蛋白质动力学是热受体的强烈温度依赖的基础
Andrew Njagi Mugo1, Ryan Chou2, Feng Qin1
1Department of Physiology and Biophysical Sciences, State University of New York at Buffalo, Buffalo, NY 14214.
bioRxiv : the preprint server for biology
|November 22, 2024
概括
温度感应离子通道可能不遵循传统的全模型. 它们强烈的温度依赖与固有的热不稳定性和合通道蛋白的展开有关.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 离子通道生理学 离子通道生理学
背景情况:
- 离子通道通常是全osteric 蛋白质,其中刺激传感器域与打开门连接.
- 温度受体是一种暂时受体潜能 (TRP) 通道,对哺乳动物的热感觉有很强的温度依赖性.
- 这些通道中的温度传感器领域的确切性质尚不清楚.
研究的目的:
- 调查将温度传感与蛋白质热不稳定性联系在一起的假设的普遍性.
- 为温度感应离子通道中热过渡的合提供分子证据.
- 阐明蛋白质展开和相互作用网络在道关中的作用.
主要方法:
- 对TRPV1蛋白质进行直接热量测量.
- 分析野生类型和嵌合体通道结构.
- 测量热过渡峰值和激活热量.
主要成果:
- 野生类型的道显示单个协同的热过渡峰值,而嵌合体道显示多个峰值.
- 嵌合体通道中温度依赖的破坏与减少的激活度相关.
- 合蛋白展开到通道门增加了激活能量屏障,增强了温度依赖性.
结论:
- 在TRP通道中的温度传感与通道蛋白的固有热不稳定性密切相关.
- 靠近的N端作为协调通道激活的关键元素.
- 蛋白质内部的合相互作用网络是热敏离子通道中观察到的强烈温度依赖的基础.
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