Membrane scission by the ESCRT-III complex.

Membrane scission by the ESCRT-III complex.
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ESCRT-III复合物的膜分裂。

DOI:
10.1038/nature07836
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发表时间:
2009-03-12
期刊:
影响因子:
64.8
通讯作者:
Hurley, James H.
Hurley, James H.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wollert, Thomas;Wunder, Christian;Lippincott-Schwartz, Jennifer;Hurley, James H.

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ESCRT系统对于多泡体生物发生是必不可少的,其中货物分选与腔内囊泡的内陷和断裂偶联。ESCRT也是包膜病毒(包括HIV-1)出芽和胞质分裂中膜破裂所必需的。在酵母中,ESCRT-III由Vps 20、Snf 7、Vps 24和Vps 2组成,它们按顺序组装,并需要ATP酶Vps 4进行分解。ESCRT-III依赖的出芽和分裂的腔内囊泡成巨大的单层囊泡重建和可视化的荧光显微镜。ESCRT-III的三个亚基Vps 20、Snf 7和Vps 24足以分离腔内囊泡。负责募集Vps 4的ESCRT-III亚基Vps 2和Vps 4的ATP酶活性是ESCRT-III再循环所需的,并支持额外的出芽轮次。ESCRT-III和Vps 4蛋白能够多个循环的囊泡脱离的最小集合对应于从古细菌到动物保守的古老的ESCRT蛋白集合。
The ESCRT system is essential for multivesicular body biogenesis, in which cargo sorting is coupled to the invagination and scission of intralumenal vesicles. The ESCRTs are also needed for budding of enveloped viruses including HIV-1, and for membrane abscission in cytokinesis. In yeast, ESCRT-III consists of Vps20, Snf7, Vps24, and Vps2, which assemble in that order, and require the ATPase Vps4 for their disassembly. The ESCRT-III-dependent budding and scission of intralumenal vesicles into giant unilamellar vesicles was reconstituted and visualized by fluorescence microscopy. Three subunits of ESCRT-III, Vps20, Snf7, and Vps24, were sufficient to detach intralumenal vesicles. Vps2, the ESCRT-III subunit responsible for recruiting Vps4, and the ATPase activity of Vps4 were required for ESCRT-III recycling and supported additional rounds of budding. The minimum set of ESCRT-III and Vps4 proteins capable of multiple cycles of vesicle detachment corresponds to the ancient set of ESCRT proteins conserved from archaea to animals.
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