在多种药物排放中,Mg2+依赖的环境灵活性机制在多种药物排放中
Benjamin Russell Lewis1, Muhammad R Uddin2, Katie M Kuo3
1Department of Chemistry, Britannia House, 7 Trinity Street, King's College London, London, SE1 1DB, UK.
bioRxiv : the preprint server for biology
|June 25, 2024
概括
离子 (Mg2+) 稳定了阴性细菌中的AcrA蛋白,确保AcrAB-TolC多药物排泄在不同的pH条件下有效地运行. 这种稳定对于细菌在各种环境中的生存至关重要.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 像AcrAB-TolC这样的多种药物排泄对于格拉姆阴性细菌的生存至关重要,是多种药物耐药性的首要原因.
- 周等离子体位于细菌膜之间,具有独特的离子和pH环境,受外部条件的影响.
研究的目的:
- 研究离子 (Mg2+) 和pH之间的相互作用,调节周等离子适应蛋白AcrA.的动态和功能.
- 了解AcrA在不同环境条件下的AcrAB-TolC多药物排放活动中的作用.
主要方法:
- 在不同的Mg2+度和pH水平下研究了AcrA的结构动态.
- 确定了关键残留物,特别是胺残留物,负责AcrA的结构调节.
- 评估了这些动态对AcrAB-TolC整体流量活动的影响.
主要成果:
- 在没有Mg2+的酸性条件下,AcrA表现出更大的灵活性.
- 2+结合减轻了AcrA的灵活性,在中性到酸性环境中促进了特定的域组织.
- 发现一种独特的胺残留物可以引导这些结构变化,并在广泛的pH范围内保持功能.
结论:
- 2+对于保持AcrA的结构移动性至关重要,确保AcrAB-TolC在动态周等离子环境中发挥最佳功能.
- 这种Mg2+介导的调节对于细菌在感染和殖民期间的适应至关重要.
- 2+在这种类和潜在的其他周等离子体脂蛋白中起着显著的机械作用.
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