Synthesis of Oligonucleotides Containing the (4R) and (4S) Diastereoisomers of 4,8-Dihydro-4-hydroxy-8-oxo-2′-deoxyguanosine
作者:Anthony Romieu、Didier Gasparutto、Didier Molko、Jean-Luc Ravanat、Jean Cadet
DOI:10.1002/(sici)1099-0690(199901)1999:1<49::aid-ejoc49>3.0.co;2-i
日期:1999.1
8-dihydro-4-hydroxy-8-oxo-2′-deoxyguanosine, the two main singlet oxygen oxidation products of 2′-deoxyguanosine, (4R)-4-OH-8-oxodGuo (3a) and (4S)-4-OH-8-oxodGuo (3b), into oligonucleotides has been achieved by means of phosphoramidite chemistry using the solid-phase synthesis approach. The synthesis of the phosphoramidite synthons 8a and 8b required 6 steps from 2′-deoxyguanosine and involved the simultaneous
2,-脱氧鸟苷的两个主要单线态氧氧化产物4,4-8-二氢-4-羟基-8-氧代2'-脱氧鸟苷的(4 R)和(4 S)非对映异构体的插入(4 R)-4-OH-8-oxodGuo(3a)和(4 S)-4-OH-8-oxodGuo(3b),已通过亚磷酰胺化学方法使用固相合成方法实现了寡核苷酸合成。亚磷酰胺合成子8a和8b的合成需要从2'-脱氧鸟苷开始进行6个步骤,并且需要同时保护附加的叔羟基(4-OH)和N 2-通过乙酰化修饰的碱基的氨基。将修饰的亚磷酰胺8a,b有效地掺入几种寡核苷酸(3聚体,9聚体,14聚体和22聚体)中。合成低聚物中3a和3b的存在和完整性通过电喷雾电离质谱以及酶消化的HPLC和MALDI-TOF质谱分析进行了确认。使用各种酶,包括核酸内切酶(核酸酶P 1)和外切核酸酶(蛇毒磷酸二酯酶和小牛脾脏磷酸二酯酶)清楚地表明,3a,b与正常2'-脱氧核糖核苷之间的磷酸二酯键的酶促水解受到抑制。