Functional reconstitution of ESCRT-III assembly and disassembly.

Functional reconstitution of ESCRT-III assembly and disassembly.
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DOI:
10.1016/j.cell.2008.11.013
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发表时间:
2009-01-09
期刊:
影响因子:
64.5
通讯作者:
Emr SD
Emr SD
中科院分区:
生物学1区
文献类型:
--
作者:
Saksena S;Wahlman J;Teis D;Johnson AE;Emr SD

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MVB途径中的受体下调由ESCRT复合物介导。ESCRT-III由四个蛋白质亚基组成,它们在胞质溶胶中是单体,仅在膜结合时寡聚成蛋白质晶格。最近的研究表明,ESCRT-III蛋白Snf 7可以通过同源寡聚化形成细丝。为了研究膜结合和与其它ESCRT组分的相互作用在引发Snf 7寡聚化中的作用,我们使用荧光光谱法直接检测和表征使用纯化的ESCRT组分的Snf 7寡聚体在脂质体上的组装。观察到的荧光变化揭示了一个强制性的序列的膜蛋白质和蛋白质-蛋白质的相互作用,产生的活性构象的Snf 7。此外,我们证明,ESCRT-III组件驱动膜变形。此外,使用体外拆卸试验,我们直接证明,Vps 24和Vps 2的功能作为适配器的ATP依赖性膜拆卸的ESCRT-III复合物通过招募AAA ATP酶Vps 4。
Receptor down-regulation in the MVB pathway is mediated by the ESCRT complexes. ESCRT-III is composed of four protein subunits that are monomeric in the cytosol and oligomerize into a protein lattice only upon membrane binding. Recent studies have shown that the ESCRT-III protein Snf7 can form a filament by undergoing homo-oligomerization. To examine the role of membrane binding and of interactions with other ESCRT components in initiating Snf7 oligomerization, we used fluorescence spectroscopy to directly detect and characterize the assembly of the Snf7 oligomer on liposomes using purified ESCRT components. The observed fluorescence changes reveal an obligatory sequence of membrane-protein and protein-protein interactions that generate the active conformation of Snf7. Also, we demonstrate that ESCRT-III assembly drives membrane deformation. Furthermore, using an in vitro disassembly assay, we directly demonstrate that Vps24 and Vps2 function as adaptors in the ATP-dependent membrane disassembly of the ESCRT-III complex by recruiting the AAA ATPase Vps4.
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