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Electron Transfer in Gamma-irradiated Complexes between DNA Nucleotides and Proflavine

1970; Taylor & Francis; Volume: 18; Issue: 6 Linguagem: Inglês

10.1080/09553007014551511

0020-7616

Silvano Gregoli, Carla Taverna, Albert Bertinchamps,

Photochemistry and Electron Transfer Studies

SummaryStacking complexes between DNA or DNA nucleotides and proflavine were studied by E.S.R. spectroscopy after γ-irradiation. The final radiation damage was found to be completely localized on the dye even when the nucleotide: proflavine molar ratio greatly exceeded the equimolar ratio. According to a model which we suggested previously, these results are explained by the random formation of anionic radicals followed by a long-range electron transfer via the stacking towards the constituents of greatest electron affinity.