Reconstitution of COPII vesicle fusion to generate a pre-Golgi intermediate compartment.

Reconstitution of COPII vesicle fusion to generate a pre-Golgi intermediate compartment.
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复菌囊泡融合的重建以产生高尔基前中间室。

DOI:
10.1083/jcb.200408135
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发表时间:
2004-12-20
影响因子:
7.8
通讯作者:
Hay, JC
Hay, JC
中科院分区:
生物学1区
文献类型:
--
作者:
Xu, DL;Hay, JC

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分泌途径中膜融合的第一步是什么?在哺乳动物中,包裹有被毛复合体(COP) II的运输囊泡将分泌货物运送到囊泡管簇(VTCs),后者将货物从内质网出口转运到高尔基堆。然而,VTCs的确切起源和所涉及的膜融合步骤在实验上仍然难以解决。在这里,我们记录了内质网衍生的COPII运输囊泡形成更大的货物容器的体外直接系结和snare依赖融合。组装不需要可检测的高尔基膜,预先存在的VTCs或COPI功能。因此,COPII囊泡似乎包含通过同型融合启动VTC生物发生的所有机制。然而,COPI功能增强了VTC的组装,早期VTC通过与高尔基衍生COPI囊泡的异型融合获得了特定的高尔基成分。
What is the first membrane fusion step in the secretory pathway? In mammals, transport vesicles coated with coat complex (COP) II deliver secretory cargo to vesicular tubular clusters (VTCs) that ferry cargo from endoplasmic reticulum exit sites to the Golgi stack. However, the precise origin of VTCs and the membrane fusion step(s) involved have remained experimentally intractable. Here, we document in vitro direct tethering and SNARE-dependent fusion of endoplasmic reticulum–derived COPII transport vesicles to form larger cargo containers. The assembly did not require detectable Golgi membranes, preexisting VTCs, or COPI function. Therefore, COPII vesicles appear to contain all of the machinery to initiate VTC biogenesis via homotypic fusion. However, COPI function enhanced VTC assembly, and early VTCs acquired specific Golgi components by heterotypic fusion with Golgi-derived COPI vesicles.
DOI: 10.1016/s0092-8674(00)80379-7
发表时间: 1997-09-19
期刊: CELL
影响因子: 64.5
作者:
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