Architecture and dynamic remodelling of the septin cytoskeleton during the cell cycle.

Architecture and dynamic remodelling of the septin cytoskeleton during the cell cycle.
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在细胞周期期间,septin细胞骨架的结构和动态重塑。

DOI:
10.1038/ncomms6698
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发表时间:
2014-12-05
影响因子:
16.6
通讯作者:
Bi E
Bi E
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ong K;Wloka C;Okada S;Svitkina T;Bi E

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间隔蛋白通过形成细丝和更高级的结构发挥不同的功能。然而,Septin结构的确切结构仍不清楚。在萌芽酵母中,在胞质分裂前,间隔蛋白在母芽颈处形成“沙漏”,在胞质分裂过程中转化为“双环”。在这里,使用铂复制电子显微镜,我们发现早期沙漏由沿母芽轴取向的SEPTIN双丝组成。在沙漏晚期,这些双丝在膜的近端由周期性的环状单丝连接,并且在膜的远侧与位于中心的周向的肌球蛋白II粗丝相连。双环完全由环状隔质细丝组成。活细胞成像研究表明,沙漏从沙漏到双环的转变伴随着沙漏中的Septin亚基的丢失,以及剩余的亚基重组成双环。这项工作提供了细胞内隔素结构的无与伦比的视角,并定义了它们在细胞周期中的重塑动力学。
Septins perform diverse functions through the formation of filaments and higher-order structures. However, the exact architecture of septin structures remains unclear. In the budding yeast Saccharomyces cerevisiae, septins form an “hourglass” at the mother-bud neck before cytokinesis, which is converted into a “double ring” during cytokinesis. Here, using platinum-replica electron microscopy, we find that the early hourglass consists of septin double filaments oriented along the mother-bud axis. In the late hourglass, these double filaments are connected by periodic circumferential single filaments on the membrane-proximal side, and are associated with centrally located, circumferential, myosin-II thick filaments on the membrane-distal side. The double ring consists of exclusively circumferential septin filaments. Live-cell imaging studies indicate that the hourglass-to-double ring transition is accompanied by loss of septin subunits from the hourglass, and reorganization of the remaining subunits into the double ring. This work provides an unparalleled view of septin structures within cells and defines their remodeling dynamics during the cell cycle.
DOI: 10.1083/jcb.201012143
发表时间: 2011-06-13
期刊: The Journal of cell biology
影响因子: --
作者:
DeMay BS;Bai X;Howard L;Occhipinti P;Meseroll RA;Spiliotis ET;Oldenbourg R;Gladfelter AS
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