1y26 | pdb_00001y26

A-riboswitch-adenine complex

spinqualitylabelsall models 1y26, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1y26 is a 1 chain structure. The October 2010 RCSB PDB Molecule of the Month feature on Riboswitches by David Goodsell is 10.2210/rcsb_pdb/mom_2010_10. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADE, MG Related: 1y27 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Metabolite-sensing mRNAs, or "riboswitches," specifically interact with small ligands and direct expression of the genes involved in their metabolism. Riboswitches contain sensing "aptamer" modules, capable of ligand-induced structural changes, and downstream regions, harboring expression-controlling elements. We report the crystal structures of the add A-riboswitch and xpt G-riboswitch aptamer modules that distinguish between bound adenine and guanine with exquisite specificity and modulate expression of two different sets of genes. The riboswitches form tuning fork-like architectures, in which the prongs are held in parallel through hairpin loop interactions, and the internal bubble zippers up to form the purine binding pocket. The bound purines are held by hydrogen bonding interactions involving conserved nucleotides along their entire periphery. Recognition specificity is associated with Watson-Crick pairing of the encapsulated adenine and guanine ligands with uridine and cytosine, respectively. Structural basis for discriminative regulation of gene expression by adenine- and guanine-sensing mRNAs.,Serganov A, Yuan YR, Pikovskaya O, Polonskaia A, Malinina L, Phan AT, Hobartner C, Micura R, Breaker RR, Patel DJ Chem Biol. 2004 Dec;11(12):1729-41. PMID:15610857 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Riboswitch Riboswitch 3D structures

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