可逆的脂质介导pH的连xin-46/50通过冷-EM-gating
Joshua M Jarodsky1,2, Janette B Myers1,2,3, Steve L Reichow1,2,3
1Department of Chemical Physiology and Biochemistry, Oregon Health and Science University, Portland, OR 97239, USA.
bioRxiv : the preprint server for biology
|February 24, 2025
概括
缺口结在酸性条件下关闭,这是一个涉及脂质和蛋白质域的过程. 连xin-46/50 (Cx46/50) 间隙连接处的这种pH调节机制对于细胞应激反应和预防白内障形成至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 由连接素蛋白形成的间隙结,调解细胞对细胞的通信.
- 这些通道对细胞内pH值敏感,在酸性条件下关闭,以在压力时保护组织.
- 素-46/50 (Cx46/50) 的调节失调与与年龄相关的白内障有关.
研究的目的:
- 为了阐明镜头Cx46/50间隙连接处pH-gating的结构机制.
- 了解脂质和蛋白质域如何相互作用以调节道功能,以应对pH值变化.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 确定本地Cx46/50间隙连接的结构.
- 分析的重点是轻度酸化引起的结构变化.
主要成果:
- 轻度酸化会触发脂质透到Cx46/50通道孔中.
- 脂质结合会取代N端 (NT) 域,稳定封闭状态.
- 道关涉及一组状态,包括可逆脂质参与和NT域移动.
结论:
- 脂质透是依赖pH值的隙结关闭的一个关键机制.
- 对Cx46/50 pH-gating的结构洞察力为其在细胞压力中的作用提供了分子基础.
- 了解Cx46/50门可能会为打击与年龄相关的白内障形成的策略提供信息.
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