酸吸收与ROS耐受性的相互作用调节了细菌病变的产生
Min Jiao1, Wenbo He1, Zhenlin Ouyang1
1Center for Microbiome Research of Med-X Institute, Shaanxi Provincial Key Laboratory of Sepsis in Critical Care Medicine, The First Affiliated Hospital, Xi'an Jiaotong University, Xi'an 710061, China.
Science advances
|January 15, 2025
概括
通过ModA蛋白质吸收对于Acinetobacter baumannii的生长和感染至关重要. 它的结构显示出一种独特的二硫化物键,影响酸盐结合,提供一种潜在的抗菌标.
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:
- 是必不可少的微量元素,在几乎所有生命形式中作为重要的酶的辅因子起作用.
- 运输系统ModABC,利用周等离子体基质结合蛋白ModA,负责细菌中酸盐的吸收.
研究的目的:
- 研究ModA在Acinetobacter baumannii的生长,新陈代谢和氧化应激耐受性的作用.
- 阐明ModA的结构特征及其对酸盐结合和运输的影响.
- 评估ModA介导的基酸盐吸收在A. baumannii的发病过程中的意义.
主要方法:
- 采用X射线晶体学,确定了A. baumannii在减少和氧化状态中的酸盐结合的ModA的结构.
- 进行了生物化学测试,以测量酸盐结合亲和力,并评估二硫化键的功能影响.
- 用一种小鼠肺炎模型来评估ModA在A. baumannii感染中的作用.
主要成果:
- 发现ModA在细菌生长,代谢途径和对活性氧物种 (ROS) 的耐受性方面发挥着关键作用.
- 晶体结构揭示了A. baumannii ModA中非正规的二硫化键,导致减少和氧化状态之间的结构变化.
- 硫化物键形成显著降低了酸盐的结合亲和力,并影响了基质的特异性,而ModA介导的酸盐吸收对于小鼠模型中的感染至关重要.
结论:
- 该研究强调了酸盐吸收系统的结构和功能可塑性.
- ModA中的非正规二硫化键调节了酸盐结合亲和力,对A. baumannii的毒性很重要.
- ModA代表了开发针对A. baumannii感染的新型抗菌策略的潜在治疗标.
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