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• W2020121619 abstract "The synthesis, biophysical, structural, and biological properties of both isomers of 3′-fluoro hexitol nucleic acid (FHNA and Ara-FHNA) modified oligonucleotides are reported. Synthesis of the FHNA and Ara-FHNA thymine phosphoramidites was efficiently accomplished starting from known sugar precursors. Optimal RNA affinities were observed with a 3′-fluorine atom and nucleobase in a trans-diaxial orientation. The Ara-FHNA analog with an equatorial fluorine was found to be destabilizing. However, the magnitude of destabilization was sequence-dependent. Thus, the loss of stability is sharply reduced when Ara-FHNA residues were inserted at pyrimidine-purine (Py-Pu) steps compared to placement within a stretch of pyrimidines (Py-Py). Crystal structures of A-type DNA duplexes modified with either monomer provide a rationalization for the opposing stability effects and point to a steric origin of the destabilization caused by the Ara-FHNA analog. The sequence dependent effect can be explained by the formation of an internucleotide C–F···H–C pseudo hydrogen bond between F3′ of Ara-FHNA and C8–H of the nucleobase from the 3′-adjacent adenosine that is absent at Py-Py steps. In animal experiments, FHNA-modified antisense oligonucleotides formulated in saline showed a potent downregulation of gene expression in liver tissue without producing hepatotoxicity. Our data establish FHNA as a useful modification for antisense therapeutics and also confirm the stabilizing influence of F(Py)···H–C(Pu) pseudo hydrogen bonds in nucleic acid structures." @default.
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• W2020121619 date "2011-09-22" @default.
• W2020121619 modified "2023-09-30" @default.
• W2020121619 title "Synthesis, Improved Antisense Activity and Structural Rationale for the Divergent RNA Affinities of 3′-Fluoro Hexitol Nucleic Acid (FHNA and Ara-FHNA) Modified Oligonucleotides" @default.
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• W2020121619 doi "https://doi.org/10.1021/ja207086x" @default.
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