Related Experiment Video
Updated: Aug 17, 2025
07:56
Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
Published on: November 30, 2022
4.7K
Diversity of mitophagy pathways at a glance
Ian G Ganley1, Anne Simonsen2,3,4
1MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.
Journal of Cell Science
|December 12, 2022
Summary
Mitochondria quality control relies on mitophagy, a process where damaged mitochondria are degraded. Understanding mitophagy mechanisms is key to maintaining cellular health and preventing disease.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Mitochondria are vital organelles involved in cellular signaling and metabolism.
- Maintaining a healthy mitochondrial population requires balancing biogenesis and degradation.
- Dysfunctional mitochondria removal via mitophagy is crucial for cellular health.
Purpose of the Study:
- To describe the current understanding of mitochondrial recognition and targeting for lysosomal degradation.
- To discuss the regulation of mitophagy under various physiological conditions.
- To highlight the importance of mitophagy in maintaining mitochondrial and cellular health.
Main Methods:
- Literature review and synthesis of current research on mitophagy pathways.
- Analysis of molecular mechanisms involved in mitochondrial recognition by autophagy.
- Discussion of in vivo studies and physiological regulation of mitophagy.
Main Results:
- Mitochondria are recognized by autophagic machinery for degradation through specific pathways.
- Distinct mitophagy pathways contribute to the removal of damaged or excess mitochondria.
- Regulation of mitophagy is essential for maintaining mitochondrial homeostasis.
Conclusions:
- Mitophagy is a critical quality control pathway for cellular health.
- Further research into mitophagy mechanisms can elucidate disease pathologies.
- Understanding mitophagy regulation offers therapeutic potential for mitochondrial dysfunction.
Related Concept Videos
01:19Translocation of Proteins into the Mitochondria
3.2K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.2K
01:36Delivery Pathways to the Lysosome
6.7K
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...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
6.7K
01:39Mitochondrial Protein Sorting
4.4K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.4K
01:27Autophagy
4.5K
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,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
4.5K
01:13The Proteasome
982
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...
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...
982
01:32Export of Misfolded Proteins out of the ER
3.7K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.7K