通过Prickle2 LIM域的紧张性动因结合及其在全长蛋白质中的调节
Vidal Bejar-Padilla1,2, Mindy Li1,2, Jeanne C Stachowiak2,3
1Department of Molecular Biosciences, University of Texas, Austin, TX 78712, USA.
Molecular biology of the cell
|October 29, 2025
概括
皮克尔2的LIM域含有区域与紧张的活性纤维结合. 全长的Prickle2及其变体抑制了这种结合,为细胞力学和极性调节提供了洞察力.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 发展生物学 发展生物学
背景情况:
- 细胞利用感应力的活性蛋白结合蛋白来检测细胞骨网络中的机械变化.
- 众所周知,Lin11,Isl-1和Mec-3 (LIM) 域直接与紧张的活性纤维结合,介导力传感.
- 在全长蛋白质中,LIM域与actin相互作用的调节仍然不完全理解.
研究的目的:
- 在全长蛋白质的背景下,研究LIM域与actin相互作用的调节.
- 为了确定平面细胞极性蛋白Prickle2 (Pk2) 如何与紧张的活性丝相互作用.
- 探索Pk2变体对actin招募的功能影响.
主要方法:
- 使用Xenopus mesoderm探头观察蛋白质局部化 in vivo.
- 进行了Prickle2域 (LCR,PET,C端区域) 的结构功能分析.
- 研究了Prickle2的PET域与其他细胞骨蛋白质的LIM域融合的影响.
- 分析了与相关的人类患者衍生Pk2变体.
主要成果:
- Pk2的LIM域含有区域 (LCR) 与Xenopus中皮中的紧张的活性纤维有关.
- 与其单独的LCR相比,全长的Pk2显示了对应变的活性纤维的抑制招募.
- 发现Pk2的PET域和C终端区域抑制了LCR对应变性actin的招募,促进了对Pk2丰富节点的招募.
- 融合实验证明了PET域对LIM域招募的上下文依赖的抑制.
- 人类相关的Pk2变体表现出Pk2-LCR招募到actin纤维的损失.
结论:
- 应变敏感的LIM域与actin的相互作用是由其他蛋白质域在全长环境中调节的.
- 皮克尔2的PET和C端区域在调节LCR与应变性actin的关联方面发挥着至关重要的作用.
- 像在变异中看到的Pk2-actin相互作用的失调可能会影响细胞机械感应和平面细胞极性.
- 这些发现为控制力敏感蛋白相互作用及其细胞影响的机制提供了新的见解.
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