DNA electron transfer mechanism and dynamics
نویسندگان
چکیده
منابع مشابه
Femtosecond dynamics of DNA-mediated electron transfer.
Diverse biophysical and biochemical studies have sought to understand electron transfer (ET) in DNA in part because of its importance to DNA damage and its repair. However, the dynamics and mechanisms of the elementary processes of ET in this medium are not fully understood and have been heavily debated. Two fundamental issues are the distance over which charge is transported and the time-scale...
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Photolyase is an enzyme that uses light energy to repair UV-induced DNA damage. We report here our femtosecond studies of the complex dynamics of energy and electron transfer in E. coli photolyase. Under physiological conditions, the excitation energy transfer from the antenna molecule methenyltetrahydrofolate (MTHF) to the fully reduced cofactor flavin (FADH-) occurs in 292 ps, but it takes 19...
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Electron transfer between redox proteins participating in energy chains of biology is required to proceed with high energetic efficiency, minimizing losses of redox energy to heat. Within the standard models of electron transfer, this requirement, combined with the need for unidirectional (preferably activationless) transitions, is translated into the need to minimize the reorganization energy ...
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The quenching of excited singlet methylene blue (IMB + * ) by N,N-dimethylaminomethylferrocene (FcN) in acetonitrile at room temperature has been studied using femtosecond pump-probe absorption spectroscopy. At high FcN concentration static quenching via an intermolecular electron transfer mechanism constitutes the predominating decay channel for l MB + * The time constants of the large amplitu...
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Based on the accurate identification of chemical structures as electric elements, we described charge transport mechanism in a DNA molecule by a stepwise LC oscillatory circuitry, in which every base pair is a capacitor, every phosphate bridge is an inductor, and every deoxyribose is a charge router. The circuit model agrees with established experimental evidence that has supported super-exchan...
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ژورنال
عنوان ژورنال: Nucleic Acids Symposium Series
سال: 2008
ISSN: 0261-3166,1746-8272
DOI: 10.1093/nass/nrn049