Starvation induces rapid degradation of selective autophagy receptors by endosomal microautophagy.
Starvation induces rapid degradation of selective autophagy receptors by endosomal microautophagy.
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DOI:
10.1083/jcb.201711002
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发表时间:
2018-10-01
期刊:
影响因子:
--
通讯作者:
Johansen T
中科院分区:
文献类型:
--
作者:
Mejlvang J;Olsvik H;Svenning S;Bruun JA;Abudu YP;Larsen KB;Brech A;Hansen TE;Brenne H;Hansen T;Stenmark H;Johansen T
Mejlvang et al. show that amino acid starvation of human fibroblasts and a lung cancer cell line induces a rapid and selective degradation of a subset of proteins, including autophagy receptors p62/SQSTM1, NBR1, TAX1BP1, NDP52, and NCOA4, that is independent from mTOR and canonical macroautophagy but dependent on endosomal microautophagy. It is not clear to what extent starvation-induced autophagy affects the proteome on a global scale and whether it is selective. In this study, we report based on quantitative proteomics that cells during the first 4 h of acute starvation elicit lysosomal degradation of up to 2–3% of the proteome. The most significant changes are caused by an immediate autophagic response elicited by shortage of amino acids but executed independently of mechanistic target of rapamycin and macroautophagy. Intriguingly, the autophagy receptors p62/SQSTM1, NBR1, TAX1BP1, NDP52, and NCOA4 are among the most efficiently degraded substrates. Already 1 h after induction of starvation, they are rapidly degraded by a process that selectively delivers autophagy receptors to vesicles inside late endosomes/multivesicular bodies depending on the endosomal sorting complex required for transport III (ESCRT-III). Our data support a model in which amino acid deprivation elicits endocytosis of specific membrane receptors, induction of macroautophagy, and rapid degradation of autophagy receptors by endosomal microautophagy.
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