2â²-O-Methyl oligoribonucleotides with four kinds of 2â²-O-modified uridine derivatives were synthesised. Their duplex stability, hydration behavior and exonuclease resistance were studied by spectroscopic analyses and molecular dynamics simulations. Consequently, 2â²-O-modification of the uridine residue with 2-carbamoylethyl or 2-(N-methylcarbamoyl)ethyl groups resulted in a significant improvement of the exonuclease resistance without the loss of duplex stability.
合成了含有四种 2â²-O-修饰
尿苷衍
生物的 2â²-O-甲基寡核苷酸。通过光谱分析和分子动力学模拟研究了它们的双链稳定性、
水合行为和抗外切酶能力。结果表明,用 2-
氨基甲酰乙基或 2-(N-甲基
氨基甲酰)乙基对
尿苷残基进行 2â²-O修饰可显著提高抗外切酶能力,而不会降低双链的稳定性。