1fc8

NMR SOLUTION STRUCTURE OF A CHIMERIC OLIGONUCLEOTIDE HAIRPIN R(GGAC)D(TTCG)2'F-A(GTCC)

spinqualitylabelsall models 1fc8 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1fc8 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 Ligands: CFL, GFL, TAF Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The first structure of a 2'-deoxy-2'-fluoro-D-arabinose nucleic acid (2'F-ANA)/RNA duplex is presented. We report the structural characterization by NMR spectroscopy of a small hybrid hairpin, r(GGAC)d(TTCG)2'F-a(GTCC), containing a 2'F-ANA/RNA stem and a four-residue DNA loop. Complete (1)H, (13)C, (19)F, and (31)P resonance assignments, scalar coupling constants, and NOE constraints were obtained from homonuclear and heteronuclear 2D spectra. In the chimeric duplex, the RNA strand adopts a classic A-form structure having C3' endo sugar puckers. The 2'F-ANA strand is neither A-form nor B-form and contains O4' endo sugar puckers. This contrasts strongly with the dynamic sugar conformations previously observed in the DNA strands of DNA/RNA hybrid duplexes. Structural parameters for the duplex, such as minor groove width, x-displacement, and inclination, were intermediate between those of A-form and B-form duplexes and similar to those of DNA/RNA duplexes. These results rationalize the enhanced stability of 2'F-ANA/RNA duplexes and their ability to elicit RNase H activity. The results are relevant for the design of new antisense drugs based on sugar-modified nucleic acids. NMR solution structure of an oligonucleotide hairpin with a 2'F-ANA/RNA stem: implications for RNase H specificity toward DNA/RNA hybrid duplexes.,Trempe JF, Wilds CJ, Denisov AY, Pon RT, Damha MJ, Gehring K J Am Chem Soc. 2001 May 30;123(21):4896-903. PMID:11457316 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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