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• W2018697310 startingPage "4197" @default.
• W2018697310 abstract "Manganese (Mn(2+)) promotes specific cleavage at two major (I and III) and four minor (II, IV, V and VI) sites, in addition to slow non-specific cleavage, in a 659-nucleotide RNA containing the Cr.LSU group I intron. The specific cleavages occurred between G and AAA sequences and thus can be considered Mn(2+)-GAAA ribozymes. We have estimated rates of specific and non-specific cleavages under different conditions. Comparisons of the rates of major-specific and background cleavages gave a maximal specificity of approximately 900 for GAAA cleavage. Both specific and non-specific cleavages showed hyperbolic kinetics and there was no evidence of cooperativity with Mn(2+) concentration. Interestingly, at site III, Mg(2+) alone promoted weak, but the same specific cleavage as Mn(2+). When added with Mn(2+), Mg(2+) had a synergistic effect on cleavage at site III, but inhibited cleavage at the other sites. Mn(2+) cleavage at site III also exhibited lower values of K (Mn(2+) requirement), pH-dependency and activation energy than did cleavage at the other sites. In contrast, the pH-dependency and activation energy for cleavage at site I was similar to non-specific cleavage. These results increase our understanding of the Mn(2+)-GAAA ribozyme. The implications for evolution of small ribozymes are also discussed." @default.
• W2018697310 created "2016-06-24" @default.
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• W2018697310 date "2000-11-01" @default.
• W2018697310 modified "2023-10-03" @default.
• W2018697310 title "Quantitative studies of Mn2+-promoted specific and non-specific cleavages of a large RNA: Mn2+-GAAA ribozymes and the evolution of small ribozymes" @default.
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• W2018697310 doi "https://doi.org/10.1093/nar/28.21.4197" @default.
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