A new oligonucleotide analog, bicyclo[3.2.1]-amide-DNA was synthesized. A homo-adenylate sequence of this analog, efficiently forms hetero-duplexes with complementary natural DNA and RNA. The corresponding homo-thymidylate sequence, however, does not base-pair to complementary DNA and RNA, but forms a stable duplex with the homo-adenylate oligomer of the same backbone type. The structure of this duplex is virtually enantiomeric to that of a natural B-DNA, as inferred from CD-spectroscopy.
我们合成了一种新的寡核苷酸类似物--双环[3.2.1]酰胺-DNA。这种类似物的同源
腺苷酸序列能有效地与互补的天然 DNA 和 RNA 形成异源双链。然而,相应的
胸苷酸同源序列不会与互补 DNA 和 RNA 发生碱基配对,而是与相同骨架类型的
腺苷酸同源寡聚体形成稳定的双链体。根据 CD 光谱推断,这种双链体的结构与天然 B-DNA 的结构几乎是对映的。