该RhoGAP ARHGAP32与desmoplakin相互作用,并且需要进行desmosomal组织和组装
Hua Li1,2, Yinzhen He1,2, Yan Wang1,2
1Center for Life Sciences, Yunnan University, Kunming, Yunnan 650500, China.
Journal of cell science
|September 11, 2024
概括
激活Rho GTPase的蛋白质ARHGAP32通过与desmoplakin (DSP) 相互作用来调节desmosome组织. 这种相互作用对于控制actin细胞骨动力学和维持组织屏障完整性至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 组织工程是组织工程.
背景情况:
- 德斯莫索姆对组织屏障完整性至关重要,特别是在机械应激的组织中.
- 细胞骨调节了desmosome组装,desmosomes影响F-actin动力学,但这种交叉通话的确切机制是未知的.
研究的目的:
- 阐明了底层的机制desmosomes和F-actin细胞骨架之间的交叉通话.
- 为了识别参与调节脱素 - 乙相互作用的蛋白质.
主要方法:
- 免疫光显微镜可视化蛋白质定位.
- 同免疫沉以研究蛋白质相互作用.
- 编辑CRISPR/Cas9基因以产生淘汰细胞系 (ARHGAP32-KO).
- 西方涂抹以评估蛋白质酸化和活性.
主要成果:
- ARHGAP32通过与desmoplakin (DSP) 的相互作用定位到desmosomes.
- ARHGAP32对于代体组织,成熟和长度至关重要.
- 失去ARHGAP32会导致F-actin应激纤维增加和actomyosin收缩性.
- 抑制ROCK活动可以在ARHGAP32-KO细胞中挽救脱体组织.
- DSP损失会影响ARHGAP32的局部化,并降低了actomyosin的收缩性.
- 由于ARHGAP32缺乏其GAB2交互域 (GAB2-ID),因此无法挽救desmosome组织.
结论:
- 通过与DSP的直接相互作用,ARHGAP32调节了desmosomes.
- 这种相互作用介导了desmosomes和F-actin细胞骨架之间的交叉声调.
- ARHGAP32通过将德斯莫索姆与actomyosin调节联系起来,在维持上皮组织完整性方面发挥着关键作用.
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