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Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

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通过WNK激酶进行水静压传感.

John M Humphreys1, Liliana R Teixeira1, Radha Akella1

  • 1Department of Biophysics, The University of Texas Southwestern Medical Center, Dallas, TX 75390.

Molecular biology of the cell
|August 16, 2023
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概括

水位压力改变了WNK3 (没有氨酸激酶3) 的结构,从二聚体变成单聚体,影响了它的活性. 这揭示了WNK激酶如何感知和响应物理力量的新机制.

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科学领域:

  • 生物化学 生物化学
  • 细胞生物学 细胞生物学
  • 生物物理学的生物物理.

背景情况:

  • WNK激酶 (无素激酶) 是已建立的透传感器,参与细胞体积调节.
  • WNK 激酶也可能对水静压,一个物理细胞压力因素敏感.

研究的目的:

  • 为了研究水静压对WNK3激酶结构和活性的影响.
  • 探索将水静压激活与WNK透感应联系在一起的潜在机制.

主要方法:

  • 在实验室中使用纯化的WNK3激酶域 (uWNK3) 的研究.
  • 使用N2气的液压压力 (190kPa) 的应用.
  • 使用大小排除色谱-多角度光散射 (SEC-MALS),SEC,分析超离心 (AUC),NMR和化学交联的结构分析.

主要成果:

  • 水定压力改变了uWNK3的寡合结构,从二聚体变成单聚体.
  • 压力诱导的结构变化与由氧化物诱导的结构变化相似.
  • uWNK3的自酸化和活性由水静压增强,尽管比细胞环境中观察到的要少.

结论:

  • 水静压直接影响WNK3的结构和功能.
  • 从二聚体到单聚体的结构过渡是WNK3.3感应压力的关键机制.
  • 这些发现表明WNK激酶对物理环境线索作出反应的新途径,补充了它们在透感应中的作用.