Peptide nucleic acids containing 2-pyrimidinone (P) and 3-oxo-2,3-dihydropyridazine (E) heterocycles recognized C–G and U–A inversions in a polypurine tract of double helical RNA with high affinity and sequence selectivity at pH 6.25. E-modified PNA bound strongly to bacterial A-site RNA, while no binding was observed to the human A-site RNA.
含有 2-
嘧啶酮(P)和 3-氧代-2,3-二氢
哒嗪(E)杂环的肽核酸能识别双螺旋 RNA 的多
嘌呤束中的 C-G 和 U-A 反转,在 pH 值为 6.25 时具有高亲和力和序列选择性。E 修饰的
PNA 与细菌的 A 位点 RNA 结合力很强,而与人类的 A 位点 RNA 则没有结合力。