2qwy | pdb_00002qwy

SAM-II riboswitch bound to S-adenosylmethionine

spinqualitylabelsall models 2qwy, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2qwy is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CS, MG, PO4, SAM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Publication Abstract from PubMed 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. Structure of the SAM-II riboswitch bound to S-adenosylmethionine.,Gilbert SD, Rambo RP, Van Tyne D, Batey RT Nat Struct Mol Biol. 2008 Feb;15(2):177-82. Epub 2008 Jan 20. PMID:18204466 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Riboswitch

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