Synthesis and Conformational Properties of Oligonucleotides Incorporating 2‘-<i>O</i>-Phosphorylated Ribonucleotides as Structural Motifs of Pre-tRNA Splicing Intermediates
作者:Hiroyuki Tsuruoka、Koh-ichiroh Shohda、Takeshi Wada、Mitsuo Sekine
DOI:10.1021/jo991097e
日期:2000.11.1
blocks 6a-d having the bis(2-cyano-1,1-dimethylethoxy)thiophosphoryl (BCMETP) group were prepared according to our previous phosphorylation procedure. These phosphoramidite units 6a-d were not contaminated with 3'-regioisomers and were successfully applied to solid-phase synthesis to give oligodeoxyuridylates 15, 16 and oligouridylates 21, 22. Self-complementary Drew-Dickerson DNA 12mers 24-28 replaced
为了合成包含2'-O-磷酸基团的寡核苷酸,根据我们以前的方法制备了具有双(2-氰基-1,1-二甲基乙氧基)硫代磷酰基(BCMETP)的四种核糖核苷3'-亚磷酰胺基结构单元6a-d磷酸化程序。这些亚磷酰胺单元6a-d没有被3'-区域异构体污染,并成功地应用于固相合成,得到寡脱氧尿苷酸酯15、16和寡丁二酸酯21、22。自互补的Drew-Dickerson DNA 12mers 24-28被2取代。类似地合成了在各个位置的'-O-磷酸化的核糖核苷酸。在这些合成中,事实证明,KI(3)是最有效的试剂,用于将最初生成的硫代磷酸酯基团氧化为聚合物载体上的磷酸酯基团。在不使用该转化步骤的情况下,还合成了掺入2'-O-硫代磷酸化尿苷衍生物的三癸氧基尿苷酸17。为了研究2'-磷酸基团对DNA(RNA)双链体的热稳定性和3D结构的影响,对获得的自互补寡核苷酸进行T(m)测量,并对七聚体双链体33-36进行MD模拟。