GCC185 plays independent roles in Golgi structure maintenance and AP-1-mediated vesicle tethering.

GCC185 plays independent roles in Golgi structure maintenance and AP-1-mediated vesicle tethering.
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GCC185 在高尔基体结构维持和 AP-1 介导的囊泡束缚中发挥独立作用。

DOI:
10.1083/jcb.201104019
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发表时间:
2011-09-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Pfeffer SR
Pfeffer SR
中科院分区:
其他
文献类型:
--
作者:
Brown FC;Schindelhaim CH;Pfeffer SR

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GCC 185的两个不同的结构域在维持高尔基体结构或结合AP-1以在通往高尔基体的途中拴系逆行运输囊泡中起作用。GCC 185是位于高尔基体反式网络(trans-Golgi network,TGN)的长卷曲螺旋蛋白,其功能是维持高尔基体结构并在通往高尔基体的途中束缚含甘露糖6-磷酸受体(MPR)的转运囊泡。我们报告的两个不同的域的GCC 185需要高尔基体结构的维护或运输囊泡拴系,证明这两个功能的独立性。囊泡拴系所需的结构域与网格蛋白衔接子AP-1结合,GCC 185耗尽的细胞在AP-1修饰的运输囊泡中积累MPR。这项研究支持了先前提出的作用AP-1的MPR从晚期内体到高尔基体的逆行运输,并表明对接可能涉及囊泡相关的AP-1蛋白与TGN相关的拴系蛋白GCC 185的相互作用。
Two distinct domains of GCC185 function in maintaining Golgi structure or in binding to AP-1 to tether retrograde transport vesicles en route to the Golgi. GCC185 is a long coiled-coil protein localized to the trans-Golgi network (TGN) that functions in maintaining Golgi structure and tethering mannose 6-phosphate receptor (MPR)–containing transport vesicles en route to the Golgi. We report the identification of two distinct domains of GCC185 needed either for Golgi structure maintenance or transport vesicle tethering, demonstrating the independence of these two functions. The domain needed for vesicle tethering binds to the clathrin adaptor AP-1, and cells depleted of GCC185 accumulate MPRs in transport vesicles that are AP-1 decorated. This study supports a previously proposed role of AP-1 in retrograde transport of MPRs from late endosomes to the Golgi and indicates that docking may involve the interaction of vesicle-associated AP-1 protein with the TGN-associated tethering protein GCC185.
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