Synthesis of Novel C4-Linked C<sub>2</sub>-Imidazole Ribonucleoside Phosphoramidite and Its Application to Probing the Catalytic Mechanism of a Ribozyme
作者:Lisa Araki、Keiji Morita、Maho Yamaguchi、Zheng-yun Zhao、Timothy J. Wilson、David M. J. Lilley、Shinya Harusawa
DOI:10.1021/jo802556s
日期:2009.3.20
The synthesis of a novel C4-linked C2-imidazole ribonucleoside phosphoramidite (ICN-C2-PA 1) with a two-carbon linker between imidazole and ribose moieties is described. In the phosphoramidite, POM and 2-cyanoethyl groups were selected to protect the endocyclic amine function of imidazole and the 2′-hydroxyl function of d-ribose, respectively. The C2-imidazole nucleoside, a flexible structural mimic
描述了新型 C4 连接的 C 2 -咪唑核糖核苷亚磷酰胺 (ICN-C 2 -PA 1 ) 的合成,在咪唑和核糖部分之间具有双碳连接器。在亚磷酰胺中,选择 POM 和 2-氰乙基基团分别保护咪唑的环内胺官能团和d-核糖的 2'-羟基官能团。C 2 -咪唑核苷是嘌呤核碱基的灵活结构模拟物,通过 2'-TBDMS 化学使用 ICN-C 2 -PA 1成功地掺入到 VS 核酶的 638 位,以研究 G638 在一般酸中的作用 -碱催化。修饰的 VS 核酶 (G638C 2Imz)表现出比用没有连接核糖和C4-咪唑的碳原子的C 0 -咪唑观察到的显着更高的催化活性。具有可变间隔长度的咪唑核苷类似物可以为探索核酶的催化机制提供有价值的通用方法。