Synthetic ligands for PreQ
| Autor: | Colleen M, Connelly, Tomoyuki, Numata, Robert E, Boer, Michelle H, Moon, Ranu S, Sinniah, Joseph J, Barchi, Adrian R, Ferré-D'Amaré, John S, Schneekloth |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Riboswitches are naturally occurring RNA aptamers that regulate gene expression by binding to specific small molecules. Riboswitches control the expression of essential bacterial genes and are important models for RNA-small molecule recognition. Here, we report the discovery of a class of synthetic small molecules that bind to PreQ1 riboswitch aptamers. These molecules bind specifically and reversibly to the aptamers with high affinity and induce a conformational change. Furthermore, the ligands modulate riboswitch activity through transcriptional termination despite no obvious chemical similarity to the cognate ligand. X-ray crystallographic studies reveal that the ligands share a binding site with the cognate ligand but make different contacts. Finally, alteration of the chemical structure of the ligand causes changes in the mode of RNA binding and affects regulatory function. Thus, target- and structure-based approaches can be used to identify and understand the mechanism of synthetic ligands that bind to and regulate complex, folded RNAs. RNA sensors—Riboswitches—respond to the binding of small molecules ligands through structure modification. Here the authors identify synthetic small molecules that bind and regulate the activity of PreQ1 Riboswitches despite having no obvious chemical similarity to the cognate ligand. |
| Databáze: | OpenAIRE |
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