3i2u | pdb_00003i2u

Crystal structure of the haiprin ribozyme with a 2',5'-linked substrate and N1-deazaadenosine at position A10

spinqualitylabelsall models 3i2u, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3i2u is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NCO, SO4 NonStd Res: 1DP, S9L Related: 3i2p, 3i2q, 3i2r, 3i2s Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The hairpin ribozyme cleaves a phosphodiester bond within a cognate substrate. Structural and biochemical data indicate the conserved A9 and A10 bases reside close to the scissile bond but make distinct contributions to catalysis. To investigate these residues, we replaced the imino moiety of each base with N1-deazaadenosine. This single-atom change resulted in an 8-fold loss in k(obs) for A9 and displacement of the base from the active site; no effects were observed for A10. We propose that the imino moiety of A9 promotes a key water-mediated contact that favors transition-state formation, which suggests an enhanced chemical repertoire for RNA. Single-atom imino substitutions at A9 and A10 reveal distinct effects on the fold and function of the hairpin ribozyme catalytic core.,Spitale RC, Volpini R, Mungillo MV, Krucinska J, Cristalli G, Wedekind JE Biochemistry. 2009 Aug 25;48(33):7777-9. PMID:19634899 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribozyme 3D structures

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