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.
                            含有胸腺
嘧啶和2-
氨基吡啶(M)核碱基的肽核酸在生理条件下与双链RNA形成稳定且序列选择性的三重螺旋。M修饰的
PNA通过与同一DNA序列相比,具有两个数量级更高的双链RNA亲和力,表现出独特的RNA选择性。初步结果表明,核碱基修饰的
PNA可以结合和识别microRNA的双螺旋前体。