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- W4205310209 abstract "Abstract A plethora of modified nucleotides extends the chemical and conformational space for natural occurring RNAs. tRNAs constitute the class of RNAs with the highest modification rate. The extensive modification modulates their overall stability, the fidelity and efficiency of translation. However, the impact of nucleotide modifications on the local structural dynamics is not well characterized. Here we show that the incorporation of the modified nucleotides in tRNAfMet from Escherichia coli leads to an increase in the local conformational dynamics, ultimately resulting in the stabilization of the overall tertiary structure. Through analysis of the local dynamics by NMR spectroscopic methods we find that, although the overall thermal stability of the tRNA is higher for the modified molecule, the conformational fluctuations on the local level are increased in comparison to an unmodified tRNA. In consequence, the melting of individual base pairs in the unmodified tRNA is determined by high entropic penalties compared to the modified. Further, we find that the modifications lead to a stabilization of long-range interactions harmonizing the stability of the tRNA’s secondary and tertiary structure. Our results demonstrate that the increase in chemical space through introduction of modifications enables the population of otherwise inaccessible conformational substates." @default.
- W4205310209 created "2022-01-26" @default.
- W4205310209 creator A5001477363 @default.
- W4205310209 creator A5015067539 @default.
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- W4205310209 creator A5037994225 @default.
- W4205310209 creator A5056393437 @default.
- W4205310209 creator A5059726330 @default.
- W4205310209 date "2022-02-07" @default.
- W4205310209 modified "2023-10-18" @default.
- W4205310209 title "RNA modifications stabilize the tertiary structure of tRNAfMet by locally increasing conformational dynamics" @default.
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