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Updated: May 23, 2026

Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates
Published on: May 10, 2022
The ubiquitin-proteasomal system is critical for multiple myeloma: implications in drug discovery
1Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, The First Affiliated Hospital, Soochow University Suzhou, China.
Abstract:
Bortezomib is a specific inhibitor of proteasomes, the most important protease complexes in protein degradation. Bortezomib can induce apoptosis of a variety of cancer cells, including leukemia, lymphoma, multiple myeloma, breast cancers, prostate cancers, lung cancers, and so on. However, extensive studies and overall evaluation suggested that multiple myeloma is the most sensitive and the best responsive disease which was later approved by Food and Drug Administration for bortezomib treatment. Because proteasomes are an essential component in the ubiquitin-proteasomal protein degradation pathway, the discovery of bortezomib implicates that the UPS is critical for myeloma pathophysiology. The UPS also contains ubiquitin, ubiquitin-activating enzymes (E1), ubiquitin-conjugating enzymes (E2), ubiquitin ligases (E3) and deubiquitinases (Dubs). In this review, we examined and analyzed the recent advancements of the UPS components in multiple myeloma and its implications in drug discovery for myeloma treatment.
Insights
Bortezomib effectively targets proteasomes, crucial for protein degradation, showing significant promise in treating multiple myeloma. This review explores the ubiquitin-proteasomal system
Area of Science:
- Molecular Biology
- Oncology
- Biochemistry
Background:
- Proteasomes are key protease complexes in protein degradation.
- Bortezomib, a proteasome inhibitor, induces apoptosis in various cancer cells.
- Multiple myeloma exhibits high sensitivity and responsiveness to bortezomib treatment.
Purpose of the Study:
- To review recent advancements in ubiquitin-proteasomal system (UPS) components.
- To analyze the role of the UPS in multiple myeloma pathophysiology.
- To discuss the implications of UPS research in drug discovery for myeloma.
Main Methods:
- Literature review of scientific publications.
- Analysis of studies on proteasome inhibitors and the UPS.
- Examination of bortezomib's mechanism of action and clinical efficacy.
Main Results:
- The ubiquitin-proteasomal system is critical for multiple myeloma.
- Bortezomib's efficacy in multiple myeloma is well-established.
- Understanding UPS components offers new avenues for drug development.
Conclusions:
- The UPS is a vital therapeutic target in multiple myeloma.
- Targeting the UPS, particularly with inhibitors like bortezomib, is effective.
- Further research into UPS components can lead to novel myeloma therapies.
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