4y1i | pdb_00004y1i

Lactococcus lactis yybP-ykoY Mn riboswitch bound to Mn2+

spinqualitylabelsall models 4y1i, resolution 2.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4y1i is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BA, GTP, MG, MN Related: 4y1j, 4y1m Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Gene regulation in cis by riboswitches is prevalent in bacteria. The yybP-ykoY riboswitch family is quite widespread, yet its ligand and function remained unknown. Here, we characterize the Lactococcus lactis yybP-ykoY orphan riboswitch as a Mn(2+)-dependent transcription-ON riboswitch, with a approximately 30-40 muM affinity for Mn(2+). We further determined its crystal structure at 2.7 A to elucidate the metal sensing mechanism. The riboswitch resembles a hairpin, with two coaxially stacked helices tethered by a four-way junction and a tertiary docking interface. The Mn(2+)-sensing region, strategically located at the highly conserved docking interface, has two metal binding sites. Whereas one site tolerates the binding of either Mg(2+) or Mn(2+), the other site strongly prefers Mn(2+) due to a direct contact from the N7 of an invariable adenosine. Mutagenesis and a Mn(2+)-free E. coli yybP-ykoY structure further reveal that Mn(2+) binding is coupled with stabilization of the Mn(2+)-sensing region and the aptamer domain. Mn(2+)-Sensing Mechanisms of yybP-ykoY Orphan Riboswitches.,Price IR, Gaballa A, Ding F, Helmann JD, Ke A Mol Cell. 2015 Mar 19;57(6):1110-23. doi: 10.1016/j.molcel.2015.02.016. PMID:25794619 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Riboswitch

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