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Autophagy01:27

Autophagy

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Autophagic Cell Death01:18

Autophagic Cell Death

Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
The Proteasome01:13

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...

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Related Experiment Video

Updated: Jun 16, 2026

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

Autophagy in unicellular eukaryotes.

Jan A K W Kiel1

  • 1Molecular Cell Biology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, PO Box 14, 9750 Haren, The Netherlands. j.a.k.w.kiel@rug.nl

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|February 4, 2010
PubMed
Summary

Autophagy recycles cellular components to provide building blocks and energy when nutrients are scarce. This process is crucial for survival, cellular housekeeping, and even developmental changes in unicellular eukaryotes.

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Last Updated: Jun 16, 2026

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body
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Analyzing Starvation-Induced Autophagy in the Drosophila melanogaster Larval Fat Body

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Unicellular eukaryotes rely on external nutrients for macromolecule synthesis.
  • Nutrient depletion triggers autophagy to catabolize cytoplasmic components for reuse and ATP production.
  • Autophagy is vital for cellular housekeeping and survival.

Purpose of the Study:

  • To review the molecular mechanisms of autophagy in unicellular eukaryotes.
  • To highlight the role of selective autophagy pathways.
  • To analyze the function of autophagy in the differentiation of non-yeast unicellular eukaryotes.

Main Methods:

  • Literature review of autophagy mechanisms.
  • Analysis of selective autophagy pathways (pexophagy, mitophagy, ER-phagy, ribophagy, nuclear microautophagy).
  • Focus on autophagy in non-yeast unicellular eukaryotes and their differentiation.

Main Results:

  • Autophagy encompasses diverse biogenetic and catabolic processes.
  • Selective autophagy pathways are conserved and essential.
  • Autophagy plays a critical role in the differentiation of certain unicellular eukaryotes.

Conclusions:

  • Autophagy is a fundamental process for unicellular eukaryote survival and adaptation.
  • Understanding autophagy mechanisms provides insights into cellular stress responses and development.
  • Further research on non-yeast unicellular eukaryotes will elucidate conserved and unique roles of autophagy.