USP19 promotes hypoxia-induced mitochondrial division via FUNDC1 at ER-mitochondria contact sites.

The ER tethers tightly to mitochondria and the mitochondrial protein FUNDC1 recruits Drp1 to ER-mitochondria contact sites, subsequently facilitating mitochondrial fission and preventing mitochondria from undergoing hypoxic stress. However, the mechanisms by which the ER modulates hypoxia-induced mitochondrial fission are poorly understood. Here, we show that USP19, an ER-resident deubiquitinase, ...
accumulates at ER-mitochondria contact sites under hypoxia and promotes hypoxia-induced mitochondrial division. In response to hypoxia, USP19 binds to and deubiquitinates FUNDC1 at ER-mitochondria contact sites, which facilitates Drp1 oligomerization and Drp1 GTP-binding and hydrolysis activities, thereby promoting mitochondrial division. Our findings reveal a unique hypoxia response pathway mediated by an ER protein that regulates mitochondrial dynamics.
Mesh Terms:
Dynamins, Endopeptidases, Endoplasmic Reticulum, Humans, Hypoxia, Membrane Proteins, Mitochondria, Mitochondrial Dynamics, Mitochondrial Proteins, Mitophagy, Phosphorylation, Signal Transduction
J Cell Biol
Date: Dec. 05, 2020
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