Synthesis, Duplex-Forming Ability, and Nuclease Resistance of Oligonucleotides Containing a Thymidine Derivative with a 1-Oxaspiro[4.5]decane Skeleton
作者:Takashi Osawa、Natsumi Yano、Hiroshi Aoyama、Satoshi Obika
DOI:10.1248/cpb.c22-00458
日期:2022.10.1
Chemically modified nucleic acids are essential for the therapeutic application of oligonucleotides. In this study, 6′-C-spiro-thymidine exhibiting a fixed torsion angle γ was designed, synthesized, and incorporated into oligonucleotides. The conformational analysis of the 6′-C-spiro-thymidine monomer revealed that its torsion angle γ was in the +synclinal range (approx. 60°), which is similar to that
化学修饰的核酸对于寡核苷酸的治疗应用至关重要。在本研究中,设计、合成了具有固定扭转角γ的6′- C-螺胸苷,并将其掺入寡核苷酸中。6'- C-螺胸苷单体的构象分析表明,其扭转角γ在+向斜范围内(约60°),这与天然RNA双链体中的扭转角类似,正如预期的那样。另一方面,已知 RNA 双链体的糖构象主要是 N 型,而合成单体的糖构象是 S 型。紫外熔解分析结果表明6'- C-螺胸苷的双链体形成能力低于天然DNA。相反,6'- C-螺胸苷可以增强寡核苷酸对核酸酶的稳定性。特别地,在寡核苷酸的3'末端掺入6'- C-螺胸苷显着增加了寡核苷酸的核酸酶抗性。 全尺寸图像