Recognition of CG interrupting site by W-shaped nucleoside analogs (WNA) having the pyrazole ring in an anti-parallel triplex DNA
作者:Yosuke Taniguchi、Yuko Uchida、Tomoko Takaki、Eriko Aoki、Shigeki Sasaki
DOI:10.1016/j.bmc.2009.08.040
日期:2009.10
three bases of the target duplex and the TFO, it was expected that replacement of the pyrimidine base of the WNA analog with a smaller pyrazole ring might avoid steric repulsion to produce a greater stability for the triplex. In this study, the new WNA analogs bearing the pyrazole ring, 3-aminopyrazole (AP), and 4-methyl-3-pyrazole-5-on (MP) were synthesized, incorporated into the TFOs, then their
我们先前已经开发出用于识别TA和CG中断位点的W形核苷类似物(WNA),这是天然三联体形成寡核苷酸(TFO)形成稳定三联体DNA的固有限制。但是,WNA的稳定作用取决于TFO中WNA类似物两侧的相邻核碱基。考虑到该碱基位于目标双链体和TFO的三个碱基构成的受阻位点,可以预期用较小的吡唑环取代WNA类似物的嘧啶碱基可避免空间排斥,从而产生更大的稳定性。三元组。在这项研究中,合成了带有吡唑环,3-氨基吡唑(AP)和4-甲基-3-吡唑-5-on(MP)的新WNA类似物,并整合到了TFO中,然后评估它们对三链体的稳定作用。事实证明,在3'G-WNA-G-5'序列中含有WNA-βAP的TFO形成了稳定的三链体,对CG中断位点具有选择性,而先前的WNA-βC并未诱导该三链体编队。