Ubiquitination is a process in targeting proteins for degradation by the proteasome. Ubiquitin (Ub) is a 76 amino acid polypeptide which can be covalently attached to various cellular proteins by the ubiquitination process. This ubiquitin-proteasome system plays a vital role in cell division, growth, differentiation, transcriptional regulation, apoptosis and immunity etc. Three main types of enzymes are involved in the process of ubiquitination. In the ﬁrst step, activation of ubiquitin is carried out by ubiquitin-activating enzyme (E1) through an ATP-dependent reaction. In the second step, the activated ubiquitin is transferred from E1 to ubiquitin-conjugating enzyme (E2). In the final step, the ubiquitin protein ligase (E3) is required for labeling the ubiquitin to target substrate protein. An isopeptide bond is formed between the carboxyl terminus of ubiquitin and the ε-amino group of a lysine residue in the target protein.
Once the substrate protein is labeled, proteasome will bind to a polyubiquitin chain, allowing the degradation of the labeled protein. The polyubiquitinated target protein is then recognized and degraded by the 26S proteasome. Deubiquitinating enzymes (DUBs) reverse the process of ubiquitination by removing ubiquitin from its substrate protein. Dysregulation of the ubiquitin-proteasome system has been linked to cancer, diabetes, cardiovascular and neurodegenerative diseases etc.
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- B6032 CB-5083Target: p97Summary: p97 inhibitor
- B2151 STF-62247Target: AutophagySummary: Autophagy inducer in renal cell
- A8172 Dihydroeponemycin1 CitationSummary: Proteasome inhibitor,antitumor reagent,eponemycin ddrivative
- C4090 HMB-Val-Ser-Leu-VESummary: inhibitor of the trypsin-like activity of the 20S proteasome
- A8740 C598-0466Summary: USP7 inhibitor
- C3250 Ubiquitin Isopeptidase Inhibitor ISummary: ubiquitin isopeptidase inhibitor
- B6179 VPS34-IN1Summary: Vps34 inhibitor
- B6174 MRT68921Summary: dual autophagy kinase ULK1/2 inhibitor
- B6160 PIK-III1 CitationSummary: VPS34 inhibitor and inhibits autophagy
- B6122 ML241 hydrochlorideSummary: p97 ATPase inhibitor