1w86 | pdb_00001w86

Solution structure of an dsDNA:LNA triplex

spinqualitylabelsall models 1w86, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1w86 is a 3 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: LCC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed We have determined the NMR structure of an intramolecular dsDNA:LNA triplex, where the LNA strand is composed of alternating LNA and DNA nucleotides. The LNA oligonucleotide binds to the dsDNA duplex in the major groove by formation of Hoogsteen hydrogen bonds to the purine strand of the duplex. The structure of the dsDNA duplex is changed to accommodate the LNA strand, and it adopts a geometry intermediate between A- and B-type. There is a substantial propeller twist between base-paired nucleobases. This propeller twist and a concomitant large propeller twist between the purine and LNA strands allows the pyrimidines of the LNA strand to interact with the 5'-flanking duplex pyrimidines. Altogether, the triplex has a regular global geometry as shown by a straight helix axis. This shows that even though the third strand is composed of alternating DNA and LNA monomers with different sugar puckers, it forms a seamless triplex. The thermostability of the triplex is increased by 19 degrees C relative to the unmodified DNA triplex at acidic pH. Using NMR spectroscopy, we show that the dsDNA:LNA triplex is stable at pH 8, and that the triplex structure is identical to the structure determined at pH 5.1. Solution structure of a dsDNA:LNA triplex.,Sorensen JJ, Nielsen JT, Petersen M Nucleic Acids Res. 2004 Nov 18;32(20):6078-85. Print 2004. PMID:15550567 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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