Probing riboswitch–ligand interactions using thiamine pyrophosphate analogues

…, K Erixon, K Agyei-Owusu, J Micklefield…

Index: Chen, Liuhong; Cressina, Elena; Dixon, Neil; Erixon, Karl; Agyei-Owusu, Kwasi; Micklefield, Jason; Smith, Alison G.; Abell, Chris; Leeper, Finian J. Organic and Biomolecular Chemistry, 2012 , vol. 10, # 30 p. 5924 - 5931

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Citation Number: 8

Abstract

The Escherichia coli thiM riboswitch forms specific contacts with its natural ligand, thiamine pyrophosphate (TPP or thiamine diphosphate), allowing it to generate not only nanomolar binding affinity, but also a high degree of discrimination against similar small molecules. A range of synthetic TPP analogues have been used to probe each of the riboswitch–ligand interactions. The results show that the pyrimidine-sensing helix of thiM is exquisitely tuned ...