1ow9

NMR Structure of the Active Conformation of the VS Ribozyme Cleavage Site

spinqualitylabelsall models 1ow9 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ow9 is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Substrate cleavage by the Neurospora Varkud satellite (VS) ribozyme involves a structural change in the stem-loop I substrate from an inactive to an active conformation. We have determined the NMR solution structure of a mutant stem-loop I that mimics the active conformation of the cleavage site internal loop. This structure shares many similarities, but also significant differences, with the previously determined structures of the inactive internal loop. The active internal loop displays different base-pairing interactions and forms a novel RNA fold composed exclusively of sheared G-A base pairs. From chemical-shift mapping we identified two Mg2+ binding sites in the active internal loop. One of the Mg2+ binding sites forms in the active but not the inactive conformation of the internal loop and is likely important for catalysis. Using the structure comparison program mc-search, we identified the active internal loop fold in other RNA structures. In Thermus thermophilus 16S rRNA, this RNA fold is directly involved in a long-range tertiary interaction. An analogous tertiary interaction may form between the active internal loop of the substrate and the catalytic domain of the VS ribozyme. The combination of NMR and bioinformatic approaches presented here has identified a novel RNA fold and provides insights into the structural basis of catalytic function in the Neurospora VS ribozyme. NMR structure of the active conformation of the Varkud satellite ribozyme cleavage site.,Hoffmann B, Mitchell GT, Gendron P, Major F, Andersen AA, Collins RA, Legault P Proc Natl Acad Sci U S A. 2003 Jun 10;100(12):7003-8. Epub 2003 Jun 2. PMID:12782785 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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