Contact of cis-Golgi with ER exit sites executes cargo capture and delivery from the ER.

Contact of cis-Golgi with ER exit sites executes cargo capture and delivery from the ER.
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DOI:
10.1038/ncomms4653
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发表时间:
2014-04-14
影响因子:
16.6
通讯作者:
Nakano, Akihiko
Nakano, Akihiko
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kurokawa, Kazuo;Okamoto, Michiyo;Nakano, Akihiko

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蛋白质从内质网(ER)转运到高尔基体是由外壳复合物II(COPII)囊泡介导的。据信,含有货物的COPII囊泡从ER出口位点(ERES)释放到胞质溶胶中,然后到达并与第一ER后隔室、顺式高尔基体或ER至高尔基体中间隔室(ERGIC)融合。然而,它仍然是难以捉摸的货物装载到囊泡,囊泡出芽,拴系和融合如何在体内协调。在这里,我们表明,使用极高的速度和高分辨率的共聚焦显微镜,在芽殖酵母酿酒酵母的方法和接触的ERES的顺式高尔基体。然后COPII外套笼崩溃,顺式高尔基体捕获货物。顺式高尔基体,这样装载货物,然后离开ERES。我们建议,这种'拥抱和亲吻'行为的顺式高尔基体,确保有效和有针对性的货物运输从ERES顺式高尔基体。 从内质网(ER)到高尔基体的蛋白质运输是由COPII包被的囊泡介导的,这些囊泡从ER出口位点出芽并与顺式高尔基体融合。Kurokawa等人表明,在芽殖酵母中,顺式高尔基体以“拥抱和亲吻”机制到达ER出口位点以促进货物转移。
Protein transport from the endoplasmic reticulum (ER) to the Golgi apparatus is mediated by coat complex II (COPII) vesicles. It has been believed that COPII vesicles containing cargo are released from the ER exit sites (ERES) into the cytosol and then reach and fuse with the first post-ER compartment, cis-Golgi or ER-to-Golgi intermediate compartment (ERGIC). However, it still remains elusive how cargo loading to vesicles, vesicle budding, tethering and fusion are coordinated in vivo. Here we show, using extremely high speed and high resolution confocal microscopy, that the cis-Golgi in the budding yeast Saccharomyces cerevisiae approaches and contacts the ERES. The COPII coat cage then collapses and the cis-Golgi captures cargo. The cis-Golgi, thus loaded with cargo, then leaves the ERES. We propose that this ‘hug-and-kiss’ behaviour of cis-Golgi ensures efficient and targeted cargo transport from the ERES to cis-Golgi. Protein traffic from the endoplasmic reticulum (ER) to the Golgi is mediated by COPII-coated vesicles that bud from ER exit sites and fuse with the cis-Golgi. Kurokawa et al. show that in budding yeast, the cis-Golgi reaches out to ER exit sites in a ‘hug-and-kiss’ mechanism to facilitate cargo transfer.
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