Inhibition of Calcium Dependent Protein Kinase 1 (CDPK1) by Pyrazolopyrimidine Analogs Decreases Establishment and Reoccurrence of Central Nervous System Disease by <i>Toxoplasma gondii</i>
作者:Florentine U. Rutaganira、Jennifer Barks、Mary Savari Dhason、Qiuling Wang、Michael S. Lopez、Shaojun Long、Joshua B. Radke、Nathaniel G. Jones、Amarendar R. Maddirala、James W. Janetka、Majida El Bakkouri、Raymond Hui、Kevan M. Shokat、L. David Sibley
DOI:10.1021/acs.jmedchem.7b01192
日期:2017.12.28
structure–activity relationships of a series of pyrazolopyrimidine inhibitors of CDPK1 with the goal of increasing selectivity over host enzymes, improving antiparasite potency, and improving metabolic stability. The resulting lead compound 24 exhibited excellent enzyme inhibition and selectivity for CDPK1 and potently inhibited parasite growth in vitro. Compound 24 was also effective at treating acute toxoplasmosis
钙依赖性蛋白激酶1(CDPK1)是机会病原体弓形虫中的必需酶。CDPK1控制着多个过程,这些过程对于弓形虫的细胞内复制周期至关重要,包括粘附素的分泌,运动性,侵袭和流出。值得注意的是,CDPK1在ATP结合袋中包含一个小的甘氨酸守卫残基,使其对具有与该扩展的结合袋互补的大取代基的ATP竞争性抑制剂敏感。在这里,我们探索了一系列CDPK1的吡唑并嘧啶抑制剂的结构-活性关系,目的是提高对宿主酶的选择性,提高抗寄生虫的效力,并改善代谢稳定性。所得的铅化合物24表现出优异的酶抑制作用和对CDPK1的选择性,并在体外有效抑制了寄生虫的生长。化合物24也可有效治疗小鼠急性弓形体病,减少向中枢神经系统的扩散以及减少严重免疫受损的小鼠中慢性感染的再激活。这些发现为开发用于治疗中枢神经系统弓形体病的CDPK1小分子抑制剂提供了概念验证。