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- W2016126410 abstract "The selection of modified DNAzymes represents an important endeavor in expanding the chemical and catalytic properties of catalytic nucleic acids. Few examples of such exist and to date, there is no example where three different modified bases have been simultaneously incorporated for catalytic activity. Herein, dCTP, dATP and dUTP bearing, respectively, a cationic amine, an imidazole and a cationic guanidine, were enzymatically polymerized on a DNA template for the selection of a highly functionalized DNAzyme, called DNAzyme 9-86, that catalyzed (M 2+ )-independent self-cleavage under physiological conditions at a single ribo(cytosine)phosphodiester linkage with a rate constant of (0.134 ± 0.026) min −1 . A pH rate profile analysis revealed p Ka 's of 7.4 and 8.1, consistent with both general acid and base catalysis. The presence of guanidinium cations permits cleavage at significantly higher temperatures than previously observed for DNAzymes with only amines and imidazoles. Qualitatively, DNAzyme 9-86 presents an unprecedented ensemble of synthetic functionalities while quantitatively it expresses one of the highest reported values for any self-cleaving nucleic acid when investigated under M 2+ -free conditions at 37°C." @default.
- W2016126410 created "2016-06-24" @default.
- W2016126410 creator A5004769994 @default.
- W2016126410 creator A5026963090 @default.
- W2016126410 creator A5062001730 @default.
- W2016126410 creator A5069127423 @default.
- W2016126410 date "2009-01-19" @default.
- W2016126410 modified "2023-10-11" @default.
- W2016126410 title "A self-cleaving DNA enzyme modified with amines, guanidines and imidazoles operates independently of divalent metal cations (M 2+ )" @default.
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- W2016126410 doi "https://doi.org/10.1093/nar/gkn1070" @default.