ER-to-Golgi trafficking of procollagen in the absence of large carriers

ER-to-Golgi trafficking of procollagen in the absence of large carriers
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在没有大载体的情况下,前胶原从内质网到高尔基体的运输

DOI:
10.1101/339804
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
McCaughey J
McCaughey J
中科院分区:
--
文献类型:
--
作者:
McCaughey J

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胶原蛋白的分泌和组装是细胞外基质功能的基础。胶原基质的组装缺陷会导致包括纤维化和成骨不全在内的病理改变。由于形成纤维的前胶原分子的大小,人们认为它们是通过专门的大型COPII依赖载体从内质网运输到高尔基体的。在这里,分析内源性前胶原和一种新的工程GFP标记形式,我们表明,运输到高尔基体发生在没有大的(>350 nm)载体的情况下。偶尔可以观察到大的GFP阳性结构,但这些结构是非动态的,不是COPII阳性的,并且标记有ER的标记。我们提出了一个COPII依赖的ER到高尔基体交通的短环模型,虽然该模型与COPII载体的ERGIC依赖的扩展模型一致,但并不引发大泡结构的长距离运输。我们的发现为前胶原蛋白的运输过程提供了一个重要的洞察力,并揭示了一条从内质网到高尔基体的短环路径,而不使用大型载体。
Secretion and assembly of collagen are fundamental to the function of the extracellular matrix. Defects in the assembly of a collagen matrix lead to pathologies including fibrosis and osteogenesis imperfecta. Owing to the size of fibril-forming procollagen molecules it is assumed that they are transported from the endoplasmic reticulum to the Golgi in specialized large COPII-dependent carriers. Here, analyzing endogenous procollagen and a new engineered GFP-tagged form, we show that transport to the Golgi occurs in the absence of large (>350 nm) carriers. Large GFP-positive structures were observed occasionally, but these were nondynamic, are not COPII positive, and are labeled with markers of the ER. We propose a short-loop model of COPII-dependent ER-to-Golgi traffic that, while consistent with models of ERGIC-dependent expansion of COPII carriers, does not invoke long-range trafficking of large vesicular structures. Our findings provide an important insight into the process of procollagen trafficking and reveal a short-loop pathway from the ER to the Golgi, without the use of large carriers.
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