Discovery of an Acyclic Nucleoside Phosphonate that Inhibits<i>Mycobacterium tuberculosis</i>ThyX Based on the Binding Mode of a 5-Alkynyl Substrate Analogue
作者:Anastasia Parchina、Matheus Froeyen、Lia Margamuljana、Jef Rozenski、Steven De Jonghe、Yves Briers、Rob Lavigne、Piet Herdewijn、Eveline Lescrinier
DOI:10.1002/cmdc.201300146
日期:2013.8
by the results of the modeling and NMR studies, and inspired by the success of acyclic antiviral nucleosides, compounds where a 5‐alkynyl uracyl moiety is coupled to an acyclic nucleoside phosphonate (ANP) were synthesized and evaluated. Of the compounds evaluated, sodium (6‐(5‐(3‐octanamidoprop‐1‐yn‐1‐yl)‐2,4‐dioxo‐3,4‐dihydropyrimidin‐1(2H)‐yl)hexyl)phosphonate (3 e) exhibited 43 % of inhibitory effect
对新抗生素的迫切需求对靶向未开发的重要细胞过程提出了挑战。胸苷酸的生物合成就是这样一种过程,因为它在DNA复制和修复中起着至关重要的作用。胸苷酸合酶(TS)催化生物合成5-三磷酸胸苷(TTP)的关键步骤,这是DNA合成和修复所需的基本组成部分。迄今为止,由于TS抑制剂对人体酶和微生物酶的特异性不足,因此仅被成功用于抗癌治疗。但是,在一系列致病细菌中发现了一个新的TS酶家族(ThyX),该家族在结构和生化上与“经典” TS(ThyA)不同,这为开发选择性ThyX抑制剂作为有效的抗菌药物提供了可能。这里,1)用结核分枝杆菌从公开的晶体结构开始,使用分子模型探索ThyX酶,并通过NMR实验进一步证实。虽然化合物1的脱氧尿酸(dUMP)部分占据了ThyX中天然底物的腔,但其余的配体(“ 5-炔基尾巴”)延伸至酶的四个亚基中的两个之间。通过置换Tyr 44.C,Tyr 108.A和Lys 165.A