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Pathways Recommended:	Metabolic Enzyme/Protease

Results for "

Cysteine Protease inhibitor

" in MedChemExpress (MCE) Product Catalog:

By Targets:	HCV Protease (1) Ser/Thr Protease (4) Virus Protease (12) Apoptosis (7) Atg4 (2) Autophagy (3) Bacterial (2) Beta-secretase (1) Biochemical Assay Reagents (1) Caspase (2) Cathepsin (31) CHIKV (3) Cholecystokinin Receptor (1) Cholinesterase (ChE) (1) Cytochrome P450 (2) Deubiquitinase (2) DNA/RNA Synthesis (1) Elastase (1) Filovirus (2) HCV (1) Histone Demethylase (1) HIV (1) HSV (3) Influenza Virus (1) MARCKS (1) MEK (1) Mitosis (1) NO Synthase (1) Parasite (8) PD-1/PD-L1 (1) PKC (1) Proteasome (8) Reactive Oxygen Species (ROS) (1) Reference Standards (4) SARS-CoV (20) Separase (1) TNF Receptor (1)
By Research Areas:	Cancer (13) Cardiovascular Disease (2) Infection (36) Inflammation/Immunology (13) Metabolic Disease (4) Neurological Disease (13)

By Targets:

HCV Protease (1)

Ser/Thr Protease (4)

Virus Protease (12)

Apoptosis (7)

Atg4 (2)

Autophagy (3)

Bacterial (2)

Beta-secretase (1)

Biochemical Assay Reagents (1)

Caspase (2)

Cathepsin (31)

CHIKV (3)

Cholecystokinin Receptor (1)

Cholinesterase (ChE) (1)

Cytochrome P450 (2)

Deubiquitinase (2)

DNA/RNA Synthesis (1)

Elastase (1)

Filovirus (2)

HCV (1)

Histone Demethylase (1)

HIV (1)

HSV (3)

Influenza Virus (1)

MARCKS (1)

MEK (1)

Mitosis (1)

NO Synthase (1)

Parasite (8)

PD-1/PD-L1 (1)

PKC (1)

Proteasome (8)

Reactive Oxygen Species (ROS) (1)

Reference Standards (4)

SARS-CoV (20)

Separase (1)

TNF Receptor (1)

By Research Areas:

Cancer (13)

Cardiovascular Disease (2)

Infection (36)

Inflammation/Immunology (13)

Metabolic Disease (4)

Neurological Disease (13)

Inhibitors & Agonists

Screening Libraries

Fluorescent Dyes

Biochemical Assay Reagents

Peptides

Natural
Products

Isotope-Labeled Compounds

GMP Molecules

Targets Recommended: Calpain Virus Protease ASCT HCV Protease HIV Protease Protease Activated Receptor (PAR) ClpP TMPRSS6 Serpin Enteropeptidase Ser/Thr Protease

Cat. No.	Product Name	Target	Research Areas	Chemical Structure

HY-D0843

N-Ethylmaleimide 35+ Cited Publications NEM	Cathepsin Deubiquitinase Apoptosis	Others
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 .

HY-18234A

Leupeptin hemisulfate 60+ Cited Publications	Cathepsin Ser/Thr Protease Virus Protease	Infection Inflammation/Immunology
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 .

HY-100229

Aloxistatin Maximum Cited Publications 85 Publications Verification E64d; E64c ethyl ester	Cathepsin SARS-CoV	Neurological Disease
Aloxistatin (E64d) is a cell-permeable and irreversible broad-spectrum **cysteine protease** inhibitor. Aloxistatin (E64d) exhibits entry-blocking effect for MERS-CoV.

HY-15282

E-64 20+ Cited Publications Proteinase inhibitor E 64	Cathepsin Autophagy Bacterial	Inflammation/Immunology Cancer
E-64 (Proteinase inhibitor E 64) is a potent irreversible inhibitor against general **cysteine proteases with IC₅₀ of 9 nM for papain**.

HY-18236

MDL-28170 15+ Cited Publications Calpain inhibitor III	Proteasome	Neurological Disease Inflammation/Immunology
MDL-28170 (Calpain Inhibitor III) is a potent, selective and membrane-permeable cysteine protease inhibitor of calpain that rapidly penetrates the blood-brain barrier following systemic administration . MDL-28170 also block γ-secretase .

HY-119293

K777 3 Publications Verification	Cathepsin Cytochrome P450 Parasite SARS-CoV Filovirus	Infection Inflammation/Immunology Cancer
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 .

HY-18964

MG-101 10+ Cited Publications Calpain inhibitor I; Ac-LLnL-CHO; ALLN	Proteasome Apoptosis	Cancer
MG-101 (ALLN) is an inhibitor of **cysteine proteases** which inhibits calpain I, calpain II, cathepsin B and cathepsin L with K_is of 190, 220, 150 and 500 pM, respectively. MG-101 induces apoptosis and inhibits tumor growth, it can be used for the research of colon cancer .

HY-125169

NSC 185058	Autophagy Atg4	Cancer
NSC 185058 is an inhibitor of ATG4B, a major **cysteine protease**. Inhibition of ATG4B using NSC 185058 markedly attenuates autophagic activity .

HY-D0843S

N-Ethylmaleimide-d5 NEM-d₅	Cathepsin Deubiquitinase	Others
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 .

