Oligonucleotides containing 4â²-carboxy-, 4â²-methoxycarbonyl-, 4â²-carbamoyl-, and 4â²-methylcarbamoyl-thymidines, and their 2â²-methoxy, 2â²-amino or 2â²-acetamido analogs were prepared. Their duplex-forming ability with DNA and RNA complements was evaluated by UV melting experiments. Interestingly, 4â²-carboxythymidine existing in the S-type sugar conformation was found to lead to an increase in the stability of the duplex formed with RNA complements compared to natural thymidine.
制备了含有 4â²-羧基、4â²-甲氧基羰基、4â²-
氨基甲酰基和 4â²-甲基
氨基甲酰基胸腺
嘧啶及其 2â²-甲氧基、2â²-
氨基或 2â²-乙酰
氨基类似物的寡核苷酸。通过紫外熔融实验评估了它们与 DNA 和 RNA 互补形成双链的能力。有趣的是,与天然
胸苷相比,以 S 型糖构象存在的 4â²-羧基
胸苷能提高与 RNA 互补体形成的双链体的稳定性。