Tensin3 interaction with talin drives the formation of fibronectin-associated fibrillar adhesions.

Tensin3 interaction with talin drives the formation of fibronectin-associated fibrillar adhesions.
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Tensin3与塔林的相互作用驱动了与纤连蛋白相关的原纤维粘附的形成。

DOI:
10.1083/jcb.202107022
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发表时间:
2022-10-03
期刊:
The Journal of cell biology
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Atherton和Konstantinou等人揭示了整合素相关蛋白tensin 3和talin之间相互作用的分子机制。通过与细胞内产生力的肌动球蛋白机制相关联,这种talin-tensin 3相互作用驱动纤维粘连和相关纤连蛋白纤维的形成,作为细胞外基质重塑的一部分。健康组织的形成涉及细胞外基质(ECM)的持续重塑。虽然已知这需要整合素相关的细胞-ECM粘附位点(CMA)和肌动球蛋白介导的力,但其潜在机制仍不清楚。在这里,我们研究如何tensin 3有助于形成纤维粘连(FB)和纤连蛋白原纤维。使用BioID质谱和线粒体靶向测定,我们建立了tensin 3与机械传感器,如talin和黏着斑蛋白。我们发现,塔林R11杆结构域直接结合到一个螺旋基序内的中央固有无序区(IDR)的tensin 3,而黏着斑蛋白通过塔林间接结合到tensin 3。使用CRISPR敲除细胞与定义的tensin 3突变的组合,我们表明(i)tensin 3对于α5β1-整合素FB的形成和纤连蛋白原纤维形成至关重要,以及(ii)talin/tensin 3相互作用驱动这一过程,黏着斑蛋白起着增强作用。
Atherton and Konstantinou et al. reveal the molecular mechanisms underpinning an interaction between the integrin-associated proteins tensin3 and talin. By associating with the intracellular force-generating actomyosin machinery, this talin–tensin3 interaction drives the formation of fibrillar adhesions and associated fibronectin fibrils as part of the extracellular matrix remodeling. The formation of healthy tissue involves continuous remodeling of the extracellular matrix (ECM). Whilst it is known that this requires integrin-associated cell-ECM adhesion sites (CMAs) and actomyosin-mediated forces, the underlying mechanisms remain unclear. Here, we examine how tensin3 contributes to the formation of fibrillar adhesions (FBs) and fibronectin fibrillogenesis. Using BioID mass spectrometry and a mitochondrial targeting assay, we establish that tensin3 associates with the mechanosensors such as talin and vinculin. We show that the talin R11 rod domain binds directly to a helical motif within the central intrinsically disordered region (IDR) of tensin3, whilst vinculin binds indirectly to tensin3 via talin. Using CRISPR knock-out cells in combination with defined tensin3 mutations, we show (i) that tensin3 is critical for the formation of α5β1-integrin FBs and for fibronectin fibrillogenesis, and (ii) the talin/tensin3 interaction drives this process, with vinculin acting to potentiate it.
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