Shedding X-ray Light on the Role of Magnesium in the Activity of <i>Mycobacterium tuberculosis</i> Salicylate Synthase (MbtI) for Drug Design
作者:Matteo Mori、Giovanni Stelitano、Arianna Gelain、Elena Pini、Laurent R. Chiarelli、José C. Sammartino、Giulio Poli、Tiziano Tuccinardi、Giangiacomo Beretta、Alessio Porta、Marco Bellinzoni、Stefania Villa、Fiorella Meneghetti
DOI:10.1021/acs.jmedchem.0c00373
日期:2020.7.9
The Mg2+-dependent Mycobacterium tuberculosis salicylate synthase (MbtI) is a key enzyme involved in the biosynthesis of siderophores. Because iron is essential for the survival and pathogenicity of the microorganism, this protein constitutes an attractive target for antitubercular therapy, also considering the absence of homologous enzymes in mammals. An extension of the structure–activity relationships
Mg 2+依赖性结核分枝杆菌水杨酸酯合酶(MbtI)是参与铁载体生物合成的关键酶。由于铁对于微生物的存活和致病性至关重要,因此考虑到哺乳动物中不存在同源酶,这种蛋白质构成了抗结核治疗的诱人靶标。我们基于呋喃的候选物的构效关系的扩展使我们能够披露迄今为止已知的最有效的竞争性抑制剂(10,K i = 4μM),这对分枝杆菌培养物也证明是有效的。通过结构研究,我们表征了其意外的Mg 2+-独立绑定模式。我们还研究了Mg 2+辅助因子在催化中的作用,分析了MbtI–Mg 2+ –水杨酸酯三元配合物的第一晶体结构。总体而言,这些结果通过合理设计改良的MbtI抑制剂为新型抗结核药物的研发铺平了道路。