Improved hybridisation potential of oligonucleotides comprising O-methylated anhydrohexitol nucleoside congeners |
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Authors: | Van Aerschot A Meldgaard M Schepers G Volders F Rozenski J Busson R Herdewijn P |
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Affiliation: | Laboratory of Medicinal Chemistry, Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium. arthur.vanaerschot@rega.kuleuven.ac.be |
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Abstract: | The hybridising potential of anhydrohexitol nucleoside analogues (HNAs) is well documented, but tedious synthesis of the monomers hampers their development. In a search for better analogues, the synthesis of two new methylated anhydrohexitol congeners 1 and 2 was accomplished and the physico-chemical properties of their respective oligomers were evaluated. Generally, oligonucleotides (ONs) containing the 3′-O-methyl derivative 1 showed a small increase in thermal stability towards complementary sequences as compared to HNA. Compared to the altritol modification, 3′-O-methylation seems to cause a small decrease in thermal stability of duplexes, especially when targeting RNA. These results suggest the possibility of derivatisation of the 3′-hydroxyl group of altritol-containing congeners without significantly affecting the thermal stability of the duplexes. The methyl glycosidic analogues 2 likewise increased the affinity for RNA in comparison with well-known HNA, while at the same time being economically more favorable monomers. However, homopolymers of 2 displayed self-pairing, but not so homopolymers of 1. Upon incorporation of the hexitols within RNA sequences in an effort to induce a beneficial pre-organised structure, the positive effect of the 3′-O-methyl derivative 1 proved larger than that of 2. |
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