Synthesis and Hybridization Ability of Oligodeoxyribonucleotides Incorporating N-Acyldeoxycytidine Derivatives
作者:Takeshi Wada、Akio Kobori、Shun-ichi Kawahara、Mitsuo Sekine
DOI:10.1002/1099-0690(200112)2001:24<4583::aid-ejoc4583>3.0.co;2-r
日期:2001.12
structures as their most stable geometries. Detailed studies of the hydrogen-bond energy of the modified base pairs also suggested that the electronic repulsion between the heteroatom of the acyl group of X and the guanine residue resulted in significant destabilization of the X-G base pair and that the hydrogen-bond network structure of water molecules around the major groove of the DNA duplex is a key factor
通过在聚合物载体上使用新的对DBU不稳定的4,5-二氯邻苯二甲酰基连接基,已经合成了掺入各种N-酰基脱氧胞苷衍生物(X)的寡脱氧核苷酸[ 11a-i:d(T 6 XT 6)] 。借助于T m实验,检查了这些寡核苷酸与互补d(A 6 GA 6)的杂交能力。结果表明,DNA双链体的T m值随着引入DNA双链体的一条链中的脂族酰基中的亚甲基数目的增加而显着降低。从头算起MO计算和11 H NMR分析表明,被测衍生物中的酰基取向方式使得在分子内氢的帮助下,可以形成具有鸟嘌呤残基的常规沃森-克里克型(W-C型)碱基对酰胺羰基氧原子与N-酰基胞嘧啶残基的5-乙烯基质子之间的键。此外,发现所有芳族N-酰基均显着降低了DNA双链体的热稳定性。从头算计算表明,碱基对在4- N之间形成-酰基-1-甲基胞嘧啶衍生物和9-甲基鸟嘌呤具有完整的平面结构,这是它们最稳定的几何形状。对修饰的碱基对的氢键能的详细研究还表