Ubiquitination/ Proteasome - 20S proteasomal chymotrypsin - Ubiquitin-specific proteases - ULK1 - NMPRTase
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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- A8715 SBI-02069652 CitationTarget: ULK1Summary: ULK1抑制剂
- A8631 FK 866 hydrochlorideTarget: NMPRTaseSummary: NMPRTase抑制剂
- A4443 Gliotoxin1 CitationTarget: 20S proteasomal chymotrypsin|Geranylgeranyltransferase I|FarnesyltransferaseSummary: 20S蛋白酶体抑制剂
- A3023 P0050911 CitationTarget: Ubiquitin-specific proteasesSummary: 泛素特异性蛋白酶7(USP7)抑制剂