Structure of the SAM-II riboswitch bound to S-adenosylmethionine.

Nature Structural & Molecular Biology
Sunny D GilbertRobert T Batey

Abstract

In bacteria, numerous genes harbor regulatory elements in the 5' untranslated regions of their mRNA, termed riboswitches, which control gene expression by binding small-molecule metabolites. These sequences influence the secondary and tertiary structure of the RNA in a ligand-dependent manner, thereby directing its transcription or translation. The crystal structure of an S-adenosylmethionine-responsive riboswitch found predominantly in proteobacteria, SAM-II, has been solved to reveal a second means by which RNA interacts with this important cellular metabolite. Notably, this is the first structure of a complete riboswitch containing all sequences associated with both the ligand binding aptamer domain and the regulatory expression platform. Chemical probing of this RNA in the absence and presence of ligand shows how the structure changes in response to S-adenosylmethionine to sequester the ribosomal binding site and affect translational gene regulation.

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