Organic Chemistry I, Saarland University, Campus Building C4.2, 66123, Saarbrücken, Germany.
Boehringer Ingelheim RCV GmbH & Co. KG, Dr. Boehringer-Gasse 5-11, 1121, Vienna, Austria.
Nat Commun. 2024 Mar 5;15(1):2005. doi: 10.1038/s41467-024-46218-7.
Antimicrobial resistance is a global health threat that requires the development of new treatment concepts. These should not only overcome existing resistance but be designed to slow down the emergence of new resistance mechanisms. Targeted protein degradation, whereby a drug redirects cellular proteolytic machinery towards degrading a specific target, is an emerging concept in drug discovery. We are extending this concept by developing proteolysis targeting chimeras active in bacteria (BacPROTACs) that bind to ClpC1, a component of the mycobacterial protein degradation machinery. The anti-Mycobacterium tuberculosis (Mtb) BacPROTACs are derived from cyclomarins which, when dimerized, generate compounds that recruit and degrade ClpC1. The resulting Homo-BacPROTACs reduce levels of endogenous ClpC1 in Mycobacterium smegmatis and display minimum inhibitory concentrations in the low micro- to nanomolar range in mycobacterial strains, including multiple drug-resistant Mtb isolates. The compounds also kill Mtb residing in macrophages. Thus, Homo-BacPROTACs that degrade ClpC1 represent a different strategy for targeting Mtb and overcoming drug resistance.
抗菌药物耐药性是一个全球性的健康威胁,需要开发新的治疗概念。这些概念不仅要克服现有的耐药性,还要设计成减缓新的耐药机制的出现。靶向蛋白降解是药物发现中的一个新兴概念,药物可以将细胞蛋白酶定向降解特定的靶标。我们通过开发靶向细菌的蛋白水解靶向嵌合体(BacPROTACs)来扩展这一概念,这些嵌合体与分枝杆菌蛋白降解机制的组成部分 ClpC1 结合。抗结核分枝杆菌(Mtb)的 BacPROTACs 源自环马菌素,当二聚化时,会产生招募和降解 ClpC1 的化合物。由此产生的 Homo-BacPROTACs 降低了分枝杆菌属中的内源性 ClpC1 水平,并在包括多重耐药 Mtb 分离株在内的分枝杆菌菌株中显示出低至微摩尔至纳摩尔范围的最小抑菌浓度。这些化合物还能杀死巨噬细胞内的 Mtb。因此,降解 ClpC1 的 Homo-BacPROTACs 代表了一种针对 Mtb 和克服耐药性的不同策略。
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