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• W2055868776 abstract "The phosphoramidites of DNA monomers of 7-(3-aminopropyn-1-yl)-8-aza-7-deazaadenine (Y) and 7-(3-aminopropyn-1-yl)-8-aza-7-deazaadenine LNA (Z) are synthesized, and the thermal stability at pH 7.2 and 8.2 of anti-parallel triplexes modified with these two monomers is determined. When, the anti-parallel TFO strand was modified with Y with one or two insertions at the end of the TFO strand, the thermal stability was increased 1.2°C and 3°C at pH 7.2, respectively, whereas one insertion in the middle of the TFO strand decreased the thermal stability 1.4°C compared to the wild type oligonucleotide. In order to be sure that the 3-aminopropyn-1-yl chain was contributing to the stability of the triplex, the nucleobase X without the aminopropynyl group was inserted in the same positions. In all cases the thermal stability was lower than the corresponding oligonucleotides carrying the 3-aminopropyn-1-yl chain, especially at the end of the TFO strand. On the other hand, the thermal stability of the anti-parallel triplex was dramatically decreased when the TFO strand was modified with the LNA monomer analog Z in the middle of the TFO strand (ΔTm=-9.1°C). Also the thermal stability decreased about 6.1°C when the TFO strand was modified with Z and the Watson-Crick strand with adenine-LNA (A(L)). The molecular modeling results showed that, in case of nucleobases Y and Z a hydrogen bond (1.69 and 1.72Ǻ, respectively) was formed between the protonated 3-aminopropyn-1-yl chain and one of the phosphate groups in Watson-Crick strand. Also, it was shown that the nucleobase Y made a good stacking and binding with the other nucleobases in the TFO and Watson-Crick duplex, respectively. In contrast, the nucleobase Z with LNA moiety was forced to twist out of plane of Watson-Crick base pair which is weakening the stacking interactions with the TFO nucleobases and the binding with the duplex part." @default.
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• W2055868776 date "2015-05-01" @default.
• W2055868776 modified "2023-10-01" @default.
• W2055868776 title "Anti-parallel triplexes: Synthesis of 8-aza-7-deazaadenine nucleosides with a 3-aminopropynyl side-chain and its corresponding LNA analog" @default.
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• W2055868776 doi "https://doi.org/10.1016/j.bmc.2015.03.050" @default.
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