Parallel Stranded DNA Stabilized with Internal Sugar Cross-Links: Synthesis and Click Ligation of Oligonucleotides Containing 2′-Propargylated Isoguanosine
作者:Suresh S. Pujari、Frank Seela
DOI:10.1021/jo4012706
日期:2013.9.6
solid-phase synthesis. A series of oligo-2′-deoxyribonucleotides with parallel (ps) and antiparallel (aps) strand orientation were constructed containing isoguanine-cytosine, isoguanine-isocytosine, and adenine-thymine base pairs. Complementary oligonucleotides with propargylated sugar residues were ligated in a stepwise manner with a chelating bis-azide under copper catalysis. Cross-links were introduced within
内部糖交联首次通过点击连接引入具有平行链取向的寡核苷酸中。为此,用可点击的炔丙基残基将异鸟苷核糖部分的2'-或3'-位置官能化,并且显着改善了炔丙基化胞嘧啶结构单元的合成。制备亚磷酰胺并用于固相合成。构建了具有平行(ps)和反平行(aps)链取向的一系列寡2'-脱氧核糖核苷酸,其包含异鸟嘌呤-胞嘧啶,异鸟嘌呤-异胞嘧啶和腺嘌呤-胸腺嘧啶碱基对。在铜催化下,将具有炔丙基化糖残基的互补寡核苷酸与螯合双叠氮化物逐步连接。交联被引入一个碱基对内或被两个碱基对隔开的位置。从T m稳定性研究表明,交联可稳定地稳定具有平行链取向的DNA(ΔT m从+16到+18.5°C),其增加幅度与aps DNA相似。