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Autophagy allows the degradation of cytosolic endogenous and exogenous material in the lysosome. Substrates are engulfed by double-membrane vesicles, coined autophagosomes, which subsequently fuse with lysosomes. Depending on the involvement of specific receptor proteins, autophagy occurs in a selective or nonselective manner. While this process is well understood at the level of bulky cargo such as mitochondria and bacteria, we know very little about individual proteins and protein complexes that are engulfed and degraded by autophagy. In contrast to the critical role of autophagy in balancing proteostasis, our current knowledge of the autophagic degradome is very limited. Here, we combined proximity labeling with quantitative proteomics to systematically map the protein inventory of autophagosomes. Using this strategy, we uncovered a basal, housekeeping mitophagy pathway that involves piecemeal degradation of mitochondrial proteins in a LC3C- and p62-dependent manner and contributes to mitochondrial homeostasis maintenance when cells rely on oxidative phosphorylation.
Pubmed ID: 29149599 RIS Download
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