在循环条件下,单分子可视化ECF输送器复合体的亚单元组合的ATP诱导动力学
Solène N Lefebvre1, Mark Nijland1, Ivan Maslov1
1Faculty of Science and Engineering, Groningen, Biomolecular Sciences and Biotechnology, Membrane Enzymology Group, University of Groningen, Groningen, The Netherlands.
Nature communications
|May 13, 2025
概括
能量合因子 (ECF) 载体对于细菌的营养吸收至关重要,可以使用动态机制. 我们的研究表明,在运输过程中,维生素B12载体CbrT与其电机解离并重新关联.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 微生物学 微生物学
背景情况:
- 能量合因子 (ECF) 运输体是ATP结合盒 (ABC) 运输体,对于 prokaryotic 吸收必需的维生素和辅助因子至关重要.
- 这些载体参与了细菌的毒性,并代表了潜在的抗微生物点.
- 一种拟议的传输机制涉及基质转移子单元 (S组件) 与ATP化电机 (ECF模块) 的动态关联和解离,尽管这种模型在生理条件下缺乏验证.
研究的目的:
- 在模仿活性运输的条件下,在膜环境中研究维生素B12ECF载体CbrT的构造动态.
- 阐明ECF载体的基质转移机制,特别关注S组件和ECF模块之间的相互作用.
主要方法:
- 利用单分子光谱学来监测ECF-CbrT载体的构造变化和相互作用.
- 在设计用于支持载体运输的膜系统中进行了实验,在不同的条件下,包括维生素B12的存在和缺乏.
主要成果:
- 观察到CbrT S组件与ECF模块的ATP水解依赖解离和重新关联.
- 这些动态相互作用发生不论维生素B12的存在,表明一个徒劳的ATP水解周期.
- 观察到的形状动态与驱逐和重新获得S元件作为运输过程的核心部分是一致的.
结论:
- S组件与ECF模块的动态关联和分离是ECF传送机制的一个组成部分.
- ECF传送器可以采用一种涉及循环S成分释放和结合的机制,加上ATP水解,以实现基质转移.
- 这些发现为ECF载体的分子机制提供了关键的见解,支持它们作为抗菌目标的潜力.
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