How cells recognize and remove the perforated lysosome

Macroautophagy (hereafter autophagy) is a highly conserved intracellular degradation system to maintain cellular homeostasis by degrading cellular components such as misfolded proteins, nonfunctional organelles, pathogens, and cytosol. Conversely, selective autophagy targets and degrades specific ca...

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Bibliographic Details
Published in:Autophagy 2023-06, Vol.19 (6), p.1869-1871
Main Authors: Tabata, Keisuke, Saeki, Marika, Yoshimori, Tamotsu, Hamasaki, Maho
Format: Article
Language:English
Subjects:
Autophagic Punctum
CUL4A
LAMP2
lysophagy
lysosomal membrane damage
selective autophagy
ubiquitination
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Summary:Macroautophagy (hereafter autophagy) is a highly conserved intracellular degradation system to maintain cellular homeostasis by degrading cellular components such as misfolded proteins, nonfunctional organelles, pathogens, and cytosol. Conversely, selective autophagy targets and degrades specific cargo, such as organelles, bacteria, etc. We previously reported that damaged lysosomes are autophagy targets, via a process called lysophagy. However, how cells target damaged lysosomes through autophagy is not known. We performed proteomics analysis followed by siRNA screening to identify genes involved in targeting damaged lysosomes and identified a new E3 ligase complex, involving CUL4A (cullin 4A), as a regulatory complex in lysophagy. We also found that this complex mediates K48-linked poly-ubiquitination on lysosome protein LAMP2 during lysosomal damage; particularly, the lumenal side of LAMP2 is important to recruit the complex to damaged lysosomes. This protein modification is thus critical to initiate the clearance of damaged lysosomes.
ISSN:1554-8627
1554-8635
DOI:10.1080/15548627.2022.2138686