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Ubiquitin-mediated pathways for intracellular proteolysis.
1Department of Biochemistry, School of Medicine, University of Utah, Salt Lake City 84132.
Annual Review of Cell Biology
|January 1, 1987
Summary
Ubiquitination is a key protein modification involving the large ubiquitin (Ub) molecule. This process regulates diverse cellular functions beyond just protein degradation.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Ubiquitination is a post-translational modification similar to phosphorylation and acetylation.
- It involves the addition and removal of ubiquitin (Ub) by specific enzymes.
- Unlike other modifications, Ub is a large molecule, suggesting a significant role in cellular recognition.
Purpose of the Study:
- To explore the multifaceted roles of ubiquitination in cellular processes.
- To investigate the significance of ubiquitin's size and binding interactions.
- To understand ubiquitination's involvement beyond protein degradation.
Main Methods:
- Analysis of ubiquitination as a dynamic protein modification.
- Comparison of ubiquitin with other protein modification groups (acetate, phosphate).
- Examination of ubiquitin's covalent and noncovalent binding interactions with proteins.
Main Results:
- Ubiquitination involves distinct enzymes for addition and removal, with dynamic protein association.
- The large size of ubiquitin facilitates recognition by other cellular proteins.
- Ubiquitin is implicated in chromatin structure, proteolysis, cellular interactions, and stress response.
Conclusions:
- Ubiquitination is a multifunctional process, not solely for marking proteins for degradation.
- Ubiquitin acts as a reversible cross-linking reagent and potentially an intracellular barometer.
- Its distribution regulates various cellular activities, including chromatin structure and proteolysis.