Proton Transfer of Guanine Radical Cations Studied by Time-Resolved Resonance Raman Spectroscopy Combined with Pulse Radiolysis

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The oxidation of guanine (G) is studied by using transient absorption and time-resolved resonance Raman spectroscopies combined with pulse radiolysis. The transient absorption spectral change demonstrates that the neutral radical of G (G(center dot)( -H+)), generated by the deprotonation of G radical cation (G(center dot+)), is rapidly converted to other G radical species. The formation of this species shows the pH dependence, suggesting that it is the G radical cation (G(center dot+))' formed from the protonation at the N7 of G(center dot)( -H+). On one hand, most Raman bands of (G(center dot+))' are up-shifted relative to those of G, indicating the increase in the bonding order of pyrimidine (Pyr) and imidazole rings. The (G(center dot+))' exhibits the characteristic CO stretching mode at similar to 1266 cm(-1) corresponding to a C-O single bond, indicating that the unpaired electron in (G(center dot+))' is localized on the oxygen of the Pyr ring.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-12
Language
English
Article Type
Article
Keywords

B-FORM DNA; ELECTRON-TRANSFER; OXIDATIVE DAMAGE; AQUEOUS-SOLUTION; TRANSFORMATION REACTIONS; DFT CALCULATIONS; SUGAR RADICALS; G-QUADRUPLEX; NUCLEOTIDES; NUCLEOSIDES

Citation

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.6, no.24, pp.5045 - 5050

ISSN
1948-7185
DOI
10.1021/acs.jpclett.5b02313
URI
http://hdl.handle.net/10203/251164
Appears in Collection
CH-Journal Papers(저널논문)
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