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• W1986112182 abstract "A model for the kinetic folding pathway of the Tetrahymena ribozyme has been proposed where the two main structural domains, P4-P6 and P3-P7, form in a hierarchical manner with P4-P6 forming first and P3-P7 folding on the minute timescale. Recent studies in our laboratory identified a set of mutations that accelerate P3-P7 formation, and all of these mutations appear to destabilize a native-like kinetic trap. To better understand the microscopic details of this slow step in the Tetrahymena ribozyme folding pathway, we have used a previously developed kinetic oligonucleotide hybridization assay to characterize the folding of several fast folding mutants. A comparison of the temperature dependence of P3-P7 folding between the mutant and wild-type ribozymes demonstrates that a majority of the mutations act by decreasing the activation enthalpy required to reach the transition state and supports the existence of the native-like kinetic trap. In several mutant ribozymes, P3-P7 folds with biphasic kinetics, indicating that only a subpopulation of molecules can evade the kinetic barrier. The rate of folding of the wild-type increases in the presence of urea, while for the mutants urea merely shifts the distribution between the two folding populations. Small structural changes or changes in solvent can accelerate folding, but these changes lead to complex folding behavior, and do not give rise to rapid two-state folding transitions. These results support the recent view of folding as an ensemble of molecules traversing a rugged energy landscape to reach the lowest energy state." @default.
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• W1986112182 date "1998-08-01" @default.
• W1986112182 modified "2023-09-26" @default.
• W1986112182 title "Fast folding mutants of the Tetrahymena group I ribozyme reveal a rugged folding energy landscape 1 1Edited by D. Draper" @default.
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• W1986112182 doi "https://doi.org/10.1006/jmbi.1998.1960" @default.
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