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Plos Biology : the Rab5 Effector Rabankyrin-5 Regulates and Coordinates Different Endocytic Mechanisms, Volume 2

By Walter, Peter

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Book Id: WPLBN0003923085
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Biology : the Rab5 Effector Rabankyrin-5 Regulates and Coordinates Different Endocytic Mechanisms, Volume 2  
Author: Walter, Peter
Volume: Volume 2
Language: English
Subject: Journals, Science, Biology
Collections: Periodicals: Journal and Magazine Collection (Contemporary), PLoS Biology
Historic
Publication Date:
Publisher: Plos

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Walter, P. (n.d.). Plos Biology : the Rab5 Effector Rabankyrin-5 Regulates and Coordinates Different Endocytic Mechanisms, Volume 2. Retrieved from http://netlibrary.net/


Description
Description : The small GTPase Rab5 is a key regulator of clathrin-mediated endocytosis. On early endosomes, within a spatially restricted domain enriched in phosphatydilinositol-3-phosphate [PI(3)P], Rab5 coordinates a complex network of effectors that functionally cooperate in membrane tethering, fusion, and organelle motility. Here we discovered a novel PI(3)P-binding Rab5 effector, Rabankyrin-5, which localises to early endosomes and stimulates their fusion activity. In addition to early endosomes, however, Rabankyrin-5 localises to large vacuolar structures that correspond to macropinosomes in epithelial cells and fibroblasts. Overexpression of Rabankyrin-5 increases the number of macropinosomes and stimulates fluid-phase uptake, whereas its downregulation inhibits these processes. In polarised epithelial cells, this function is primarily restricted to the apical membrane. Rabankyrin-5 localises to large pinocytic structures underneath the apical surface of kidney proximal tubule cells, and its overexpression in polarised Madin- Darby canine kidney cells stimulates apical but not basolateral, non-clathrin-mediated pinocytosis. In demonstrating a regulatory role in endosome fusion and (macro)pinocytosis, our studies suggest that Rab5 regulates and coordinates different endocytic mechanisms through its effector Rabankyrin-5. Furthermore, its active role in apical pinocytosis in epithelial cells suggests an important function of Rabankyrin-5 in the physiology of polarised cells.

 

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