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• W2023741738 abstract "Monovalent cations play an important role in many biological functions. The guanine rich sequence, d(G4T4G4), requires monovalent cations for formation of the G-quadruplex, d(G4T4G4)2. This requirement can be satisfied by thallium (Tl+), a potassium (K+) surrogate. To verify that the structure of d(G4T4G4)2 in the presence of Tl+ is similar to the K+-form of the G-quadruplex, the solution structure of the Tl+-form of d(G4T4G4)2 was determined. The 10 lowest energy structures have an all atom RMSD of 0.76 ± 0.16 Å. Comparison of this structure to the identical G-quadruplex formed in the presence of K+ validates the isomorphous nature of Tl+ and K+. Using a 1H−205Tl spin−echo difference experiment we show that, in the Tl+-form of d(G4T4G4)2, small scalar couplings (<1 Hz) exist between 205Tl and protons in the G-quadruplex. These data comprise the first 1H−205Tl scalar couplings observed in a biological system and have the potential to provide important constraints for structure determination. These experiments can be applied to any system in which the substituted Tl+ cations are in slow exchange with the bulk ions in solution." @default.
• W2023741738 created "2016-06-24" @default.
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• W2023741738 creator A5039902482 @default.
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• W2023741738 date "2005-11-03" @default.
• W2023741738 modified "2023-09-23" @default.
• W2023741738 title "²⁰⁵Tl NMR Methods for the Characterization of Monovalent Cation Binding to Nucleic Acids" @default.
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• W2023741738 doi "https://doi.org/10.1021/ja055358f" @default.
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