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• W1978582593 endingPage "3551" @default.
• W1978582593 startingPage "3545" @default.
• W1978582593 abstract "The B3LYP/DZP++ level of theory has been employed to investigate the structures and energetics of the deprotonated adenine-uracil base pairs, (AU-H)-. Formation of the lowest-energy structure, [A(N9)-U]- (which corresponds to deprotonation at the N9 atom of adenine), through electron attachment to the corresponding neutral is accompanied by proton transfer from the uracil N3 atom to the adenine N1 atom. The driving force for this proton transfer is a significant stabilization from the base pairing in the proton transferred form. Such proton transfer upon electron attachment is also observed for the [A(N6b)-U]- and [A(C2)-U]- anions. Electron attachment to the A-U(N3) radical causes strong lone pair repulsion between the adenine N1 and the uracil N3 atoms, driving the two bases apart. Similarly, lone pair repulsion in the anion A(N6a)-U causes the loss of coplanarity of the two base units. The computed adiabatic electron attachment energies for nine AU-H radicals range from 1.86 to 3.75 eV, implying that the corresponding (AU-H)- anions are strongly bound. Because of the large AEAs of the (AU-H) radicals, the C-H and N-H bond dissociation in the AU- base pair anions requires less energy than the neutral AU base pair. The computed C-H and N-H bond dissociation energies for the AU- anion (i.e., the AU base pair plus one electron) are in the range 1.0-3.2 eV, while those for neutral AU are 4.08 eV or higher." @default.
• W1978582593 created "2016-06-24" @default.
• W1978582593 creator A5033633287 @default.
• W1978582593 creator A5047956413 @default.
• W1978582593 creator A5069821851 @default.
• W1978582593 date "2008-02-28" @default.
• W1978582593 modified "2023-09-27" @default.
• W1978582593 title "Structures and Energetics of the Deprotonated Adenine−Uracil Base Pair, Including Proton-Transferred Systems" @default.
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