Thermodynamic and Kinetic Folding of Riboswitches

Thermodynamic and Kinetic Folding of Riboswitches

Abstract

Riboswitches are structured RNA regulatory elements located in the 5'-UTRs of mRNAs. Ligand-binding induces a structural rearrangement in these RNA elements, effecting events in downstream located coding sequences. Since they do not require proteins for their functions, they are ideally suited for computational analysis using the toolbox of RNA structure prediction methods. By their very definition riboswitch function depends on structural change. Methods that consider only the thermodynamic equilibrium of an RNA are therefore of limited use. Instead, one needs to employ computationally more expensive methods that consider the energy landscape and the folding dynamics on that landscape. Moreover, for the important class of kinetic riboswitches, the mechanism of riboswitch function can only be understood in the context of co-transcriptional folding. We present a computational approach to simulate the dynamic behavior of riboswitches during co-transcriptional folding in the presence and absence of a ligand. Our investigations show that the abstraction level of RNA secondary structure in combination with a dynamic folding landscape approach is expressive enough to understand how riboswitches perform their function. We apply our approach to a experimentally validated theophylline-binding riboswitch.

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Authors
  • Badelt, Stefan
  • Hammer, Stefan
  • Flamm, Christoph
  • Hofacker, Ivo L.
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Projects
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Shortfacts
Category
Book Section/Chapter
Divisions
Bioinformatics and Computational Biology
Title of Book
Methods in Enzymology
Page Range
pp. 193-213
Date
February 2015
Official URL
http://www.sciencedirect.com/science/article/pii/S...
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