Cathepsin Inhibitor

N-Ethylmaleimide (NEM) derives from maleic acid, it can alkylates free sulfhydryl. N-Ethylmaleimide is an irreversible cysteine protease inhibitor. N-ethylmaleimide specific inhibits phosphate transport in mitochondria. N-Ethylmaleimide inhibits prolyl endopeptidase with an IC₅₀ value of 6.3 μM. N-Ethylmaleimide can be used to modify cysteine residues in proteins and peptides.

Leupeptin hemisulfate is a broad-spectrum, membrane-permeable protease inhibitor. Leupeptin hemisulfate potently inhibits serine, cysteine and threonine proteases. Leupeptin hemisulfate inhibits M^pro (the main protease of SARS-CoV-2) and also has anti-inflammatory activity.

PMSF (Phenylmethylsulfonyl fluoride) is a nonspecific and irreversible serine proteases inhibitor. PMSF inhibits some thiol proteases, non-protease enzymes, and acetylcholinesterase. PMSF can be used to prepare protein extracts from tissue and cell lysates.

Aloxistatin (E64d) is a cell-permeable and irreversible broad-spectrum cysteine protease inhibitor. Aloxistatin (E64d) exhibits entry-blocking effect for MERS-CoV.

Y1693 is an orally active RANKL inhibitor with a K_d of 5.03 μM for hRANKL. Y1693 inhibits the activation of the downstream c-fos/NFATc1 signaling pathway by blocking its interaction with RANK. Y1693 significantly inhibits RANKL-induced osteoclast differentiation, F-actin ring formation and bone resorptive activity, while downregulating the mRNA and protein expressions of TRAP, cathepsin K, c-fos and NFATc1. Y1693 shows no obvious cytotoxicity to bone marrow-derived macrophages and osteoclast precursor cells, and exhibits favorable ADME properties. Y1693 improves ovariectomy-induced osteoporosis in mice and reverses ligation-induced periodontal alveolar bone loss. Y1693 is applicable to research related to osteoporosis and periodontal diseases.

Cathepsin L-IN-3 (Compound cat L inh. 7) TFA is selective a noncovalent cathepsin L inhibitor with a K_i of 4.3 nM.

E-64 (Proteinase inhibitor E 64) is a potent irreversible inhibitor against general cysteine proteases with IC₅₀ of 9 nM for papain.

CA-074 methyl ester is a specific inhibitor of Cathepsin B, which has potent bioactivities such as neuroprotective, anti-cancer, and anti-inflamatory effects.

Calpeptin is a potent, cell penetrating calpain inhibitor, with an ID₅₀ of 40 nM for Calpain I in human platelets. Calpeptin is also an inhibitor of cathepsin K.

CA-074 is a potent inhibitor of cathepsin B with a K_i of 2 to 5 nM.

LY 3000328 (Z-FL-COCHO) is a potent and selective Cathepsin S (Cat S) inhibitor with IC₅₀s of 7.7 and 1.67 nM for hCat S and mCat S, respectively.

Lactacystin is a potent, orally active, irreversible, cell-permeable, selective 20S proteasome inhibitor (IC₅₀ = 4.8 μM). Lactacystin also inhibits the lysosomal enzyme cathepsin A. Lactacystin inhibits cell growth and induces apoptosisand cell cycle arrest, and has antiviral and antioxidative activity. Lactacystin induces neurite outgrowth and hypertension. Lactacystin has the potential for the research of cancer, Neurological Disease, hypertension and Malaria, and so on^{[2] [6]} .

Z-FY-CHO (Z-Phe-Tyr-CHO) is a potent and specific cathepsin L (CTSL) inhibitor.

Odanacatib (MK-0822) is a potent and selective inhibitor of cathepsin K, with an IC₅₀ of 0.2 nM for human cathepsin K.

Cathepsin G Inhibitor I (Compound 7) is a potent, selective, reversible, competitive, non-peptidic Cathepsin G inhibitor (IC₅₀ = 53 nM; K_i = 63 nM). Cathepsin G Inhibitor I can be used in research related to immune disorders.

K777 is a potent, orally active and irreversible cysteine protease inhibitor. K777 is also a potent CYP3A4 inhibitor with an IC₅₀ of 60 nM. K777 irreversibly inhibits Cruzain, the major cysteine protease of Trypansoma cruzi, and cathepsins B and L. K777 is a broad-spectrum antiviral by targeting cathepsin-mediated cell entry. K777 inhibits SARS-CoV and EBOV pseudovirus entry with IC₅₀ values of 0.68 nM and 0.87 nM, respectively.

N-Ethylmaleimide-d₅ is the deuterium labeled N-Ethylmaleimide. N-Ethylmaleimide (NEM), a reagent that alkylates free sulfhydryl groups, is a cysteine protease inhibitor. N-ethylmaleimide specific inhibits phosphate transport in mitochondria. N-Ethylmaleimide is also a deubiquitinating enzyme inhibitor.

SID 26681509 is a potent, reversible, competitive, and selective inhibitor of human cathepsin L with an IC₅₀ of 56 nM. SID 26681509 inhibits in vitro propagation of malaria parasite Plasmodium falciparum and inhibits Leishmania major with IC₅₀s of 15.4 μM and 12.5 μM, respectively. SID 26681509 shows no inhibitory activity against cathepsin G.

Z-Gly-Pro-Arg-AMC hydrochloride a fluorescent trypsin and cathepsin K substrate. Z-Gly-Pro-Arg-AMC hydrochloride can be used to determine trypsin and cathepsin K activity.

Cathepsin inhibitor 1 (Compound 25) is a potent and selective inhibitor of Cathepsin, with pIC₅₀s of 7.9, 6.7, 6.0, 5.5 and 5.2 for CatL, CatL2, CatS, CatK, and CatB, respectively. Cathepsin inhibitor 1 is promising for research of osteoarthritis.