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在受体氨酸激酶中,跨膜域的自发二元化和明显的包装模式
Lev Levintov1, Biswajit Gorai2, Harish Vashisth1,3,4,5
1Department of Chemical Engineering and Bioengineering, University of New Hampshire, Durham, New Hampshire 03824, United States.
Biochemistry
|September 25, 2024
概括
胰岛素受体 (IR) 和胰岛素样生长因子-1受体 (IGF1R) 的跨膜域 (TMD) 自发二元化,采用不同的配置. 这种二分化对于理解受体激活机制至关重要.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 胰岛素受体 (IR) 和胰岛素样生长因子-1受体 (IGF1R) 是关键的跨膜糖蛋白,参与信号传导.
- 干结合诱导结构变化,可能导致跨膜域 (TMD) 分解和受体激活.
- 在IR/IGF1R激活中TMDs的作用及其在现实膜环境中的二元化倾向仍然不太清楚.
研究的目的:
- 研究IR和IGF1R跨膜域 (TMD) 的自发二元化.
- 探索IR和IGF1RTMD在二元化后采用的构造状态.
- 阐明TMD二元化在这些受体的激活机制中的作用.
主要方法:
- 使用粗粒度 (CG) 分子动力学模拟来研究IR/IGF1RTMD二分化.
- 在具有生理代表性脂质组成的血膜中模拟的TMDs.
- 分析了二分化倾向和由此产生的二分体配置.
主要成果:
- 红外和IGF1RTMD表现出自然倾向于自发二元化,无论最初的方向如何.
- 分度IRTMD主要形成X形配置,具有不对称的螺旋包装和显著的倾斜.
- 模块化IGF1RTMD采用对称的V形或平行配置,与膜正常相比倾斜最小或不倾斜.
结论:
- 红外和IGF1RTMD的自发二分化是一种基本性质.
- 截然不同的二次元配置表明TMD在IR和IGF1R的信号通路中具有独特的作用.
- 结果提供了对受体激活和潜在治疗点的结构基础的见解.
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