LET-413/Erbin acts as a RAB-5 effector to promote RAB-10 activation during endocytic recycling.

LET-413/Erbin acts as a RAB-5 effector to promote RAB-10 activation during endocytic recycling.
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LET-413/Erbin 充当 RAB-5 效应子,在内吞循环过程中促进 RAB-10 激活。

DOI:
10.1083/jcb.201705136
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发表时间:
2018-01-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Shi A
Shi A
中科院分区:
其他
文献类型:
--
作者:
Liu H;Wang S;Hang W;Gao J;Zhang W;Cheng Z;Yang C;He J;Zhou J;Chen J;Shi A

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RAB-10是极化上皮细胞内吞再循环的主要调节因子。Liu等鉴定了LET-413,即Scrib/Erbin的秀丽隐杆线虫同源物,作为RAB-5效应物,其是DENN-4介导的RAB-10活化和控制C.线虫肠RAB-10/Rab 10是上皮细胞内吞再循环的主要调节因子。为了更好地理解RAB-10活性的调节,我们试图鉴定RAB-10(GDP)相互作用蛋白。我们鉴定的一种新的RAB-10(GDP)结合伴侣LET-413是Scrib/Erbin的秀丽隐杆线虫同源物。在此,我们重点研究了LET-413在C.线虫肠我们表明LET-413是RAB-5效应子,并与RAB-10共定位在核内体上,并且LET-413与RAB-10的重叠是RAB-5依赖性的。值得注意的是,LET-413增强DENN-4与RAB-10(GDP)的相互作用,并促进DENN-4鸟嘌呤核苷酸交换因子对RAB-10的活性。LET-413的损失导致RAB-10效应物TBC-2和CNT-1的胞质分散。最后,我们证明了RAB-10或LET-413的缺失导致侧膜异常过度伸展。因此,我们的研究表明,LET-413是DENN-4介导的RAB-10激活所必需的,并且LET-413辅助的RAB-5到RAB-10级联有助于C.肠上皮细胞
RAB-10 is a master regulator of endocytic recycling in polarized epithelial cells. Liu et al. identify LET-413, the Caenorhabditis elegans homolog of Scrib/Erbin, as a RAB-5 effector that is required for the DENN-4–mediated activation of RAB-10 and the control of membrane expansion in the C. elegans intestine. RAB-10/Rab10 is a master regulator of endocytic recycling in epithelial cells. To better understand the regulation of RAB-10 activity, we sought to identify RAB-10(GDP)–interacting proteins. One novel RAB-10(GDP)–binding partner that we identified, LET-413, is the Caenorhabditis elegans homologue of Scrib/Erbin. Here, we focus on the mechanistic role of LET-413 in the regulation of RAB-10 within the C. elegans intestine. We show that LET-413 is a RAB-5 effector and colocalizes with RAB-10 on endosomes, and the overlap of LET-413 with RAB-10 is RAB-5 dependent. Notably, LET-413 enhances the interaction of DENN-4 with RAB-10(GDP) and promotes DENN-4 guanine nucleotide exchange factor activity toward RAB-10. Loss of LET-413 leads to cytosolic dispersion of the RAB-10 effectors TBC-2 and CNT-1. Finally, we demonstrate that the loss of RAB-10 or LET-413 results in abnormal overextensions of lateral membrane. Hence, our studies indicate that LET-413 is required for DENN-4–mediated RAB-10 activation, and the LET-413–assisted RAB-5 to RAB-10 cascade contributes to the integrity of C. elegans intestinal epithelia.
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