4qka

c-di-AMP riboswitch from Thermoanaerobacter pseudethanolicus, iridium hexamine soak

spinqualitylabelsall models 4qka, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4qka is a 1 chain structure with sequence from Thermoanaerobacter pseudethanolicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.2Å Ligands: 23G, 2BA, GTP, IRI, K, MG, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Bacterial second messenger cyclic di-AMP (c-di-AMP) is implicated in signaling DNA damage and cell wall stress through interactions with several protein receptors and a widespread ydaO-type riboswitch. We report the crystal structures of c-di-AMP riboswitches from Thermoanaerobacter pseudethanolicus and Thermovirga lienii determined at approximately 3.0-A resolution. In both species, the RNA adopts an unforeseen 'square'-shaped pseudosymmetrical architecture that features two three-way junctions, a turn and a pseudoknot, positioned in the square corners. Uncharacteristically for riboswitches, the structure is stapled by two ligand molecules that span the interior of the structure and employ similar noncanonical interactions for RNA recognition. Mutations in either ligand-binding site negatively affect c-di-AMP binding, suggesting that the riboswitch-triggered genetic response requires contribution of both ligands. Our data provide what are to our knowledge the first insights into specific sensing of c-di-AMP and a molecular mechanism underlying the common c-di-AMP-dependent control of essential cellular processes in bacteria. Structural insights into recognition of c-di-AMP by the ydaO riboswitch.,Gao A, Serganov A Nat Chem Biol. 2014 Sep;10(9):787-92. doi: 10.1038/nchembio.1607. Epub 2014 Aug, 3. PMID:25086507 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Riboswitch 3D structures

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