Design, synthesis, conformational analysis and nucleic acid hybridisation properties of thymidyl pyrrolidine-amide oligonucleotide mimics (POM)Electronic supplementary information (ESI) available: experimental details (16 Figures, 3 Tables). See http://www.rsc.org/suppdata/ob/b3/b306156f/
作者:David T. Hickman、T. H. Samuel Tan、Jordi Morral、Paul M. King、Matthew A. Cooper、Jason Micklefield
DOI:10.1039/b306156f
日期:——
oligonucleotide mimics (POM) 1 were designed to be stereochemically and conformationally similar to natural nucleic acids, but with an oppositely charged, cationic backbone. Molecular modelling reveals that the lowest energy conformation of a thymidyl-POM monomer is similar to the conformation adopted by ribonucleosides. An efficient solution phase synthesis of the thymidyl POM oligomers has been developed, using
吡咯烷酰胺寡核苷酸模拟物(POM)1设计成与天然核酸在立体化学和构象上相似,但带有带相反电荷的阳离子主链。分子建模表明,胸苷基-POM单体的最低能量构象与核糖核苷采用的构象相似。利用N-烷基化和酰化偶联策略,开发了一种有效的溶液合成胸苷基POM低聚物的方法。1H NMR光谱证实,高度水溶性的胸苷二聚体T2-POM优先采用与吡咯烷N原子有关的构型和D2O中的总体构型,这些构型与RNA中的典型C3'-内切核苷酸非常相似。此外,胸苷五聚体T5-POM的核酸杂交特性 使用紫外光谱和表面等离振子共振(SPR)评估了带有N端邻苯二甲酰亚胺基团的N. 发现T5-POM对互补的ssDNA和RNA表现出非常高的亲和力,类似于T5-PNA寡聚物的亲和力。SPR实验还表明,T5-POM在接近生理条件下以高序列保真度与ssDNA结合。另外,发现可以通过改变离子强度和pH来减弱T5-POM与ssDNA和RNA的结合