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- W2086437326 abstract "Intramolecular triple helices have been obtained by twice folding back oligonucleotides formed by decamers bound by nonnucleotide linkers: 5‘d(G)10−L−d(C)10−L−d(G)10−3‘ and 5‘d(C)10−L−d(G)10−L−d(G)10−3‘ (L = pO(CH2CH2O)6p). We have thus prepared two triple helices with forced third strand orientation, respectively parallel and antiparallel with respect to the guanosine strand of the Watson−Crick duplex. The stability of the parallel triplex is found to be lower than that of the antiparallel, and the sugar conformations determined by infrared spectroscopy are different for both triplexes. Only S-type sugars are found in the antiparallel triplex, whereas both S- and N-type sugars are present in the parallel one. In-plane normal-mode frequencies have been calculated for G*G·C triplet by using a valence force field that incorporates transition dipole coupling for guanine CO groups in the Hoogsteen triplet structure. This coupling mechanism is shown to give a reasonable explanation of the νCO splitting observed for the Hoogsteen G*G·C triplet, unlike the νCO spectral profile of the reverse Hoogsteen structure, where this coupling is absent. It is, therefore, now possible to distinguish with confidence between these triplet structures, and their characteristic spectral features can be applied to get structural information of nucleic acid triplexes." @default.
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- W2086437326 date "2000-07-14" @default.
- W2086437326 modified "2023-09-25" @default.
- W2086437326 title "Spectroscopic Characterization of the G*G·C Triplet in Triple Helix Structures" @default.
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- W2086437326 doi "https://doi.org/10.1021/jp000714w" @default.
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