The ghost in the machine: small GTPases as spatial regulators of exocytosis.

The ghost in the machine: small GTPases as spatial regulators of exocytosis.
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DOI:
10.1016/j.tcb.2008.06.007
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发表时间:
2008-09
影响因子:
19
通讯作者:
Brennwald P
Brennwald P
中科院分区:
生物学1区
文献类型:
--
作者:
Wu H;Rossi G;Brennwald P

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膜转运事件的时间和空间调节对膜的身份和整体细胞极性都至关重要。Rab, Ral和Rho蛋白家族的小gtp酶被认为是囊泡对接和融合事件的重要调节因子。这篇综述的重点是这些gtpase如何与胞囊复合物相互作用,胞囊复合物是一种多亚基系链复合物,参与细胞表面运输和细胞极性的调节。Rab和Ral GTPases被认为在囊泡组装和囊泡系聚过程中起作用,而Rho家族GTPases似乎在囊泡复合物的局部激活中起作用,以促进下游的囊泡融合事件。Rho GTPases对胞囊的局部激活可能在胞吐的空间调节中起重要作用。
Temporal and spatial regulation of membrane-trafficking events is crucial to both membrane identity and overall cell polarity. Small GTPases of the Rab, Ral and Rho protein families have been implicated as important regulators of vesicle docking and fusion events. This review focuses on how these GTPases interact with the exocyst complex, which is a multi-subunit tethering complex involved in the regulation of cell-surface transport and cell polarity. The Rab and Ral GTPases are thought to function in exocyst assembly and vesicle-tethering processes, whereas the Rho family GTPases seem to function in the local activation of the exocyst complex to facilitate downstream vesicle-fusion events. The localized activation of the exocyst by Rho GTPases is likely to have an important role in spatial regulation of exocytosis.
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