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Electron transfer in gamma-irradiated complexes between aromatic amino acids and DNA derivatives

par Olast, Martial ;Bertinchamps, Albert
Référence International journal of radiation biology, 24, 6, page (589-594)
Publication Publié, 1973

Article révisé par les pairs

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Résumé :

An e.s.r. study of γirradiated complexes of aromatic amino acids and DNA derivatives shows that the spins are not distributed among the constituents following their radiosensitivity, but localize preferentially on the DNA derivatives. It is suggested that a transfer of electrons occurs, via the stacking of the molecules, during the anionic stage of their radiolysis, from the aromatic amino acids towards the DNA derivatives, i.e., towards the moeity presenting the highest electron affinity. These findings substantiate further the mechanism proposed previously in order to explain the spin transfers observed from purine towards pyrimidine nucleotides in complexes of these constituents. © 1973 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.