Electron transfer in di(deoxy)nucleoside phosphates in aqueous solution: rapid migration of oxidative damage (via adenine) to guanine
作者:Luis Pedro Candeias、Steen Steenken
DOI:10.1021/ja00059a044
日期:1993.3
In aqueous solution, the one-electron loss centers created statistically by the oxidant SO4.- or by photoionization in di(2'-deoxy)nucleoside phosphates (DNPs) containing the base guanine (G) become localized at G, as concluded from pulse radiolysis and 193-nm laser photolysis experiments. From the latter it is evident that, in the case of adenylyl(3'-->5')guanosine (ApG), the charge-transfer process is complete in less-than-or-equal-to 50 ns. With DNPs containing a pyrimidine and the purine base adenine, the oxidative damage is collected by the adenine moiety (k greater-than-or-equal-to 2 X 10(5) s-1).