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- W1531760003 abstract "The endosomal system and autophagy are 2 intertwined pathways that share a number of common protein factors as well as a final destination, the lysosome. Identification of adaptor platforms that can link both pathways are of particular importance, as they serve as common nodes that can coordinate the different trafficking arms of the endolysosomal system. Using a mass spectrometry approach to identify interaction partners of active (GTP-bound) RAB7, the late endosome/lysosome GTPase, and yeast 2-hybrid screening to identify LC3/GABARAP interaction partners we discovered the multivalent adaptor protein PLEKHM1. We discovered a highly conserved LC3-interaction region (LIR) between 2 PH domains of PLEKHM1 that mediated direct binding to all LC3/GABARAP family members. Subsequent mass spectrometry analysis of PLEKHM1 precipitated from cells revealed the HOPS (homotypic fusion and protein sorting) complex as a prominent interaction partner. Functionally, depletion of PLEKHM1, HOPS, or RAB7 results in decreased autophagosome-lysosome fusion. In Plekhm1 knockout (KO) mouse embryonic fibroblasts (MEFs) we observed increased lipidated LC3B, decreased colocalization between LC3B and LAMP1 under amino acid starvation conditions and decreased autolysosome formation. Finally, PLEKHM1 binding to LC3-positive autophagosomes was also essential for selective autophagy pathways, as shown by clearance of puromycin-aggregates, in a PLEKHM1-LIR-dependent manner. Overall, we have identified PLEKHM1 as an endolysosomal adaptor platform that acts as a central hub to integrate endocytic and autophagic pathways at the lysosome." @default.
- W1531760003 created "2016-06-24" @default.
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- W1531760003 date "2015-04-03" @default.
- W1531760003 modified "2023-10-10" @default.
- W1531760003 title "PLEKHM1: Adapting to life at the lysosome" @default.
- W1531760003 doi "https://doi.org/10.1080/15548627.2015.1034419" @default.
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