Synthesis and hybridization properties of<scp>l</scp>-oligodeoxynucleotide analogues fixed in a low anti glycosyl conformation
作者:Hidehito Urata、Hidetaka Miyagoshi、Tetsuya Kumashiro、Takashi Yumoto、Keiji Mori、Keiko Shoji、Keigo Gohda、Masao Akagi
DOI:10.1039/b312276j
日期:——
We have synthesized L-type enantiomers (cU and cA) of nucleoside analogues, whose glycosyl bonds are fixed in a low anti conformation (ap glycosyl conformation, χ
≈ 180°), and incorporated them into oligonucleotides to evaluate the hybridization ability with natural DNA and RNA sequences. Although the incorporation of the modified nucleosides into oligonucleotides decreased the hybridization ability with unmodified complementary DNA sequences, the fully-substituted 12mers (cU12 and cA12) still retained the hybridization ability with the complementary unmodified DNA 12mers, regardless of their unnatural L-chirality. In contrast, cU12 and cA12 showed different hybridization behavior with complementary unmodified RNA 12mers. cU12 forms a more stable duplex with rA12 than the corresponding natural 12mer (dT12), whereas cA12 cannot hybridize with rU12. Based on the model structure of cU12–rA12, we discuss these experimental results.
我们合成了核苷类似物的 L 型对映体(cU 和 cA),其糖基键以低反构象(ap 糖基构象,χ ≈ 180°)固定,并将其加入寡核苷酸中,评估其与天然 DNA 和 RNA 序列的杂交能力。虽然将修饰的核苷掺入寡核苷酸中会降低与未修饰的互补 DNA 序列的杂交能力,但完全取代的 12 聚体(cU12 和 cA12)仍能保持与未修饰的互补 DNA 12 聚体的杂交能力,而不管它们的非天然 L 手性如何。cU12 与 rA12 形成的双链比相应的天然 12 聚体(dT12)更稳定,而 cA12 则不能与 rU12 杂交。基于 cU12-rA12 的模型结构,我们对这些实验结果进行了讨论。