输送器过量和集群使适应蛋白转移为细菌排放流的转移更加容易
Wenyao Zhang1,2,3,4, Christine E Harper5,6,7,4, Junsung Lee5,6
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
概括
研究人员在细菌多药物排泄中发现了一种穿机制,涉及过多的MacB转运器和动态的MacA适应蛋白. 这一发现为打击抗生素耐药性的新策略提供了机会.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 多种药物排泄对于细菌的生存至关重要,它们赋予抗生素耐药性,并有助于毒性因子挤出.
- 在阴性细菌中,MacAB-TolC组件 (MacA6:MacB2:TolC3) 是一个关键的排泄系统.
- 了解这种组合的动态对于开发新的抗微生物战略至关重要.
研究的目的:
- 为了研究E. coli中的MacAB-TolC流量组合的固体测量和动态.
- 阐明过多的输送蛋白和适应蛋白在流量效率中的作用.
- 探索破坏多种药物排放和克服抗生素耐受性的潜在目标.
主要方法:
- 使用了定量单分子,单细胞成像技术.
- 该研究使用大肠杆菌作为模型生物体.
- 基于微流体的挤压负荷被用来扰乱排水系统.
主要成果:
- 与限制性MacA适配蛋白相比,观察到MacB (和TolC) 的显著过量.
- 过剩的MacB传送器在MacAB-TolC组件周围动态聚集.
- 马卡从组件中动态分解,揭示了一个适应蛋白穿机制,用于高效的周等离子体基质封存.
- 化学或物理干扰,包括微流体,可以破坏MacB聚类和MacAB-TolC组合,从而损害抗生素耐受性.
结论:
- 该MacAB-TolC流量系统运行与多余的组件和动态适应蛋白穿,以高效的基板流量.
- 扰乱这些排泄的动态组装和聚类可以降低细菌的抗生素耐受性.
- 这些发现为多种药物排放的机制提供了新的见解,并为抗菌药物开发提供了潜在的途径.
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