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• W2014298505 abstract "Oxidative guanine lesions were analyzed, at the nucleotide level, within DNA exposed to nanosecond ultraviolet (266 nm) laser pulses of variable intensity (0.002–0.1 J/cm2). Experiments were carried out, at room temperature, in TE buffer (20 mM Tris-HCl, pH 7.5; 1 mM EDTA) containing 35 mM NaCl, on 5′-end radioactively labeled double-stranded and single-stranded oligomer DNA at a size of 33–37 nucleobases. Lesions were analyzed on polyacrylamide gel electrophoresis by taking advantage of the specific removal of 8-oxodG from DNA by the formamidopyrimidine DNA glycosylase (Fpg protein) and of the differential sensitivity of 8-oxodG and oxazolone to piperidine. The quantum yields of lesions at individual sites, determined from the normalized intensities of bands, were plotted against the irradiation energy levels. Simplified model fitting of the experimental data enabled to evaluate the spectroscopic parameters characterizing excitation and photoionization processes. Results show that the distribution of guanine residues, excited to the lowest triplet state or photoionized, is heterogeneous and depends on the primary and secondary DNA structure. These findings are generalized in terms of excitation energy and charge-migration mediated biphotonic ionization. On the basis of the changes in the yield of the guanyl radical resulting from local helical perturbations in the DNA π-stack, it can be assessed that the distance range of migration is <6–8 bp." @default.
• W2014298505 created "2016-06-24" @default.
• W2014298505 creator A5001176567 @default.
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• W2014298505 date "2005-04-01" @default.
• W2014298505 modified "2023-10-16" @default.
• W2014298505 title "Origin of the Heterogeneous Distribution of the Yield of Guanyl Radical in UV Laser Photolyzed DNA" @default.
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• W2014298505 doi "https://doi.org/10.1529/biophysj.104.049015" @default.
• W2014298505 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1305372" @default.
• W2014298505 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15613625" @default.
• W2014298505 hasPublicationYear "2005" @default.
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