从Acinetobacter baumannii多种药物排泄AdeB的联结位点之间的非添加功能相互作用
Inga V Leus1, Sean R Roberts1, Anhthu Trinh1
1Department of Chemistry and Biochemistry, University of Oklahoma , Norman, Oklahoma, USA.
Journal of bacteriology
|October 18, 2023
概括
这项研究揭示了Acinetobacter baumannii中独特的药物排放机制,表明AdeB载体的突变可以改变抗生素耐药性,有时会增加敏感性.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 多种药物排泄,特别是耐药结节分裂 (RND) 超级家族,是抗生素耐药性的关键,在病原体如Acinetobacter baumannii.
- 由内膜输送器 AdeB 驱动的 AdeABC 排泄,通过挤出各种化合物来赋予多药性耐药性.
- 之前的研究表明,AdeB具有独特的联结特性,每个原质体最多可以结合三个联结体.
研究的目的:
- 为了研究 AdeB 载体的基质转移机制.
- 探索AdeB的结合位之间的功能相互作用.
- 为了确定影响AdeB在抗生素耐药性中的作用的特定突变.
主要方法:
- 引入单和双氨基酸替代物到AdeB载体的已识别的配体结合位点.
- 对产生的Acinetobacter baumannii菌株表型的分析,这些AdeB变异过度产生.
- 评估抗生素敏感性和耐药性概况的变化.
主要成果:
- 阿德B的基底转位机制与其他特征化的RND传送器有很大的不同.
- 在AdeB的绑定站点之间的功能相互作用是非添加的,表明一个独特的操作模式.
- 鉴定出了导致抗生素敏感性降低或增加的突变,其中一些变异使细菌比流失缺陷菌株更容易受到感染.
结论:
- AdeB采用了一种独特的多药转移机制,与其他RND传送器中看到的旋转模式不同.
- 在AdeB内部的联结位点以非添加方式功能互连.
- 针对AdeB中的特定部位提供了潜在的策略,以恢复Acinetobacter baumannii感染中的抗生素敏感性.
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