Cysteine Protease

CA-074 methyl ester (Cathepsin B Inhibitor IV) is a specific inhibitor of Cathepsin B with neuroprotective, anti-cancer, and anti-inflammatory effects.

Leupeptin hemisulfate is a protease inhibitor with cell membrane-permeable, reversible, competitive, and oral activities. Leupeptin hemisulfate inhibits the activity of Cathepsin B, Cathepsin H, and Cathepsin L, and blocks fusion of amphipathic lysosomes. Leupeptin hemisulfate also has anti-inflammatory activity.

MIV-247 is a selective and potent inhibitor of cathepsin S (Kis 2.1, 4.2, and 7.5 nM for human, mouse, and wild monkey cathepsin S, respectively), which attenuates mechanical anomalies in preclinical models of neuropathic pain, and can be used to study cardiac muscle injury.

LY 3000328 (Cathepsin S inhibitor) is a selective inhibitor of cathepsin S with IC50 values ​​of 7.7 and 1.67 nM for human and mouse cathepsin S, respectively. LY 3000328 (Cathepsin S inhibitor) may slow or prevent abdominal aortic aneurysm (AAA) expansion and or reduce the risk of AAA rupture by inhibiting cathepsin S-mediated degradation of extracellular matrix proteins, elastin and collagen.

ONO-5334 is a selective, orally active and potent histone K inhibitor with anti-SAR-COV-2 and anti-bone resorption activity for the study of osteoporosis.

VBY-825 is a reversible inhibitor of cathepsin with high potency against cathepsins B, L, S and V.

N-Ethylmaleimide (NEM) is a reagent for alkylation of free sulfhydryl groups, a cysteine protease inhibitor used in experimental biochemistry. N-Ethylmaleimide is also a deubiquitinating enzyme inhibitor that specifically inhibits phosphate transport in mitochondria.

Aloxistatin (E64d) is an inhibitor of cysteine protease with blood platelet aggregation inhibiting activity. Aloxistatin is an irreversible, membrane-permeable inhibitor of lysosomal and cytosolic cysteine proteases with the ability to inhibit calpain activity in intact platelets.

Phenylmethanesulfonyl fluoride (PMSF (Phenylmethylsulfonyl fluoride)) is an enzyme inhibitor that inactivates IRC-50 arvin, subtilisin, and the fatty acid synthetase complex.

K777 is a potent, orally active, and irreversible inhibitor of cysteine protease, functioning as a potent CYP3A4 inhibitor (IC50 = 60 nM) and a selective CCR4 antagonist, which inhibits chemotaxis. K777 irreversibly inhibits Cruzain, the major cysteine protease of Trypanosoma cruzi, and cathepsins B and L, targeting cathepsin-mediated cell entry and exhibiting broad-spectrum antiviral activity. It inhibits EBOV and SARS-CoV pseudovirus entry with IC50 values of 0.87 nM and 0.68 nM, respectively.

E-64 (Proteinase inhibitor E 64) is an irreversible and specific inhibitor of cysteine proteases, exhibiting an IC50 of 9 nM for papain.

MK-0674 is an orally available, selective and potent cathepsin K inhibitor (IC50: 0.4 nM) that inhibits Cat B, Cat F, Cat L, and Cat S. It can be used in metabolism-related diseases.

Papain, a cysteine protease of the peptidase C1 family, is utilized in the food, pharmaceutical, textile, and cosmetic industries.

Dazcapistat is a potent calpain inhibitor with IC50s of <3 μM for calpain 1, calpain 2, and calpain 9, respectively.

Aurantiamide acetate (Asperglaucide) was isolated from the fermentation broth of Aspergillus penicilloides for the first time. Aurantiamide acetate is a selective and orally active cathepsin inhibitor. Aurantiamide acetate has anti-inflammatory activities and can be used for the study of inflammatory diseases[1][2].

Calpeptin is a potent, cell-permeable calpain inhibitor.

Petesicatib (RG 7625) is a small molecule histone-S (Cat-S) inhibitor for the study of primary dry syndrome and autoimmune diseases.

Cathepsin D and E FRET Substrate acetate is a fluorogenic substrate for cathepsins D and E but not for B, H, or L. Cathepsin D and E FRET Substrate acetate can be used in mechanistic studies on cathepsins D and E studies.

Odanacatib is an inhibitor of cathepsin K with potential anti-osteoporotic activity.

MG-101 (Calpain inhibitor I) is a cell-permeable and potent inhibitor of cysteine proteases including calpains and lysosomal cathepsins.

Isovalerylcarnitine (3-methylbutyrylcarnitine) is a small molecule compound produced by the catabolism of L-leucine and the accumulation of isovaleric acid. Isovalerylcarnitine is also a selective and effective calpain activator that can promote cell apoptosis. Isovalerylcarnitine is related to isovaleric acidemia and can be used as a marker of isovaleric acidemia.

