形成三链体的寡核苷酸(TFO)可能是用于基因治疗和特定基因修饰的有用分子工具。但是,未修饰的TFO具有两个严重的缺点:较低的结合亲和力和较高的序列依赖性。在本文中,我们提出了一种新策略,该策略使用一组新的修饰的核碱基进行TFO的四碱基识别,从而克服了这两个缺点。包含2'-脱氧4N-(2-胍基乙基)-5-甲基胞嘧啶(d g C)残基的CG碱基对的TFO比包含2'-OMe-4N-(2-胍基乙基)-5-甲基胞苷(2'-OMe g C),2'-OMe-4N-(2-胍基乙基)-5-甲基-2-硫胞苷(2'-OMe g C s),d gC和4S-(2-胍基乙基)-4-硫代胸苷(gs T)。此外,我们观察到,与dG和其他DNA衍生物相比,N-乙酰基2,7-二氨基-1,8-萘啶(DA N ac)对TA碱基对具有更高的结合和碱基识别能力。在此知识的基础上,我们成功合成了包含DA N ac,d g C,2'-OMe-2-硫代胸苷(2'-OMe
Ethyl[2-Deoxy-5-O-(4,4′-dimethoxytrityl)-α- and β-D-erythro-Pentofuranosyl] Acetates as Versatile Intermediates in Nucleic Acid Chemistry
摘要:
The title compounds (1a,b) were synthesized in three steps from 2-deoxy-D-ribose, and used in the preparation of oligonucleotide conjugates, branched oligonucleotides as well as homo-N-nucleosides.
Zn<sup>2+</sup>Complexes of 3,5-Bis[(1,5,9-triazacyclododecan-3-yloxy)methyl]phenyl Conjugates of Oligonucleotides as Artificial RNases: The Effect of Oligonucleotide Conjugation on Uridine Selectivity of the Cleaving Agent
The deprotected conjugates were purified by HPLC, and their ability to cleave a complementary RNA containing either uridine or some other nucleoside at the potential cleaving site was compared. Somewhat unexpectedly, conjugation to an oligonucleotide did not enhance the catalytic activity of the Zn2+bis(azacrown) complex and virtually abolished its selectivity towards the uridine sites.
Design of artificial nucleobases for the recognition of the AT inversion by triple-helix forming oligonucleotides: A structure–stability relationship study and neighbour bases effect
We report herein on the synthesis, the incorporation into triplex formingoligonucleotides (TFO) and the recognition properties of a series of synthetic nucleosides designed for the specific recognition of an inverted A x T base pair in a pyrimidine triplehelix motif. These analogues were designed on the basis of the results obtained with our previously reported compounds S and B(t), in order to define
我们在此报告了合成,掺入三链体形成寡核苷酸(TFO)以及一系列合成核苷的识别特性,这些序列设计用于特异性识别嘧啶三链螺旋基序中的反向A x T碱基对。这些类似物是根据我们先前报道的化合物S和B(t)获得的结果设计的,目的是定义结构稳定性关系。我们还报告了在含S的TFO的情况下,侧接S的碱基的化学性质的影响,以便获得有关A x TxS三元组内识别过程的更多信息。这项研究为更有效的类似物的概念建立了指南,以识别A x T和G x C反向碱基对。