(R)-4-(hydroxymethyl)triazol-1-ylmethyl, and (S)-guanidinylmethyl) triplex-forming peptide nucleic acids (TFPNAs) were synthesized and the effect of the backbone modifications on the binding to a miR-215 model was studied. Among the modifications, an appropriate pattern of three γ-(S)-guanidinylmethyl modifications increased the affinity and Hoogsteen-face selectivity for the miR-215 model without ternary
γ-修饰的(即(S)-
氨基甲基,(S)-乙酰
氨基甲基,(R)-4-(羟甲基)三唑-1-基甲基和(S)-
胍基甲基)三链体形成肽核酸(
TFPNAs)为合成并研究了骨架修饰对与miR-215模型结合的影响。在这些修饰中,三个γ-(S)-
胍基甲基修饰的适当模式可提高miR-215模型的亲和力和Hoogsteen-face选择性,而不会形成三元(
PNA)2 / RNA复合物。此外,观察到γ-(S)-
胍基甲基有助于
TFPNAs内在化成活的PC-3前列腺癌细胞。