A Selective Autophagy Pathway for Phase-Separated Endocytic Protein Deposits.

A Selective Autophagy Pathway for Phase-Separated Endocytic Protein Deposits.
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DOI:
10.1016/j.molcel.2020.10.030
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发表时间:
2020-12-03
期刊:
影响因子:
16
通讯作者:
Baumeister W
Baumeister W
中科院分区:
生物学1区
文献类型:
--
作者:
Wilfling F;Lee CW;Erdmann PS;Zheng Y;Sherpa D;Jentsch S;Pfander B;Schulman BA;Baumeister W

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Autophagy eliminates cytoplasmic content selected by autophagy receptors, which link cargo to the membrane-bound autophagosomal ubiquitin-like protein Atg8/LC3. Here, we report a selective autophagy pathway for protein condensates formed by endocytic proteins in yeast. In this pathway, the endocytic protein Ede1 functions as a selective autophagy receptor. Distinct domains within Ede1 bind Atg8 and mediate phase separation into condensates. Both properties are necessary for an Ede1-dependent autophagy pathway for endocytic proteins, which differs from regular endocytosis and does not involve other known selective autophagy receptors but requires the core autophagy machinery. Cryo-electron tomography of Ede1-containing condensates, at the plasma membrane and in autophagic bodies, shows a phase-separated compartment at the beginning and end of the Ede1-mediated selective autophagy route. Our data suggest a model for autophagic degradation of macromolecular protein complexes by the action of intrinsic autophagy receptors. Ede1 is an intrinsic autophagy receptor for aberrant CME protein assemblies Aberrant CME assemblies form by liquid-liquid phase separation Liquid-liquid phase separation of Ede1 is important for autophagic degradation Ultrastructural view of an LLPS compartment at the PM and within autophagic bodies Removal of nonfunctional macromolecular complexes is important for cellular homeostasis. Wilfling et al. report a selective autophagy pathway for degradation of unproductive protein assemblies within the clathrin-mediated endocytosis machinery. The scaffold protein Ede1 hereby acts as a built-in quality control monitoring the assembly state of the clathrin-mediated endocytosis machinery.
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