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The effects of methyl and bromo groups at C5 of C on the one-electron oxidation rate of G, and on the hole transfer rate in DNA have been investigated. The rates of one-electron oxidation of G and hole transfer from Py + to 8-oxo-7,8-dihydroguanine were suppressed and enhanced by introducing bromo and methyl groups, respectively, on the C at the complementary strand.
The hole transfer through DNA was monitored by the transient absorption of radical cation of phenothiazine (Ptz + ). The occurrence of hole transfer from G + generated in DNA to Ptz was observed in the time range of 100 μs. The hole transfer to Ptz was significantly suppressed by introducing oxG as a hole trap in DNA, and the trapping reaction of oxG + by water was suggested...
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