来自大肠杆菌的转录因子CsqR (YihW) 的细胞系和结构建模
Anna A Rybina1, Roman A Glushak2, Tatiana A Bessonova3
1Skolkovo Institute of Science and Technology, Moscow, Russia, 121205. rybinaann@gmail.com.
Scientific reports
|April 3, 2024
概括
大肠杆菌中的转录因子CsqR (YihW) 有两种形式,CsqR-l和CsqR-s.CsqR-s被硫基诺激活,并表现出影响基因调节的结构变化.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- CsqR (YihW) 是一种调节yih基因的转录因子,它参与了大肠杆菌中硫基诺酸降解的过程.
- 之前的研究表明,乳糖可能会调节yih基因带的表达.
研究的目的:
- 研究CsqR转录因子的遗传学和功能特征.
- 了解 CsqR 功能及其与潜在效应者的相互作用的结构基础.
主要方法:
- 遗传学分析以确定保存的特征.
- 西方涂抹检测不同的CsqR蛋白质形式.
- 分子动力学模拟以建模蛋白质结构和构造变化.
- 分子建模以模拟与CsqR的效应器相互作用.
主要成果:
- 遗传学分析证实了CsqR中保存的Met25.
- 西方斑点发现了两种CsqR形式:CsqR-l (28.5 kDa) 和CsqR-s (26 kDa),起源于Met25.
- 在硫基诺的生长过程中,CsqR-s表现出激活,并在丰富介质上的静止阶段取代了CsqR-l.
- 分子动力学模拟确定了两个CsqR状态 (无序循环或α螺旋链接器),使得构造切换 ("开放"和"紧").
- 建模表明,所有测试的效应剂 (硫基诺,硫胺,硫基诺基醇,乳糖) 都与CsqR-l的同一个口袋结合,但CsqR-s根据其链接结构提供了两个结合选项.
结论:
- CsqR存在于两个功能性异构体中,具有不同的激活和调节作用.
- 由其链接区域驱动的CsqRs的结构灵活性对其监管活动至关重要.
- CsqR与各种硫化合物和乳糖的相互作用是由其结构状态调节的,为基因调节机制提供了洞察力.
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