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- W790508628 abstract "UV-induced Dewar lesion formation is investigated in single- and double-stranded oligonucleotides with ultrafast vibrational spectroscopy. The quantum yield for the conversion of the (6-4) lesion to the Dewar isomer in DNA strands is reduced by a factor of 4 in comparison to model dinucleotides. Time resolved spectroscopy reveals a fast process in the excited state with spectral characteristics of bases which are adjacent to the excited (6-4) lesion. These kinetic components have large amplitudes and indicate that an additional quenching channel acts in the stranded DNA systems and reduces the Dewar formation yield. Presumably relaxation evolves via a charge transfer to the neighboring guanine and the paired cytosine participates in a double-stranded oligomer. Changes in the decay of the relaxed excited electronic state of the (6-4) chromophore point to modifications in the excited state energy landscape which may lead to an additional reduction of the Dewar formation yield." @default.
- W790508628 created "2016-06-24" @default.
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- W790508628 date "2015-07-02" @default.
- W790508628 modified "2023-09-30" @default.
- W790508628 title "Dewar Lesion Formation in Single- and Double-Stranded DNA is Quenched by Neighboring Bases" @default.
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- W790508628 doi "https://doi.org/10.1021/acs.jpcb.5b04694" @default.
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