Related Experiment Video
Updated: Jul 10, 2026
09:40
In Vivo Detection and Analysis of Rb Protein SUMOylation in Human Cells
Published on: November 2, 2017
SUMO, ubiquitin's mysterious cousin.
S Müller1, C Hoege, G Pyrowolakis
1Max Planck Institute of Biochemistry, Department of Molecular Cell Biology, Am Klopferspitz 18a, 82152, Martinsried, Germany. stmuelle@biochem.mpg.de
Nature Reviews. Molecular Cell Biology
|March 27, 2001
Summary
Small ubiquitin-like modifier (SUMO)ylation covalently modifies proteins, regulating key cellular functions like nuclear transport and cell-cycle progression. Unlike ubiquitylation, SUMOylation enhances protein stability and compartmentalization rather than targeting them for degradation.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Covalent modification of proteins by SUMOylation regulates crucial cellular processes.
- SUMOylation impacts nuclear transport, signal transduction, stress response, and cell-cycle progression.
Purpose of the Study:
- To elucidate the distinct roles of SUMOylation in cellular protein regulation.
- To differentiate SUMOylation from ubiquitylation in protein fate determination.
Main Methods:
- Analysis of protein modification pathways.
- Investigating the effects of SUMOylation on protein stability.
- Studying the impact of SUMOylation on subcellular protein localization.
Main Results:
- SUMOylation regulates diverse cellular functions including nuclear transport and cell-cycle progression.
- SUMOylation does not target proteins for degradation, unlike ubiquitylation.
- SUMOylation appears to enhance protein stability and modulate subcellular compartmentalization.
Conclusions:
- SUMOylation is a critical regulatory mechanism for protein function and localization.
- SUMOylation offers a distinct pathway from ubiquitylation for modulating protein fate.
- Understanding SUMOylation is key to comprehending cellular regulation and stability.
Related Concept Videos
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
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...
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
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...