Impact of cordon-bleu expression on actin cytoskeleton architecture and dynamics.

Impact of cordon-bleu expression on actin cytoskeleton architecture and dynamics.
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DOI:
10.1002/cm.21317
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发表时间:
2016-11
期刊:
影响因子:
2.9
通讯作者:
Tyska, Matthew J.
Tyska, Matthew J.
中科院分区:
生物学4区
文献类型:
--
作者:
Grega-Larson, Nathan E.;Crawley, Scott W.;Tyska, Matthew J.

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Cordon-bleu(COBL)是一种多功能的WASP同源2(WH 2)结构域蛋白,其涉及多种细胞功能,从神经元中的树突分支到运输上皮细胞表面上的微绒毛的组装。体外生物化学研究表明,COBL能够成核和切断肌动蛋白丝,以及其他活动。在体外观察到的COBL的多种活性如何有助于其在细胞中的功能仍不清楚。在这里,我们使用实时成像来评估COBL表达对培养细胞中肌动蛋白细胞骨架的影响。我们发现,COBL诱导整个细胞质中动态线性肌动蛋白结构的形成。我们还发现,用平行肌动蛋白捆绑蛋白espin稳定这些动态结构会减缓它们的周转,并使背侧细胞表面上自我支持的突起形成稳固。超分辨率成像显示,在表达这两种因子的细胞中,肌动蛋白细胞骨架发生了全面重塑。总之,这些结果提供了深入了解COBL如何有助于肌动蛋白为基础的结构,如上皮微绒毛的组装。
Cordon-bleu (COBL) is a multifunctional WASP-Homology 2 (WH2) domain-containing protein implicated in a wide variety of cellular functions ranging from dendritic arborization in neurons to the assembly of microvilli on the surface of transporting epithelial cells. In vitro biochemical studies suggest that COBL is capable of nucleating and severing actin filaments, among other activities. How the multiple activities of COBL observed in vitro contribute to its function in cells remains unclear. Here, we used live imaging to evaluate the impact of COBL expression on the actin cytoskeleton in cultured cells. We found that COBL induces the formation of dynamic linear actin structures throughout the cytosol. We also found that stabilizing these dynamic structures with the parallel actin bundling protein espin slows down their turnover and enables the robust formation of self-supported protrusions on the dorsal cell surface. Super-resolution imaging revealed a global remodeling of the actin cytoskeleton in cells expressing these two factors. Taken together, these results provide insight as to how COBL contributes to the assembly of actin-based structures such as epithelial microvilli.
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