An Antibacterial β-Lactone Kills Mycobacterium tuberculosis by Disrupting Mycolic Acid Biosynthesis
作者:Johannes Lehmann、Tan-Yun Cheng、Anup Aggarwal、Annie S. Park、Evelyn Zeiler、Ravikiran M. Raju、Tatos Akopian、Olga Kandror、James C. Sacchettini、D. Branch Moody、Eric J. Rubin、Stephan A. Sieber
DOI:10.1002/anie.201709365
日期:2018.1.2
potent anti‐mycobacterial and bactericidal activity. Chemical proteomics using an alkynylated probe identified Pks13 and Ag85 serine hydrolases as major targets. Validation through enzyme assays and customized 13C metabolite profiling showed that both targets are functionally impaired by the β‐lactone. Co‐administration with front‐line antibiotics enhanced the potency against M. tuberculosis by more than
抗生素抗性的传播是治疗结核分枝杆菌感染的主要挑战。另外,药物的功效常常受到肌膜通透性的限制。一线抗生素抑制肌膜生物合成,导致细胞快速死亡。受此机制的启发,我们将β-内酯用作推定的霉菌酸模拟物,以阻断参与其生物合成的丝氨酸水解酶。在一系列β-内酯中,我们发现一种具有强大的抗分枝杆菌和杀菌活性的产品。使用烷基化探针的蛋白质组学将Pks13和Ag85丝氨酸水解酶鉴定为主要靶标。通过酶分析验证和定制13C代谢产物谱分析表明,两个目标均受到β-内酯的功能损害。与一线抗生素共同给药可将抗结核分枝杆菌的效力提高100倍以上,从而证明了靶向肌膜生物合成丝氨酸水解酶的治疗潜力。