2rn1

Liquid crystal solution structure of the kissing complex formed by the apical loop of the HIV TAR RNA and a high affinity RNA aptamer optimized by SELEX

spinqualitylabelsall models 2rn1, 17 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2rn1 is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1kis Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Transactivation-response element (TAR) is a stable stem-loop structure of HIV RNA, which plays a crucial role during the life cycle of the virus. The apical loop of TAR acts as a binding site for essential cellular cofactors required for the replication of HIV. High-affinity aptamers directed against the apical loop of TAR have been identified by the SELEX approach. The RNA aptamers with the highest affinity for TAR fold as hairpins and form kissing complexes with the targeted RNA through loop-loop interactions. The aptamers with the strongest binding properties all possess a GA base pair combination at the loop-closing position. Using liquid-crystal NMR methodology, we have obtained a structural model in solution of a TAR-aptamer kissing complex with an unprecedented accuracy. This high-resolution structure reveals that the GA base pair is unilaterally shifted toward the 5' strand and is stabilized by a network of intersugar hydrogen bonds. This specific conformation of the GA base pair allows for the formation of two supplementary stable base-pair interactions. By systematic permutations of the loop-closing base pair, we establish that the identified atomic interactions, which form the basis for the high stability of the complex, are maintained in several other kissing complexes. This study rationalizes the stabilizing role of the loop-closing GA base pairs in kissing complexes and may help the development or improvement of drugs against RNA loops of viruses or pathogens as well as the conception of biochemical tools targeting RNA hairpins involved in important biological functions. Liquid-crystal NMR structure of HIV TAR RNA bound to its SELEX RNA aptamer reveals the origins of the high stability of the complex.,Van Melckebeke H, Devany M, Di Primo C, Beaurain F, Toulme JJ, Bryce DL, Boisbouvier J Proc Natl Acad Sci U S A. 2008 Jul 8;105(27):9210-5. Epub 2008 Jul 7. PMID:18607001 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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