proteasome inhibitor 1

Immunoproteasome inhibitor 1 is a highly potent and reversible inhibitor of both immunoproteasome and proteasome activity. It exhibits time-independent inhibitory effects on immunoproteasome subunits β5c, β1i, and β5i, with respective Ki values of 1.18 μM, 0.27 μM, and 1.91 μM. This compound shows promising potential for the treatment of select neoplastic diseases [1].

PSI is a proteasome inhibitor.

Proteasome inhibitor IX (PS-IX) is an inhibitor of chymotrypsin-like activity of the 20S proteasome (IC50 ~1 μM). Proteasome inhibitor IX shows potent anticancer activity. Proteasome inhibitor IX exhibits HCT116 p53+/+ cells growth inhibitory activity(IC50 = 1.49 μM).

GSK3494245 is a Leishmania donovani inhibitor that suppresses trypsin-like activity catalyzed by the β5 subunit of L. donovani proteasome, applicable for visceral leishmaniasis (VL) studies.

VR23 is a potent proteasome inhibitor. Data shows IC50 =1 nM for trypsin-like proteasomes, IC50=50-100 nM for chymotrypsin-like proteasomes, and IC50=3 μM for caspase-like proteasomes.

DD1 (HUN85111) is a proteasome inhibitor that induces human myeloid tumor-selective apoptosis.

Dicyclanil is an insect growth regulator with a chemical structure similar to that of cyclopromazine.

Proteasome-IN-1 is an inhibitor of proteasome.

UT-34 is a selective and orally active antagonist of second-generation pan-androgen receptor (AR) and degrader(IC50s of 211.7 nM, 262.4 nM and 215.7 nM for wild-type, F876L and W741L AR, respectively), and has anti-prostate cancer efficacy.

Radicicol (Monorden) is an antifungal antibiotic and a potent inhibitor of heat shock protein 90 (Hsp90), which leads to the degradation of Hsp90 by the proteasome by binding to its ATP-binding pocket. In addition, Radicicol inhibits the growth and proliferation of several tumor cell lines. It also has anti-malarial activity and acts as an inhibitor of adipose- and obesity-related proteins (FTO). Radicicol inhibits iNOS gene expression by blocking the p38 kinase signaling pathway and NF-kB/Rel

Rpn11-IN-1 is an effective and selective inhibitor of proteasome subunit Rpn11 (IC50: 390 nM).

SNIPER(BRD)-1 is a chemical compound composed of a derivative of the IAP antagonist LCL-161 and the BET inhibitor (+)-JQ-1, linked together. It promotes the degradation of BRD4 through the ubiquitin-proteasome pathway and effectively degrades cIAP1, cIAP2, and XIAP with IC50 values of 6.8 nM, 17 nM, and 49nM, respectively[1].

PIN1degrader-1 (Compound 158H9) is an inhibitor of the peptidyl-prolyl cis-trans isomerase (Pin1), with an IC50 of 21.5 nM. It covalently binds to Cys113 on Pin1, inducing conformational changes that decrease the protein's stability and lead to proteasome-dependent degradation. PIN1degrader-1 also inhibits the viability of various cancer cells, making it useful for cancer research.

TrxR/EGFR-IN-1 (Compound L1Au2) is a TrxR/EGFR inhibitor with activity against both gefitinib-sensitive and -resistant lung cancer, effectively suppressing tumor proliferation and promoting apoptosis. It enhances GPX4 degradation through autophagosome-lysosome and proteasome pathways, leading to ferroptosis. Additionally, it induces endoplasmic reticulum stress and triggers immunogenic cell death, making it applicable for studies on gefitinib-resistant lung cancer.

PARP-1/Proteasome-IN-1 (compound 42i) is a dual inhibitor of PARP-1 and the proteasome, demonstrating significant inhibitory effects on breast cancer. By downregulating the expression of BRCA1 and RAD51, it impairs homologous recombination repair and induces apoptosis (cellular death).

KMS99220 is an orally active Keap-1 activator that acts as an Nrf2 inhibitor protein. It enhances Nrf2 nuclear translocation, increases the expression of antioxidant enzymes (such as heme oxygenase-1) and proteasome subunit genes, and alleviates oxidative stress and protein aggregation damage. KMS99220 is applicable for research in Parkinson's disease (PD).

SF-9-2 is a PD-L1/PD-1 binding inhibitor with an IC50 of 24.9 nM. It suppresses epithelial-mesenchymal transition, migration, invasion, and proliferation of SK-N-SH cells, while also inducing apoptosis and causing cell cycle arrest. SF-9-2 blocks PD-L1-induced growth of SK-N-SH cells via the MAPK signaling pathway. It restores GSK-3β activity and enhances PD-L1 degradation through the ubiquitin-proteasome pathway. In the SK-N-SH NOG mouse model, SF-9-2 inhibits tumor growth without notable toxicity. Additionally, SF-9-2 acts as an immune checkpoint inhibitor, blocking PD-L1 to restore T cell function and is applicable to neuroblastoma research.

