Structure-Guided Design of Novel Thiazolidine Inhibitors of <i>O</i>-Acetyl Serine Sulfhydrylase from Mycobacterium tuberculosis
作者:Ömer Poyraz、Variam Ullas Jeankumar、Shalini Saxena、Robert Schnell、Martin Haraldsson、Perumal Yogeeswari、Dharmarajan Sriram、Gunter Schneider
DOI:10.1021/jm400710k
日期:2013.8.22
catalyzes the formation of l-cysteine from O-acetyl serine and hydrogen sulfide. Here we report nanomolar thiazolidine inhibitors of Mycobacterium tuberculosis CysK1 developed by rational inhibitor design. The thiazolidine compounds were discovered using the crystal structure of a CysK1–peptide inhibitor complex as template. Pharmacophore modeling and subsequent in vitro screening resulted in an initial
在人类中不存在半胱氨酸的生物合成途径,但在微生物病原体中则是必不可少的,这表明它为新型抗菌化合物的开发提供了潜在的靶标。CysK1是磷酸吡哆醛依赖性ø -乙酰基硫化氢解酶,其催化形成升-半胱氨酸从ø -乙酰丝氨酸和硫化氢。在这里,我们报告通过合理的抑制剂设计开发的结核分枝杆菌CysK1的纳摩尔噻唑烷抑制剂。噻唑烷化合物是使用CysK1-肽抑制剂复合物的晶体结构作为模板而发现的。药效基团建模和随后的体外筛选产生了最初的命中化合物2(IC 50(103.8 nM),随后通过蛋白质晶体学,建模和合成化学的组合进行了优化。通过化学合成的2命中扩展导致了噻唑烷抑制剂的改进,最佳化合物的IC 50值为19 nM,效力比天然肽抑制剂(IC 50 2.9μM)高150倍。