Synthesis and duplex stability of oligonucleotides containing 7-vinyl-7-deazaguanine as a strong electron-donating nucleobase
作者:Akimitsu Okamoto、Toshiji Taiji、Kazuo Tanaka、Isao Saito
DOI:10.1016/s0040-4039(00)01815-3
日期:2000.12
7-vinyl-7-deazaguanine (vzG), an N7-modified guanine base, which has a smaller oxidation potential than G and 7-deazaG. The incorporation of vzG into oligonucleotides was achieved by phosphoramidite chemistry on a DNA synthesizer. The Tm of the duplex containing vzG was higher than that of the corresponding duplex containing G or 7-deazaG. The stabilization of the duplex containing vzG is due to the favorable enthalpy
我们合成了7-乙烯基-7-脱氮鸟嘌呤(vz G),这是一种N7修饰的鸟嘌呤碱基,其氧化电位比G和7-deazaG小。通过在DNA合成仪上的亚磷酰胺化学反应,将vz G掺入寡核苷酸中。含vz G的双链体的T m高于相应的含G或7-deazaG的双链体的T m。含vz G的双链体的稳定化是由于乙烯基和5'侧基之间的π堆积增加而产生的有利的焓变化。