An Integrated Biological Approach to Guide the Development of Metal-Chelating Inhibitors of Influenza Virus PA Endonuclease
作者:Annelies Stevaert、Salvatore Nurra、Nicolino Pala、Mauro Carcelli、Dominga Rogolino、Caitlin Shepard、Robert A. Domaoal、Baek Kim、Mercedes Alfonso-Prieto、Salvatore A. E. Marras、Mario Sechi、Lieve Naesens
DOI:10.1124/mol.114.095588
日期:2015.2
compare the inhibition of Mn(2+) versus Mg(2+), the latter probably being the biologically relevant cofactor. This real-time MB assay allowed us to measure the enzyme kinetics of PA-Nter or perform high-throughput screening. Several DKA derivatives were found to cause strong inhibition of PA-Nter, with IC50 values comparable to that of the prototype L-742,001 (i.e., below 2 μM). Among the different compounds
流感病毒PA核酸内切酶可裂解带帽的细胞前mRNA,从而引发病毒mRNA的合成,是新型抗流感病毒治疗方法的有希望的靶标。该酶的催化中心位于PA(PA-Nter)的N端,含有两个(或可能一个或三个)Mg(2+)或Mn(2+)离子,这对于其催化功能至关重要。对PA抑制剂的研究引起了极大的兴趣,这些抑制剂经过优化设计,可以占据活性位点并螯合金属离子。我们在这里集中于一系列包含不同支架的β-二酮酸(DKA)和DKA生物立体异构化合物,并在用PA-Nter的酶法测定中确定了它们的构效关系,以建立三维药效团模型。此外,我们开发了一种基于分子信标(MB)的PA-Nter分析,使我们能够比较Mn(2+)和Mg(2+)的抑制作用,后者可能是生物学上相关的辅助因子。这种实时MB检测使我们能够测量PA-Nter的酶动力学或进行高通量筛选。发现几种DKA衍生物可强烈抑制PA-Nter,IC50值可与原型L-742,