2iro | pdb_00002iro

The NMR Structures of (rGCUGAGGCU)2 and (rGCGGAUGCU)2

spinqualitylabelsall models 2iro, 15 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2iro is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 2irn Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The NMR structures of [see text] and [see text] are reported. The internal loop, [see text], is about 2 kcal/mol more stable than [see text] at 37 degrees C. The duplexes assemble into similar global folds characterized by the formation of tandem sheared GA pairs. The different stabilities of the loops are accompanied by differences in the local structure of the closing GU pairs. In the [see text] internal loop, the GU pairs form canonical wobble configurations with two hydrogen bonds, whereas in [see text], the GU pairs form a single hydrogen bond involving the amino group, GH22, and the carbonyl group, UO4. This pairing is similar to the GU closing pair of the 690 hairpin loop found in E. coli 16S rRNA. The [see text] and [see text] structures reveal how the subtle interplay between stacking and hydrogen bonding determines sequence dependent conformation and thermodynamic stability. Thus, this work provides structural and thermodynamic benchmarks for theoreticians in the ongoing effort to understand the sequence dependence of RNA physicochemical properties. NMR structures of (rGCUGAGGCU)2 and (rGCGGAUGCU)2: probing the structural features that shape the thermodynamic stability of GA pairs.,Tolbert BS, Kennedy SD, Schroeder SJ, Krugh TR, Turner DH Biochemistry. 2007 Feb 13;46(6):1511-22. Epub 2007 Jan 20. PMID:17279616 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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