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• W2019608675 abstract "We previously demonstrated--through the isolation of RNA-cleaving deoxyribozymes by in vitro selection that are catalytically active in highly acidic solutions--that DNA, despite its chemical simplicity, could perform catalysis under challenging chemical conditions [Liu,Z., Mei,S.H., Brennan,J.D. and Li,Y. (2003) J. Am. Chem. Soc. 125, 7539-7545]. One remarkable DNA molecule therefrom is pH4DZ1, a self-cleaving deoxyribozyme that exhibits a k(obs) of approximately 1 min(-1) at pH 3.8. In this study, we carried out a series of experiments to examine the sequence and catalytic properties of this acidic deoxyribozyme. Extensive nucleotide truncation experiments indicated that pH4DZ1 was a considerably large deoxyribozyme, requiring approximately 80 out of the original 123 nt for the optimal catalytic activity. A reselection experiment identified ten absolutely conserved nucleotides that are distributed in three catalytically crucial sequence elements. In addition, a trans deoxyribozyme was successfully designed. Comparison of the observed rate constant of pH4DZ1 with experimentally determined rate constant for the uncatalyzed reaction revealed that pH4DZ1 achieved a rate enhancement of approximately 10(6)-fold. This study provides valuable information about this low-pH-functional deoxyribozyme and paves way for further structural and mechanistic characterization of this unique catalytic DNA." @default.
• W2019608675 created "2016-06-24" @default.
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• W2019608675 creator A5081367802 @default.
• W2019608675 date "2005-12-09" @default.
• W2019608675 modified "2023-10-13" @default.
• W2019608675 title "Characterization of a catalytically efficient acidic RNA-cleaving deoxyribozyme" @default.
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• W2019608675 doi "https://doi.org/10.1093/nar/gki1013" @default.
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