Robust polarity establishment occurs via an endocytosis-based cortical corralling mechanism.

Robust polarity establishment occurs via an endocytosis-based cortical corralling mechanism.
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DOI:
10.1083/jcb.201206081
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发表时间:
2013-02-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
McCusker D
McCusker D
中科院分区:
其他
文献类型:
--
作者:
Jose M;Tollis S;Nair D;Sibarita JB;McCusker D

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细胞的极性可以通过内吞作用和胞吞作用相反的膜转运活动的空间协调来确定。一个稳定的极轴的形成是许多生物过程的基础。在这里,使用高分辨率成像和互补的数学模型,我们发现细胞的极性可以通过相反的膜运输活动:内吞和胞吐的空间协调来确定。在发芽酵母的极性建立过程中,这些拮抗过程变得相反。内吞小泡围住中央的胞外区,将其收紧到一个顶点,该顶点为随后的细胞周期建立了极轴。同时,内吞系统达到平衡,内化事件以恒定的频率发生。未能在畜栏内启动周期性内化事件的内吞突变体显示出宽的、不稳定的极轴。这些结果,由计算机模拟预测,并得到高分辨率体内研究的验证,确定了在强健的极性建立过程中对胞内围栏的要求。
Cell polarity can be established via the spatial coordination of the opposing membrane trafficking activities of endocytosis and exocytosis. Formation of a stable polarity axis underlies numerous biological processes. Here, using high-resolution imaging and complementary mathematical modeling we find that cell polarity can be established via the spatial coordination of opposing membrane trafficking activities: endocytosis and exocytosis. During polarity establishment in budding yeast, these antagonistic processes become apposed. Endocytic vesicles corral a central exocytic zone, tightening it to a vertex that establishes the polarity axis for the ensuing cell cycle. Concomitantly, the endocytic system reaches an equilibrium where internalization events occur at a constant frequency. Endocytic mutants that failed to initiate periodic internalization events within the corral displayed wide, unstable polarity axes. These results, predicted by in silico modeling and verified by high resolution in vivo studies, identify a requirement for endocytic corralling during robust polarity establishment.
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