283d

A CURVED RNA HELIX INCORPORATING AN INTERNAL LOOP WITH G-A AND A-A NON-WATSON-CRICK BASE PAIRING

spinqualitylabelsall models 283d, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 283d is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structure of the RNA dodecamer 5'-GGCC(GAAA)GGCC-3' has been determined from x-ray diffraction data to 2.3-A resolution. In the crystal, these oligomers form double helices around twofold symmetry axes. Four consecutive non-Watson-Crick base pairs make up an internal loop in the middle of the duplex, including sheared G.A pairs and novel asymmetric A.A pairs. This internal loop sequence produces a significant curvature and narrowing of the double helix. The helix is curved by 34 degrees from end to end and the diameter is narrowed by 24% in the internal loop. A Mn2+ ion is bound directly to the N7 of the first guanine in the Watson-Crick region following the internal loop and the phosphate of the preceding residue. This Mn2+ location corresponds to a metal binding site observed in the hammerhead catalytic RNA. A curved RNA helix incorporating an internal loop with G.A and A.A non-Watson-Crick base pairing.,Baeyens KJ, De Bondt HL, Pardi A, Holbrook SR Proc Natl Acad Sci U S A. 1996 Nov 12;93(23):12851-5. PMID:8917508 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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