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• W3003118381 abstract "G-Quadruplexes are formed by guanine rich DNA/RNA sequences in the presence of metal ions, which occupy the central cavity of these four-stranded structures. We show that these metal ions have a significant effect on the photogeneration and the reactivity of guanine radicals. Transient absorption experiments on G-quadruplexes formed by association of four TGGGGT strands in the presence of K+ reveal that the quantum yield of one-photon ionization at 266 nm (8.1 × 10–3) is twice as high as that determined in the presence of Na+. Replacement of Na+ with K+ also suppresses one reaction path involving deprotonated radicals, (G-H2)• → (G-H1)• tautomerization. Such behavior shows that the underlying mechanisms are governed by dynamical processes, controlled by the mobility of metal ions, which is higher for Na+ than for K+. These findings may contribute to our understanding of the ultraviolet-induced DNA damage and optimize optoelectronic devices based on four-stranded structures, beyond DNA." @default.
• W3003118381 created "2020-01-30" @default.
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• W3003118381 date "2020-01-22" @default.
• W3003118381 modified "2023-10-09" @default.
• W3003118381 title "Potassium Ions Enhance Guanine Radical Generation upon Absorption of Low-Energy Photons by G-Quadruplexes and Modify Their Reactivity" @default.
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• W3003118381 doi "https://doi.org/10.1021/acs.jpclett.9b03667" @default.
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