The membrane-actin linker ezrin acts as a sliding anchor.

The membrane-actin linker ezrin acts as a sliding anchor.
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DOI:
10.1126/sciadv.abo2779
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发表时间:
2022-08-05
期刊:
影响因子:
13.6
通讯作者:
Dunn, Alexander R.
Dunn, Alexander R.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Korkmazhan, Elgin;Dunn, Alexander R.

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蛋白质与丝状(F)-肌动蛋白的连接为细胞膜提供机械稳定性并支持复杂的膜结构。然而,肌动蛋白细胞骨架是高度动态的,并且在细胞运动和其他过程中经历形状的快速变化。在膜和肌动蛋白细胞骨架之间产生机械坚固但流体连接的分子机制仍然知之甚少。在这里,我们采用了单分子光阱分析,以研究如何典型的膜肌动蛋白连接埃兹蛋白的行为,锚F-肌动蛋白的细胞膜。我们发现,ezrin形成一个复杂的幻灯片沿着F-肌动蛋白在微米的距离,而抵抗分离力取向垂直于丝轴。埃兹蛋白和类似蛋白的普遍存在表明,滑动锚,如埃兹蛋白可能构成一个重要的,但被忽视的因素,在建设的肌动蛋白细胞骨架。埃兹蛋白沿着肌动蛋白丝滑动,以在细胞膜和肌动蛋白细胞骨架之间提供动态和稳固的连接。
Protein linkages to filamentous (F)–actin provide the cell membrane with mechanical stability and support intricate membrane architectures. However, the actin cytoskeleton is highly dynamic and undergoes rapid changes in shape during cell motility and other processes. The molecular mechanisms that generate a mechanically robust yet fluid connection between the membrane and actin cytoskeleton remain poorly understood. Here, we adapted a single-molecule optical trap assay to examine how the prototypical membrane-actin linker ezrin acts to anchor F-actin to the cell membrane. We find that ezrin forms a complex that slides along F-actin over micrometer distances while resisting detachment by forces oriented perpendicular to the filament axis. The ubiquity of ezrin and analogous proteins suggests that sliding anchors such as ezrin may constitute an important but overlooked element in the construction of the actin cytoskeleton. Ezrin slides along actin filaments to provide a dynamic and robust linkage between the cell membrane and actin cytoskeleton.
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