通过非同源响应调节器隔离丁激酶,为细菌双组分信号传递建立了刺激的值水平
Gaurav D Sankhe1, Rubesh Raja2, Devendra Pratap Singh3
1Centre for Biosystems Science and Engineering, Indian Institute of Science, Bengaluru, India.
Nature communications
|July 25, 2023
概括
细菌的两组系统 (TCS) 使用非同源响应调节器 (RRs) 来隔离化传感器胺激酶 (HK~Ps). 这种机制防止TCS对弱信号过度反应,保持细菌的健康.
科学领域:
- 微生物学 微生物学
- 系统生物学 系统生物学
- 生物化学 生化学
背景情况:
- 细菌的两组系统 (TCS) 调节基因表达,以响应环境信号.
- 在TCS的积极自我调节增强了灵敏度,但风险过度响应弱刺激,可能会损害细菌的健康.
- 了解防止这种过度反应的调节机制对于细菌生理学至关重要.
研究的目的:
- 调查一种一般设计原则,防止细菌TCS中不成比例的大响应.
- 阐明非同源响应调节器 (RRs) 在调节传感器胺激酶 (HK) 活性中的作用.
- 分析RR-HK相互作用对TCS敏感性和细菌适应性的影响.
主要方法:
- 来自Mycobacterium tuberculosis的五种TCS的实验性表征.
- 在体外结合试验测试以确定化HKs (HK~Ps) 对同源和非同源RRs的亲和力.
- 数学建模以模拟TCS动态和响应值.
- 在Mycobacterium bovis BCG中构建可调的表达系统,以验证体内发现的结果.
主要成果:
- 所有五个研究的来自M.结核病的TCS都具有非亲属RR,与其亲属RR相比,对HK~Ps的亲和力更高.
- 实验室试验证实了HK~Ps与更高亲和度的非同类RRs的优先结合,导致其隔离.
- 数学模型预测,这种封存引入了一个刺激值,防止对弱信号的反应.
- 在体内实验表明,高亲和度非同类RRs有效抑制TCS反应.
结论:
- 非同源性RRs封存化HKs是防止TCS对弱信号过度响应的一般机制.
- 这种调节策略通过避免对非显著刺激的有害反应来提高细菌的健康状况.
- 这些发现提供了对细菌信号传导的复杂调节网络的洞察.
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