Vps34 and the Armus/TBC-2 Rab GAPs: Putting the Brakes on the Endosomal Rab5 and Rab7 GTPases

Overview

Journal Cell Logist

Date 2018 Jan 4

PMID 29296513

Citations 8

Authors

Fiona Law

Christian E Rocheleau

Affiliations

Soon will be listed here.

Abstract

Rab5 and Rab7 GTPases are key regulators of endosome maturation and lysosome fusion. They activate the class III phosphoinositide 3-kinase (PI3K) Vps34 to generate pools of phosphatidylinositol-3 phosphate [PI(3)P] on endosomes. Together PI(3)P and the GTP-bound Rabs coordinate the recruitment of endosomal regulators to drive early to late endosome maturation and ultimately lysosome fusion. Counterintuitively, loss of Vps34 results in enlarged endosomes, like those seen from expressing activated Rab GTPases. Two recent papers in the , Jaber , 2016 and Law, Seo ., 2017, demonstrate that a function of Vps34 is to inactive the Rab5 and Rab7 GTPases via recruitment of the TBC1D2 family of Rab GTPase Activating Proteins (GAPs).

Citing Articles

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