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We describe oligonucleotides (ODNs) that inhibit hepatitis C virus (HCV) RNA synthesis in vitro. From a series of 13 ODNs complementary to the 3'-end of the minus-strand HCV RNA, only 4 inhibited RNA synthesis with IC 50 values lower than 1 μM. The inhibition was sequence-specific, since no effect was observed when the ODNs were used with a noncomplementary template. The introduction...
Short nucleic acid hairpins (one or two base-pair stems) were strongly stabilized by simple chemical modifications. Non-nucleosidic pyrene or naphtalene diimide derivatives were appended at both 3' and 5' nearby ends of 2'-OMe RNA hairpins, yielding a very large increase in melting temperatures of the modified structures (from +21 to +55 o C). The excimer formation between the two consecutive...
Triple helical structures can be observed between double-stranded nucleic acids and a third strand through the formation of Hoogsteen hydrogen bond. We report here the use of quinazoline-2,4-dione derivatives as substitutes for thymine in TA * T triplets. The synthesis and the characterization of monochloro derivatives of quinazoline-2,4-dione as well as 5-fluoro and 6-nitro substituted quinazoline...
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