'-D eoxyguanosine Oxidation at C 8 Position on N-G lycosidic Bond Stability
نویسندگان
چکیده
The influence of 2'-deoxyguanosine (dG) oxidation at the C-8 position on N-glycosidic bond stability was in vestigated. A kinetic analysis of dG and 8-oxo-2'-deoxyguanosine (8-oxodG) depurination reactions was carried out in water solutions at pH ranging from 2 to 7.4 and temperature of 100 °C. The results indicate that N-glyco sidic bond of 8-oxodG is significantly more stable in comparison with dG at any pH applied. At pH 5.1 hy drolysis rate of dG is 4.5-fold higher than that for 8oxodG. The chemical stability of the modified nucleo side in oxidatively damaged DNA is one of important factors contributing to its mutagenic potential. Results of our experiments indicate that 8-oxodG, potentially mutagenic and carcinogenic nucleoside, is hardly suscep tible to spontaneous depurination and its removal from cellular DNA depends mostly on the activity of DNA repair enzymes.
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