterized DNA assemblies. Here, we report our first observation of the femtosecond dynamics of charge transport processes occurring between bases within duplex DNA. By monitoring the population of an initially excited 2-aminopurine, an isomer of adenine, we can follow the charge transfer process and measure its rate. We then study the effect of different bases next to the donor (acceptor), the base sequence, and the distance dependence between the donor and acceptor. We find that the charge injection to a nearest neighbor base is crucial and the time scale is vastly different: 10 ps for guanine and up to 512 ps for inosine. Depending on the base sequence the transfer can be slowed down or inhibited, and the distance dependence is dramatic over the range of 14 Angstrom. These observations provide the time scale, and the range and efficiency of the transfer. The results suggest the invalidity of an efficient wire-type behavior and indicate that long-range transport is a slow process of a different mechanism.
引用
收藏
页码:14052 / 14055
页数:4
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