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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Microautophagy regulates proteasome homeostasis.

Jianhui Li1, Mark Hochstrasser2,3

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA.

Current Genetics
|February 21, 2020
PubMed
Summary

Yeast cells use diverse pathways to manage proteasomes during starvation, including microautophagy and proteasome storage granules (PSGs). AMP-activated protein kinase (AMPK) and ESCRT factors regulate these processes for proteasome homeostasis.

Keywords:
AMPKESCRTMicroautophagyProteasomeProteasome storage granule (PSG)

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Proteasomes are crucial for protein degradation in cells.
  • Nutritional stress triggers various cellular responses to maintain proteasome homeostasis.
  • Yeast cells employ distinct mechanisms like autophagy and proteasome storage granules (PSGs) to manage proteasomes under stress.

Purpose of the Study:

  • To investigate the diverse mechanisms of proteasome regulation during nutritional stress in yeast.
  • To elucidate the roles of macroautophagy, microautophagy, and PSGs in proteasome quality and quantity control.
  • To identify key molecular players, such as AMPK and ESCRT factors, involved in these pathways.

Main Methods:

  • Yeast cell culture under various starvation conditions (nitrogen, carbon, glucose).
  • Microscopy to observe proteasome localization and PSG formation.
  • Genetic analysis involving knockouts of autophagy-related genes, AMPK, and ESCRT factors.
  • Biochemical assays to assess proteasome activity and integrity.

Main Results:

  • Glucose limitation induces both macroautophagy and a novel microautophagy pathway for proteasome degradation.
  • Microautophagy selectively targets aberrant proteasomes, while functional ones accumulate in PSGs.
  • AMP-activated protein kinase (AMPK) and ESCRT factors are essential for proteasome microautophagy and subsequent PSG dynamics.
  • The insoluble protein deposit (IPOD) compartment serves as an alternative proteasome homeostasis mechanism.

Conclusions:

  • Yeast cells exhibit remarkable plasticity in proteasome management during starvation, utilizing parallel macro- and micro-autophagy pathways.
  • AMPK- and ESCRT-dependent microautophagy represents a novel mechanism for controlling proteasome quality.
  • Understanding these pathways offers potential therapeutic targets for diseases linked to proteasome dysfunction.