在真菌细菌中通过核糖体分裂和rRNA破坏产生HflX介导的耐药性
Soneya Majumdar1, Amuliya Kashyap2, Ravi K Koripella1
1Division of Translational Medicine, Wadsworth Center, New York State Department of Health, Albany, NY 12237.
概括
菌根菌的HflX蛋白分裂了抗生素停滞的核糖体,产生不活跃的子单元,从而赋予抗生素耐药性. 这种独特的机制涉及独特的N端延伸和插入,甚至与结合的抗生素相互作用.
科学领域:
- 结构生物学是结构生物学.
- 分子微生物学分子微生物学
- 生物化学 生物化学
背景情况:
- HflX是一种保存的GTPase,参与核糖体救援和抗生素耐药性.
- 与同类相比,Mycobacterial HflX具有独特的结构特征 (N-终端延伸和插入).
- 菌根菌中的宏酸-林科萨米德耐药性与HflX功能有关.
研究的目的:
- 为了阐明与核糖体结合的真菌HflX的高分辨率结构.
- 揭示HflX介导的核糖体分裂和菌根菌中的抗生素耐药性的机制.
- 了解独特的真菌细菌HflX结构元素的作用.
主要方法:
- 低温电子显微镜 (cryo-EM) 在高分辨率.
- 用70S核糖体和50S子单元复合的HflX的结构分析.
- 在核糖体内对HflX-抗生素相互作用的研究.
主要成果:
- HflX的N端延伸障碍rRNA螺旋体,促进核糖体解离.
- HflX作为一种反关联因子,与自由的50S子单位结合.
- 在HflX中的一种特定于菌根菌的插入与类抗生素相互作用,表明了抗生素不可知论.
- HflX通过分裂停滞的核糖体和禁用50S子单元来调解抵抗.
结论:
- 在抗生素耐药性方面,Mycobacterial HflX采用了一种独特的核糖体分裂机制.
- N端延伸和特定插入对于菌根菌中的HflX功能至关重要.
- HflX与抗生素的相互作用表明,一种新的耐药性策略是独立于直接结合部位竞争的.
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