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Journal Article

The endolysosomal adaptor PLEKHM1 is a direct target for both mTOR and MAPK pathways

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Dikic,  Ivan       
Max Planck Fellow Group ER remodelling Group, Prof. Ivan Đikić, Max Planck Institute of Biophysics, Max Planck Society;
Institute of Biochemistry II, Faculty of Medicine, Goethe University Frankfurt, Frankfkurt, Germany;
Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt, Frankfurt, Germany;

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Citation

Gubas, A., Karantanou, C., Popovic, D., Tascher, G., Hoffmann, M. E., Platzek, A., et al. (2021). The endolysosomal adaptor PLEKHM1 is a direct target for both mTOR and MAPK pathways. FEBS Letters, 595(7), 864-880. doi:10.1002/1873-3468.14041.


Cite as: https://hdl.handle.net/21.11116/0000-0007-B2C2-4
Abstract
The lysosome is a cellular signalling hub at the point of convergence of endocytic and autophagic pathways, where the contents are degraded and recycled. Pleckstrin homology domain-containing family member 1 (PLEKHM1) acts as an adaptor to facilitate the fusion of endocytic and autophagic vesicles with the lysosome. However, it is unclear how PLEKHM1 function at the lysosome is controlled. Herein, we show that PLEKHM1 co-precipitates with, and is directly phosphorylated by, mTOR. Using a phospho-specific antibody against Ser432/S435 of PLEKHM1, we show that the same motif is a direct target for ERK2-mediated phosphorylation in a growth factor-dependent manner. This dual regulation of PLEKHM1 at a highly conserved region points to a convergence of both growth factor- and amino acid-sensing pathways, placing PLEKHM1 at a critical juncture of cellular metabolism.