作用于actomyosin的力量触发了desmoplakin在desmosomes中的形状变化
Yinchen Dong1, Ahmed Elgerbi2, Bin Xie3
1Department of Biomedical Engineering, University of California, Davis, CA, USA.
Nature communications
|October 10, 2025
概括
德斯莫索姆通过关键蛋白质德斯莫普拉金感知机械力. 作用于actomyosin的力量改变了desmoplakin的作用.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 结构生物学是结构生物学.
背景情况:
- 德斯莫索姆对于皮肤和心脏等组织的机械应力抵抗至关重要.
- 索体功能障碍与皮肤疾病,心肌病和癌症有关.
- 德斯莫索姆感知和响应机械力的机制尚不清楚.
研究的目的:
- 为了研究desmosomes如何感知和响应机械刺激.
- 为了阐明actomyosin力量在desmosome机制中的作用.
- 要确定德斯莫普拉金是否具有机械敏感性.
主要方法:
- 在上皮细胞和心肌细胞中进行超分辨率成像.
- 基于共振能量转移 (FRET) 的压力传感器.
- 原子计算机模拟和生物化学测试.
主要成果:
- 作用于actomyosin的力量诱导了desmoplakin的结构变化,这是一个关键的desmosomal蛋白质.
- 氨酸-19将F-actin与MCF7细胞中的脱体结合在一起,调节力集成.
- 阿克托米奥辛的收缩性重定向了质纤维,将力量引导到德斯莫普拉金,可能扩展其N端的斑块蛋白域.
- 德斯莫普拉金在心肌细胞中表现出类似的依赖力量的形状变化,受肌纤维细胞方向的影响.
结论:
- 德斯莫普拉金是机械敏感的,其结构状态反映了传递的力量.
- 氨酸网络介导了从actomyosin细胞骨到desmosomes的力传输.
- 这些发现提供了对不同细胞类型的desmosome机械生物学的见解.
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