April H Nguyen, Truc T Tran, Diana Panesso, Kara S Hood, Vinathi Polamraju, Rutan Zhang, Ayesha Khan, William R Miller, Eugenia Mileykovskaya, Yousif Shamoo, Libin Xu, Heidi Vitrac, Cesar A Arias
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引用次数: 0
摘要
达托霉素是一种最后的脂肽抗生素,会破坏细胞膜(CM)和肽聚糖的平衡。粪肠球菌已经开发出一种复杂的机制,通过重新分配细胞膜阴离子磷脂,使其远离隔膜,从而避免被达托霉素杀死。CM 的变化由一个名为 LiaFSR 的三组份调控系统协调,心磷脂合成酶(Cls)也可能参与其中。然而,LiaFSR 控制 CM 响应的机制以及 Cls 的作用尚不清楚。在这里,我们发现心磷脂合成酶的活性对阴离子磷脂的重新分布和达托霉素的抗性至关重要,因为缺失编码 Cls 的两个基因(cls1 和 cls2)会导致 CM 重塑。我们发现受 LiaFSR 调节的跨膜蛋白 LiaY 和 Cls1 是阴离子磷脂微域重新分布所需的 CM 重塑的重要介质。总之,我们的见解为肠球菌对细胞包膜抗生素的反应提供了一个可用于治疗的机理框架。
Molecular basis of cell membrane adaptation in daptomycin-resistant Enterococcus faecalis.
Daptomycin is a last resort lipopeptide antibiotic that disrupts cell membrane (CM) and peptidoglycan homeostasis. Enterococcus faecalis has developed a sophisticated mechanism to avoid daptomycin killing by re-distributing CM anionic phospholipids away from the septum. The CM changes are orchestrated by a three-component regulatory system, designated LiaFSR, with a possible contribution of cardiolipin synthase (Cls). However, the mechanism by which LiaFSR controls the CM response and the role of Cls are unknown. Here, we show that cardiolipin synthase activity is essential for anionic phospholipid redistribution and daptomycin resistance since deletion of the two genes (cls1 and cls2) encoding Cls abolished CM remodeling. We identified LiaY, a transmembrane protein regulated by LiaFSR, and Cls1 as important mediators of CM remodeling required for re-distribution of anionic phospholipid microdomains. Together, our insights provide a mechanistic framework on the enterococcal response to cell envelope antibiotics that could be exploited therapeutically.
期刊介绍:
JCI Insight is a Gold Open Access journal with a 2022 Impact Factor of 8.0. It publishes high-quality studies in various biomedical specialties, such as autoimmunity, gastroenterology, immunology, metabolism, nephrology, neuroscience, oncology, pulmonology, and vascular biology. The journal focuses on clinically relevant basic and translational research that contributes to the understanding of disease biology and treatment. JCI Insight is self-published by the American Society for Clinical Investigation (ASCI), a nonprofit honor organization of physician-scientists founded in 1908, and it helps fulfill the ASCI's mission to advance medical science through the publication of clinically relevant research reports.