Influence of the Nucleobase and Anchimeric Assistance of the Carboxyl Acid Groups in the Hydrolysis of Amino Acid Nucleoside Phosphoramidates
作者:Munmun Maiti、Servaas Michielssens、Natalia Dyubankova、Mohitosh Maiti、Eveline Lescrinier、Arnout Ceulemans、Piet Herdewijn
DOI:10.1002/chem.201102279
日期:2012.1.16
some amino acid nucleoside phosphoramidates (aaNPs) can act as substrates for viral polymerases like HIV‐1 RT. Herein, we report the synthesis and hydrolysis of a series of new aaNPs, containing either natural or modified nucleobases to define the basis for their differential reactivity. Aqueous stability, kinetics, and hydrolysis pathways were studied by NMR spectroscopy at different solution pD values
核苷氨基磷酸酯(NPs)是一类核苷酸类似物,已被开发为潜在的抗病毒/抗肿瘤前药。最近,我们发现某些氨基酸核苷氨基磷酸酯(aaNPs)可以充当病毒聚合酶(如HIV-1 RT)的底物。在这里,我们报告了一系列新的aaNPs的合成和水解,这些aaNPs包含天然或修饰的核碱基,以定义其差异反应性的基础。在不同溶液pD值(5-7)和温度下,通过NMR光谱学研究了水的稳定性,动力学和水解途径。观察到动力学和机理(PN和/或P水解反应的O键裂解在很大程度上取决于核碱基和氨基酸部分的性质。发现天冬氨酰NPs比Gly或β-AlaNPs更具反应性。对于天冬氨酰NP,核碱基的反应顺序为1-去氮杂腺嘌呤> 7-去氮杂腺嘌呤>腺嘌呤>胸腺嘧啶≥3-去氮杂腺嘌呤。值得注意的是,即使在4°C下,Asp-1-deaza-dAMP的中性水溶液也会通过专有的PO键水解而自发降解(Asp-1-deaza-dAMP与Asp