膜介导的机械刺激会在AT1受体中产生明显的活性类状态
Bharat Poudel1, Rajitha Rajeshwar T2, Juan M Vanegas3,4,5
1Materials Science Graduate Program, The University of Vermont, Burlington, VT, 05405, USA.
Nature communications
|August 4, 2023
概括
机械力量激活了 ангиотензин II 类型 1 (AT1) 受体,影响其结构和功能. 这项研究揭示了基于膜性质的独特活性构造,提供了对偏见激进主义的见解.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 计算生物物理学的计算生物物理学
背景情况:
- ангиотензин II 型 1 (AT1) 受体,一种 G 蛋白结合受体 (GPCR),在血管收缩等生理过程中至关重要.
- 众所周知,它可以通过激动剂 (例如, ангиотензинII) 和机械刺激 (例如,膜拉伸) 激活.
- 机械激活的结构基础及其与激素诱导激活的区别仍然不太清楚.
研究的目的:
- 使用计算模拟系统地描述在不同的膜环境和机械刺激下AT1受体的激活.
- 阐明机械力诱导的结构变化,并将其与激剂诱导的激活进行比较.
- 研究膜性质在调节AT1受体激活中的作用及其功能结果.
主要方法:
- 系统的AT1受体分子动力学模拟.
- 探索各种膜环境,不同的厚度和张力.
- 多微秒自由能量计算.
- 结构分析和不同受体构造的比较.
主要成果:
- AT1受体活性状态的稳定性受到膜厚度和张力的显著影响.
- 与激素诱导激活相比,AT1受体的独特活性构造来自膜介导激活.
- 自由能量计算揭示了非活性和各种活性状态的独特能量景观,支持不同的构造.
结论:
- 与激素结合相比,AT1受体的机械激活会导致独特的结构形状.
- 膜特性在决定AT1受体的激活途径和功能结果方面发挥着关键作用.
- 这些发现为AT1受体的机械激活和偏向激动提供了结构性的见解.
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