Proteasomes are very large protein complexes inside all eukaryotes and archaea, and in some bacteria. In eukaryotes, they are located in the nucleus and the cytoplasm. The main function of the proteasome is to degrade unneeded or damaged proteins by proteolysis, a chemical reaction that breaks peptide bonds. Enzymes that carry out such reactions are called proteases. Proteasomes are part of a major mechanism by which cells regulate the concentration of particular proteins and degrade misfolded proteins. The degradation process yields peptides of about seven to eight amino acids long, which can then be further degraded into amino acids and used in synthesizing new proteins. Proteins are tagged for degradation with a small protein called ubiquitin. The tagging reaction is catalyzed by enzymes called ubiquitin ligases. Once a protein is tagged with a single ubiquitin molecule, this is a signal to other ligases to attach additional ubiquitin molecules. The result is a polyubiquitin chain that is bound by the proteasome, allowing it to degrade the tagged protein.
Cat. No. | Product Name | CAS No. | Information |
---|---|---|---|
H9428 |
ACU-D1 |
26347-98-8 | ACU-D1 is a First-in-Class, novel,efficacy and safety inhibitor of the 26S protea-some for the treatment of moderate to severe rosacea. |
H7288 |
UK-101 |
1000313-40-5 | A potent, specific immunoproteasome β1i (LMP2) subunit inhibitor with IC50 of 104 nM, 144- and 10-fold selectivity over β1c and β5 subunit respectivey; induces apoptosis of PC-3 cells and results in significant inhibition (~50-60%) of tumour growth in vivo, does not block degradation of IκBα in PC-3 cells treated with TNF-α. |
H7287 |
TCH-165 |
1446350-60-2 | TCH-165 is a specific small molecule modulator of proteasome assembly, regulates the dynamic equilibrium between the 20S and 26S proteasome complexes, favoring 20S-mediated protein degradation; enhances the degradation of both α-syn and tau, does not induce the degradation of GAPDH, enhances the degradation of intrinsically disordered proteins in cell culture; display a decrease in assembled 26S and an increase in 20S proteasome in treated cells. |
H7286 |
Rpn11 inhibitor 35 |
2084868-04-0 |
Rpn11 inhibitor 35 is a potent, small molecule inhibitor of the proteasome subunit Rpn11 with IC50 of 400 nM,100-fold selectivity over Csn5 and 10-fold selectivity over AMSH; inhibits 293T and A549 cells proliferation with IC50 of 2.1 and 3.8 uM, respectively. |
H7285 |
RA190 |
1617495-03-0 |
RA190 (RA-190)?is a reversible, highly selective, orally active inhibitor of the proteasomal ubiquitin receptor Rpn13, exhibits potent anti-proliferative effects against MM lines (IC50<0.1 uM) and HPV-transformed cells (IC50<0.3 uM); inhibits proteasome function, triggering rapid accumulation of polyubiquitinated proteins; profoundly reduced growth of MM and ovarian cancer xenografts. |
H7284 |
PR-924 |
1416709-79-9 | A potent, specific immunoproteasome LMP7 subunit inhibitor with IC50 of 25 nM, >100-fold selectivity over β5c, β1i, β1c, β2i and β2c subunits (IC50>3 uM); shows weak activity toward LMP2 and no detectable activity toward β1, β2, or MECL1. |
H7283 |
PR-893 |
1426305-23-8 | A potent, specific immunoproteasome β5 subunit inhibitor with IC50 of 17 nM, 21-fold and 13-fold selectivity for β5 over LMP7 and LMP2 subunits, respecitvely. |
H7282 |
PR-825 |
935888-08-7 | A potent, specific immunoproteasome β5 subunit inhibitor. |
H7281 |
PI-1840 |
1401223-22-0 | PI-1840 is a potent, selective, noncovalent, reversible inhibitor for proteasome chymotrypsin-like (CT-L) activity with IC50 of 27 nM, shows no effect on trypsin-like and peptidylglutamyl peptide hydrolyzing activities (IC50>100 uM); also displays 100-fold more selectivity for the constitutive proteasome over the immunoproteasome; induces the accumulation of proteasome substrates p27, Bax, and IκB-α, inhibits survival pathways and viability, and induces apoptosis in intact cancer cells, also sensitizes human cancer cells to the mdm2/p53 disruptor Nutlin; suppresses the growth in nude mice of human breast tumor xenografts. |
H7280 |
PD-151746 |
179461-52-0 | A potent, selective, cell-permeable Calpain inhibitor with Ki of 0.26 uM for m-calpain; displays 20-fold selectivity over m-calpain; attenuates the SLLVY-AMC hydrolysis induced by maitotoxin in SY5Y cells; decreases cytotoxicity induced by oxidized low-density lipoprotein (oxLDL) in HMEC-1 cells. |
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