Peptide nucleic acids containing thymidine and 2-aminopyridine (M) nucleobases formed stable and sequence selective triple helices with double stranded RNA at physiologically relevant conditions. The M-modified PNA displayed unique RNA selectivity by having two orders of magnitude higher affinity for the double stranded RNAs than for the same DNA sequences. Preliminary results suggested that nucleobase-modified PNA could bind and recognize double helical precursors of microRNAs.
在生理相关条件下,含有
胸苷和 2-
氨基吡啶(M)核碱基的肽核酸与双链 RNA 形成了稳定且具有序列选择性的三螺旋。 M 修饰的
PNA 对双链 RNA 的亲和力比对相同 DNA 序列的亲和力高两个数量级,显示出独特的 RNA 选择性。 初步结果表明,核碱基修饰的
PNA 可以结合并识别 microRNA 的双螺旋前体。