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Structure of the Eukaryotic Thiamine Pyrophosphate Riboswitch with Its Regulatory Ligand
Stéphane Thore,Marc Leibundgut,Nenad Ban*
Riboswitches are untranslated regions of messenger RNA, whichadopt alternate structures depending on the binding of specificmetabolites. Such conformational switching regulates the expressionof proteins involved in the biosynthesis of riboswitch substrates.Here, we present the 2.9 angstromresolution crystal structureof the eukaryotic Arabidopsis thaliana thiamine pyrophosphate(TPP)specific riboswitch in complex with its naturalligand. The riboswitch specifically recognizes the TPP via conservedresidues located within two highly distorted parallel "sensor"helices. The structure provides the basis for understandingthe reorganization of the riboswitch fold upon TPP binding andexplains the mechanism of resistance to the antibiotic pyrithiamine.
ETH Zurich, Institute of Molecular Biology and Biophysics, 8092 Zurich, Switzerland.
* To whom correspondence should be addressed. E-mail: ban{at}mol.biol.ethz.ch
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