Related Experiment Video
Updated: Jun 25, 2026
09:45
In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
Published on: January 29, 2018
Crosstalk between the SUMO and ubiquitin pathways
1Molecular and Cell Biology Laboratory, The Salk Institute, 10010 North Torrey Pines Road, La Jolla, CA 920137-1099, USA. hunter@salk.edu
Ernst Schering Foundation Symposium Proceedings
|February 10, 2009
Summary
SUMOylation and ubiquitination pathways communicate through crosstalk. RNF4 E3 ubiquitin ligases specifically target SUMOylated proteins for ubiquitination, revealing a key regulatory mechanism.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- The SUMO (Small Ubiquitin-like Modifier) and ubiquitin pathways are crucial post-translational modification systems.
- These pathways regulate diverse cellular processes, including gene expression, DNA repair, and protein stability.
- Recent discoveries highlight intricate crosstalk mechanisms between SUMOylation and ubiquitination.
Purpose of the Study:
- To review the principles of crosstalk between SUMOylation and ubiquitination.
- To focus on the role of the RNF4 family of RING finger E3 ubiquitin ligases in mediating this crosstalk.
- To elucidate how SUMOylation status influences protein ubiquitination.
Main Methods:
- Literature review of recent findings on SUMO-ubiquitin crosstalk.
- Analysis of the molecular mechanisms employed by RNF4 E3 ubiquitin ligases.
- Examination of protein interaction studies and functional assays.
Main Results:
- SUMOylation and ubiquitination pathways exhibit significant crosstalk.
- RNF4 E3 ubiquitin ligases act as key mediators, specifically recognizing SUMOylated substrates.
- This recognition facilitates the subsequent ubiquitination of SUMOylated proteins.
Conclusions:
- The RNF4 family of E3 ligases provides a direct link between SUMOylation and ubiquitination.
- This crosstalk mechanism is critical for regulating protein fate and cellular functions.
- Understanding this interplay offers insights into novel therapeutic strategies.
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...
02:58Regulated 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...
01:19Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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.