The RAB GTPase RAB18 modulates macroautophagy and proteostasis.

Macroautophagy is a conserved degradative pathway and its deterioration is linked to disturbances in cellular proteostasis and multiple diseases. Here, we show that the RAB GTPase RAB18 modulates autophagy in primary human fibroblasts. The knockdown of RAB18 results in a decreased autophagic activity, while its overexpression enhances the degradative pathway. Importantly, this function of RAB18 is dependent on RAB3GAP1 and RAB3GAP2, which might act as RAB GEFs and stimulate the activity of the RAB GTPase. Moreover, the knockdown of RAB18 deteriorates proteostasis and results in the intracellular accumulation of ubiquitinated degradation-prone proteins. Thus, the RAB GTPase RAB18 is a positive modulator of autophagy and is relevant for the maintenance of cellular proteostasis. Copyright © 2017 The Authors. Published by Elsevier Inc. All rights reserved.

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Anne Feldmann, Fazilet Bekbulat, Heike Huesmann, Sarah Ulbrich, Jörg Tatzelt, Christian Behl, Andreas Kern. The RAB GTPase RAB18 modulates macroautophagy and proteostasis. Biochemical and biophysical research communications. 2017 May 06;486(3):738-743

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PMID: 28342870

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