Related Experiment Video
Updated: May 31, 2026
09:05
Cycloheximide Chase Analysis of Protein Degradation in Saccharomyces cerevisiae
Published on: April 18, 2016
Ubiquitin-dependent mitochondrial protein degradation.
1Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
The International Journal of Biochemistry & Cell Biology
|June 21, 2011
Summary
Mitochondrial dysfunction drives aging diseases. The cytosolic ubiquitin/proteasome system (UPS) degrades damaged mitochondrial proteins, offering therapeutic targets for age-related pathologies.
Area of Science:
- Biochemistry
- Cell Biology
- Gerontology
Background:
- Mitochondrial failure is linked to aging and disease.
- Mitochondrial respiration produces energy (ATP) and harmful reactive oxygen species (ROS).
- Maintaining mitochondrial function is crucial for preventing age-related diseases.
Purpose of the Study:
- To review the role of the cytosolic ubiquitin/proteasome system (UPS) in mitochondrial protein quality control.
- To discuss the implications of UPS-dependent mitochondrial protein degradation in disease.
- To highlight future research directions.
Main Methods:
- Literature review of studies on mitochondrial protein quality control.
- Analysis of the involvement of the ubiquitin/proteasome system (UPS) in mitochondrial homeostasis.
- Examination of disease models related to mitochondrial dysfunction.
Main Results:
- The cytosolic ubiquitin/proteasome system (UPS) actively participates in degrading damaged mitochondrial proteins.
- Dysregulation of UPS-mediated mitochondrial protein turnover is implicated in the progression of age-related diseases.
- Targeting UPS pathways may offer novel therapeutic strategies.
Conclusions:
- The UPS is a key component of mitochondrial protein quality control.
- Understanding UPS-mitochondria interactions is vital for combating age-related pathologies.
- Further investigation into UPS-dependent degradation pathways holds therapeutic promise.
Related Concept Videos
01:13The 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...
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...
02:18The 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...
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...
02:18The 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...
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...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
01:19Translocation of Proteins into the Mitochondria
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,...