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- W2010290296 abstract "A density functional theory study has been performed in order to explore the influences of oxygen at the C8 position on the intramolecular proton transfer between the 6-oxo form and 6-hydroxy form of C8-oxidative adenine. The 8-oxo form with the oxygen at the C8 position has been found to be greatly energetically favored by the purines. The form of the N atom at C6 is decisive in adenine and in its C8 oxidative derivatives. In the isolated condition, the relative stability order for the C8-oxidative adenines follows 8-oxo-Aam > 8-hydroxy-Aam > 8-oxo-Aim > 8-hydroxy-Aim. Inclusion of the bulk electrostatic interaction or introducing a hydration water in the system changes the relative stabilities of the C8-oxidative adenines to 8-oxo-Aam > 8-oxo-Aim > 8-hydroxy-Aam > 8-hydroxy-Aim. The form of the oxygen at the C8 position determines the stability in the hydrated condition. The presence of the oxygen at the C8 position in adenine increases the tautomer rate from the imino to the amino form of adenine. Therefore, oxidation at the C8 position in adenine reduces the possibility of rare tautomers. However, polar solvents are expected to slow the tautomer rate. The tunneling effect might be the predominant factor in the tautomer process in the adenine derivatives at room temperature. Since the influence of the oxidation on the quantum corrected tautomerism rate constants has been found to be small, the oxygen at the C8 position of the oxidative adenines will not affect the tautomer rate significantly." @default.
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- W2010290296 date "2000-10-24" @default.
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- W2010290296 title "Intramolecular Proton Transfer in the Tautomers of C8 Oxidative Adenine: A DFT Study" @default.
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- W2010290296 doi "https://doi.org/10.1021/jp001576d" @default.
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