MG-115 (Z-LL-Nva-CHO) is a potent and reversible inhibitor of proteasome , with K i s of 21 nM and 35 nM for 20S and 26S proteasome, respectively. MG-115 specifically inhibit the chymotrypsin-like activity of the proteasome, induces p53-dependent apoptosis [1] [2] [3].

MG-262 is a reversible proteasome inhibitor with multiple biological activities (MGCD-162, Mills 2004) (Morrison et al., 2005, Li et al., 2006) (Tang et al., 2006, Zhang et al., 2007).

C6 urea ceramide is an inhibitor of neutral ceramidase.1 It increases total ceramide levels in wild-type mouse embryonic fibroblasts (MEFs) and in HT-29 colon cancer cells but not in MEFs lacking neutral ceramidase. It inhibits proliferation of, and induces apoptosis and autophagy in HT-29, but not non-cancerous RIE-1, cells when used at concentrations of 5 and 10 μM. C6 urea ceramide decreases total β-catenin, increases phosphorylated β-catenin, and induces colocalization of β-catenin with the 20S proteasome in HT-29 and HCT116, but not RIE-1, cells. It reduces tumor growth and increases C16, C18, C20, and C24 ceramide levels in tumor tissue in an HT-29 mouse xenograft model when administered at doses of 1.25, 2.5, and 5 mg/kg for five days. |1. García-Barros, M., Coant, N., Kawamori, T., et al. Role of neutral ceramidase in colon cancer. FASEB J. 30(12), 4159-4171 (2016).

KZR-616, a first-in-class inhibitor of the immunoproteasome, selectively targets the LMP7 (IC50: 39/57 nM=hLMP7/mLMP7) and LMP2 (IC50: 131/179 nM=hLMP7/mLMP7) subunits of the immunoproteasome. KZR-616 has the potential for the research of multiple autoimmune diseases[1][2]. KZR-616 also inhibits MECL-1 subunit (IC50=623 nM) and constitutive proteasome β5 subunit (IC50=688 nM). KZR-616 maintains LMP7 and LMP2 selective inhibition in MOLT-4 cells. KZR-616 (250 nM) shows a comparable cytokine inhibition profile peripheral blood mononuclear cells (PBMC)[1].KZR-616 is an immunoproteasome-selective inhibitor identified based on the optimization of ONX-0914 and PR-924 [3]. KZR-616 (5 mg/kg; i.v.; dosing was repeated on days 6, 8, 11, and 13) shows efficacy in the anticollagen antibody induced arthritis (CAIA) model[1]. [1]. Johnson HWB, et al. Required Immunoproteasome Subunit Inhibition Profile for Anti-Inflammatory Efficacy and Clinical Candidate KZR-616 ((2 S,3 R)- N-(( S)-3-(Cyclopent-1-en-1-yl)-1-(( R)-2-methyloxiran-2-yl)-1-oxopropan-2-yl)-3-hydroxy-3-(4-methoxyphenyl)-2-(( S)-2-(2-morpholinoacetamido)propanamido)propenamide). J Med Chem. 2018 Dec 27;61(24):11127-11143. [2]. Muchamuel T, et al. FRI0296 Kzr-616, a selective inhibitor of the immunoproteasome, blocks the disease progression in multiple models of systemic lupus erythematosus (SLE). Annals of the Rheumatic Diseases 2018;77:685. [3]. Xi J, et al. Immunoproteasome-selective inhibitors: An overview of recent developments as potential drugs for hematologic malignancies and autoimmune diseases. Eur J Med Chem. 2019;182:111646.

VCP/p97 inhibitor-1, a highly effective compound, inhibits VCP/p97 (also known as Cdc48, CDC-48, or Ter94) with an IC 50 of 54.7 nM. This inhibitor induces a disruption in protein homeostasis and interferes with the degradation process of misfolded polypeptides by the ubiquitin-proteasome system (UPS).

ONX-0914 (PR-957) is a potent and highly specific immunoproteasome inhibitor with minimal cross-reactivity to the constitutive proteasome.

20S Proteasome-IN-4 (Compound 7) is an orally active inhibitor of the 20S proteasome, selectively targeting the parasite form and demonstrating brain penetration capabilities. It exhibits a potent IC50 value of 6.3 nM against the T. b. brucei 20S proteasome, making it suitable for human African trypanosomiasis (HAT) research [1].