Staphylococcus aureus is a major bacterial pathogen that invades and damages host tissue by the expression of devastating toxins. We here performed a phenotypic screen of 35 molecules that were structurally inspired by previous hydroxyamide-based S. aureus virulence inhibitors compiled from commercial sources or designed and synthesized de novo. One of the most potent compounds, AV73, not only reduced hemolytic alpha-hemolysin production in S. aureus but also impeded in vitro biofilm formation. The effect of AV73 on bacterial proteomes and extracellular protein levels was analyzed by quantitative proteomics and revealed a significant down-regulation of major virulence and biofilm promoting proteins. To elucidate the mode of action of AV73, target identification was performed using affinity-based protein profiling (AfBPP), where among others YidC was identified as a target.
金黄色葡萄球菌是一种主要的细菌病原体,它通过表达破坏性毒素来入侵和破坏宿主组织。我们在此对 35 种分子进行了表型筛选,这些分子的结构灵感来自于以前从商业来源收集的基于羟基酰胺的
金黄色葡萄球菌毒力
抑制剂,或者是从新设计和合成的。其中最有效的化合物之一 AV73 不仅能减少
金黄色葡萄球菌溶血α-溶血素的产生,还能阻碍体外
生物膜的形成。通过定量蛋白质组学分析了 AV73 对细菌蛋白质组和细胞外蛋白质
水平的影响,结果显示主要毒力蛋白和
生物膜促进蛋白都出现了显著的下调。为了阐明 AV73 的作用模式,使用亲和蛋白图谱(Af
BPP)进行了靶标鉴定,其中 YidC 被鉴定为靶标。