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• W2061244509 abstract "We have used two-dimensional 1H NMR spectroscopy at 750 MHz to determine a high-resolution solution structure of an oligonucleotide containing restricted nucleotides with a 2‘-O, 4‘-C-methylene bridge (LNA) hybridized to the complementary DNA strand. The LNA:DNA duplex examined contained four thymidine LNA modifications (TL), d(C1TL2G3C4TL5TL6C7TL8G9C10):d(G11C12A13G14A15A16G17C18A19G20). A total relaxation matrix approach was used to obtain interproton distance bounds from NOESY cross-peak intensities. These distance bounds were used as restraints in molecular dynamics (rMD) calculations. Forty final structures were generated for the duplex from A-form and B-form DNA starting structures. The root-mean-square deviation (RMSD) of the coordinates for the 40 structures of the complex was 0.6 Å. The sugar puckerings are averaged values of a dynamic interchange between N- and S-type conformation except in case of the locked nucleotides that were found to be fixed in the C3‘-endo conformation. Among the other nucleotides in the modified strand, the furanose ring of C7 and G9 is predominatly in the N-type conformation whereas that of G3 is in a mixed conformation. The furanose rings of the nucleotides in the unmodified complementary strand are almost exclusively in the S-type conformation. Due to these different conformations of the sugars in the two strands, there is a structural strain between the A-type modified strand and the B-type unmodified complementary strand. This strain is relaxed by decreasing the value of rise and compensating with tip, buckle, and propeller twist. The values of twist vary along the strand but for a majority of the base pairs a value even lower than that of A-DNA is observed. The average twist over the sequence is 32 ± 1°. On the basis of the structure, we conclude that the high stability of LNA:DNA duplexes is caused by a local change of the phosphate backbone geometry that favors a higher degree of stacking." @default.
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• W2061244509 date "2000-02-23" @default.
• W2061244509 modified "2023-09-23" @default.
• W2061244509 title "Solution Structure of an LNA Hybridized to DNA: NMR Study of the d(CT^LGCT^LT^LCT^LGC):d(GCAGAAGCAG) Duplex Containing Four Locked Nucleotides" @default.
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• W2061244509 doi "https://doi.org/10.1021/bc990121s" @default.
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