尼尔2晶体结构揭示了ER-PM接触点的酸感应机制
Dongyoung Kim1,2, Seowhang Lee2, Youngsoo Jun3
1Department of Life Sciences, Korea University, Seoul 02841, South Korea.
概括
尼尔2蛋白在血膜上感知酸 (PA),以形成内质网膜-PM接触点. 这种相互作用对于维持依赖PI的信号通路至关重要...4,5) P2.2.
科学领域:
- 细胞生物学 细胞生物学
- 分子机制的分子机制
- 膜生物物理学 膜生物物理学
背景情况:
- 特定于酸的脂酶C (PLC) 激活在血膜中产生二甲糖醇 (DAG) 和酸 (PA).
- PYK2 N-终端域相互作用受体2 (Nir2) 通过膜接触点 (MCS) 连接了内细胞网膜 (ER) 和血膜 (PM).
- Nir2识别PA并与VAPs (囊泡相关的膜蛋白相关蛋白质) 相互作用,以调解ER-PM MCS的形成.
研究的目的:
- 阐明Nir2感知PA并与膜结合的分子机制.
- 了解Nir2在ER-PM MCS形成中的作用的结构基础.
主要方法:
- 尼尔2域的X射线晶体学 (LNS2,FFAT图案,DDHD域).
- 对Nir2-PA和Nir2-VAPB相互作用的结构分析.
- 通过其DDHD域对Nir2自我关联的分析.
主要成果:
- 尼尔2的C端LNS2域通过键直接结合PA.
- 在Nir2 (E355) 和VAPB (R55) 之间的盐桥对Nir2 FFAT-VAPB相互作用至关重要.
- 该DDHD域二元化,增强稳定的膜协会.
结论:
- Nir2的LNS2域直接感知PA,而它的DDHD域促进了膜结合.
- 与VAPB的FFAT图案相互作用对于连接ER和PM至关重要.
- 这些发现揭示了Nir2介导的ER-PM MCS形成如何维持PI(4,5) P2-依赖的PLC信号.
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