3,4 Dichloroisocoumarin is a granzyme, cathepsin G, and neutrolphil elastase inhibitor

Tacalcitol monohydrate(Curatoderm monohydrate), a vitamin D3 analog that promotes bone development by regulating calcium ions, can be used to study psoriasis.

3-Epiursolic acid may have antiinflammatory activity, it shows inhibition on Cathepsins L (catL), the IC50 value of 6.5 μM, cathepsins L (catL) and B play an important role in tumor progression and have been considered promising therapeutic targets in the

SID 26681509 is a selective, reversible and competitive human cathepsin L inhibitor (IC50 of 56 nM).

Cathepsin Inhibitor 1 is an inhibitor of Cathepsin (L, L2, S, K, B) with pIC50 of 7.9, 6.7, 6.0, 5.5 and 5.2, respectively.

FMK 9a is an irreversible inhibitor of ATG4B with IC50 values of 80 and 73 nM in the TR-FRET and cellular-based LRA assays.

CA 074 is a potent inhibitor of cathepsin B with a Ki value of 2 to 5 nM.CA 074 inhibits ischemic hippocampal neuronal death in primates and attenuates retinopathy and optic neuritis in experimental autoimmune encephalomyelitis induced by SJL/J mice.

Z-FA-FMK can irreversibly inhibit cysteine protease and also inhibit effector caspases.

Cathepsin X-IN-1 (compound 25) is a potent Cathepsin X inhibitor (IC50 = 7.13 μM) that reduces PC-3 cell migration with low cytotoxicity [1].

2-Aminoethanethiol (Cysteamine) is a Cystine Depleting Agent. The mechanism of action of cysteamine is as a Cystine Disulfide Reduction.

KGP94 is an inhibitor of cysteine protease Cathepsin L(CTSL).

MDL-28170 (Calpain Inhibitor III) is a cysteine protease.

JTE-607 is a cytokine production inhibitor. JTE-607 induces apoptosis accompanied by an increase in p21waf1 cip1 in acute myelogenous leukemia cells.

PD150606 is a selective nonpeptide calpain inhibitor with neuroprotective activity that inhibits μ-calpains and m-calpains. Inhibits erythrocyanine-induced Ca2+ efflux and interferes with excitotoxicity-dependent motor neuron death.

Balicatib (AAE581) is a potent and selective inhibitor of cathepsin K, used in trials studying the treatment of osteoporosis.

Esomeprazole is the S-isomer of omeprazole, inhibits the lysosomal cysteine protease legumain to prevent cancer metastasis. Esomeprazole is a proton pump inhibitors (PPI).

(S)-(+)-Ibuprofen (Dexibuprofen) , is a non-steroidal anti-inflammatory drug (NSAID), inhibiting cyclooxygenase (COX).

PD151746 is a calpain inhibitor with a 20-fold selectivity for u-calpain (Ki = 0.26 ± 0.03 μM) over m-calpain (Ki = 5.33 ± 0.77 μM). Its IC50 values are 0.26 ± 0.03 μM (Ki for μ-calpain) and 5.33 ± 0.77 μM (Ki for m-calpain) [1]. In vitro, PD151746 targets calpain and reduces oxLDL-induced cytotoxicity [2].

NSC 185058, an inhibitor of ATG4B (a major cysteine protease), can also attenuate autophagic activity.

E 64c (EP 475) , a derivative of E-64, is an irreversible and membrane-permeant cysteine protease inhibitor.

Z-Lys-OH is a competitive inhibitor of papain, a lysine derivative.

L-006235 is a potent and reversible inhibitor of cathepsin K with IC50 of 0.25 nM.

Calpain Inhibitor XII (Z-L-Nva-CONH-CH2-2-Py) is a selective and potent inhibitor of calpain I, inhibits calpain II and cathepsin B. Calpain Inhibitor XII shows antiviral activity against coronavirus in cell culture.

2-Cyanopyrimidine (m-Hydroxyphenylpropionic acid) is inhibitor of cathepsin K(IC50 : 170 nM)

Acetyl-Calpastatin (184-210)(human) acetate is a potent, selective and reversible calpain inhibitor with Ki values of 0.2 nM and 6 μM for µ-calpain and cathepsin L, respectively.

(1S,2R)-Alicapistat ((1S,2R)-ABT-957) is a highly efficient, orally active compound that selectively inhibits human calpains 1 and 2, showing promise for Alzheimer's disease (AD) therapy [1]. It effectively addresses the metabolic liability associated with carbonyl reduction and demonstrates potent inhibition of calpain 1 with an IC50 value of 395 nM [2].

Aureusimine B, also known as phevalin, is a natural pyrazinone produced by certain fungi and by Staphylococcus spp., including S. aureus. Its synthesis appears to be initiated by a conserved nonribosomal peptide synthetase that creates a dipeptide (phenylalanine-valine) aldehyde, which then undergoes cyclization and oxidation. Aureusimine B inhibits calpain in a casein hydrolysis assay (IC50 = 1.3 μM), contributes to S. aureus infection in mice, and alters human keratinocyte gene expression.