HY-108137

Z-LVG-CHN2 2 Publications Verification	Cathepsin HSV SARS-CoV	Infection Inflammation/Immunology
Z-LVG-CHN2 is a cell-permeable and irreversible inhibitor of cysteine proteinase. Z-LVG-CHN2 is a tripeptide derivative and mimics part of the human cysteine proteinase-binding center. Z-LVG-CHN2 displays an inhibition on HSV whereas no significant effect on poliovirus replication. Z-LVG-CHN2 effectively blocks SARS-COV-2 replication (EC₅₀=190 nM) via inhibition of SARS-COV-2 3CL pro protease .

HY-137048

PF-00835231 4 Publications Verification	SARS-CoV HIV HCV	Infection
PF-00835231 is a CoV-2 cysteine 3C-like protease (3CL ^pro) inhibitor, with IC₅₀s of 0.27 nM and 4 nM for SARS CoV-2 and SARS CoV-1 3CL ^pro, respectively. PF-00835231 is developed for the research of anti-SARS-CoV-2/COVID-19. PF-00835231 can inhibit cell infections and also suppress infections in animal models .

HY-172437

Secutrelvir S-892216	Virus Protease SARS-CoV	Infection
Secutrelvir is an oral *SARS-CoV-2 3C-like protease* (3CLpro)** inhibitor and antiviral agent, with IC₅₀ values of 0.655 nM and 0.697 nM against SARS-CoV-2 3CLpro, respectively. Secutrelvir forms a reversible covalent bond with the catalytic cysteine C145 of SARS-CoV-2 3CLpro, thereby inhibiting viral replication. Secutrelvir exhibits activity against multiple SARS-CoV-2 variants and can be used in research related to coronavirus disease 2019 (COVID-19) .

HY-17541

**Cysteine Protease inhibitor** 3 Publications Verification	Cathepsin	Others
Cysteine Protease inhibitor is a **cysteine protease** inhibitor. Cysteine Protease inhibitor can be used in immunoblotting experiments of cells or tissues .

HY-128971

LHVS 3 Publications Verification	Cathepsin Parasite	Infection Neurological Disease
LHVS is a potent, non-selective, irreversible, cell-permeable **cysteine protease and cathepsin** inhibitor. LHVS decreases actin ring formation. LHVS inhibits T. gondii invasion with an IC₅₀ of 10 μM .

HY-155482

NA-184 1 Publications Verification	Proteasome	Neurological Disease
NA-184 is a selective and brain-penetrant calpain-2 inhibitor with an IC₅₀ of 134 nM for mouse calpain-2. NA-184 has weak inhibitory activity on calpain-1 (IC₅₀ of 2826 nM). NA-184 does not exhibit significant inhibition on a variety of other cysteine-, serine- or metallo-proteases. NA-184 shows significant neuroprotection and can be used for the study of traumatic brain injury (TBI) .

HY-161762

RA-0002034 RA-2034	CHIKV Virus Protease	Infection
RA-0002034 is a Chikungunya virus (CHIKV) nsP2 protease inhibitor with an IC₅₀ of 58 nM. RA-0002034 covalently modifies the catalytic cysteine in a site-specific manner .

HY-18234

Leupeptin	Ser/Thr Protease Virus Protease Cathepsin	Infection Inflammation/Immunology
Leupeptin is a broad-spectrum, membrane-permeable **protease inhibitor*. Leupeptin potently inhibits* serine, *cysteine* and threonine proteases. Leupeptin inhibits M ^pro (the main *protease* of SARS-CoV-2) and also has anti-inflammatory activity .

HY-129115

S1QEL1.1	Reactive Oxygen Species (ROS) Caspase	Others
S1QEL1.1 is a small molecule inhibitor that specifically inhibits the generation of superoxide and hydrogen peroxide at the IQ site during reverse electron transfer in mitochondrial respiratory chain complex I (Complex I), with an IC₅₀ of 0.07 μM. S1QEL1.1 can significantly reduce the activation of cysteine-aspartic protease (caspase) triggered by endoplasmic reticulum stress. S1QEL1.1 helps to decrease excessive proliferation of stem cells by inhibiting the Reactive Oxygen Species signaling pathway initiated by endoplasmic reticulum stress .

HY-100227

E 64c 3 Publications Verification	Cathepsin SARS-CoV	Metabolic Disease
E 64c is a derivative of naturally occurring epoxide inhibitor of **cysteine proteases*, a Calcium-activated neutral protease* (CANP) inhibitor and a very weak irreversible cathepsin C inhibitor. E 64c exhibits entry-blocking effect for MERS-CoV.

HY-141867

Z-FF-FMK Z-Phe-Phe-FMK	Cathepsin MEK Caspase DNA/RNA Synthesis Apoptosis	Cardiovascular Disease Neurological Disease
Z-FF-FMK (Z-Phe-Phe-FMK) is a cell-permeable, irreversible, and cysteine protease inhibitor targeting cathepsin-L. Z-FF-FMK inhibits angiotensin II-induced MEK activation in vascular walls, aortic medial remodeling, blood pressure elevation, and upregulation of cystatin C in aortic walls. Z-FF-FMK prevents β-amyloid-mediated caspase-3 activation, poly (ADP-ribose) polymerase cleavage, DNA fragmentation, and apoptosis of cortical neurons (apoptosis). Z-FF-FMK can be used in research related to hypertension and Alzheimer's disease .

HY-17541A

Cysteine Protease inhibitor hydrochloride 3 Publications Verification	Cholinesterase (ChE) Cathepsin	Neurological Disease
Cysteine Protease inhibitor hydrochloride, an inhibitor of **Cysteine Protease, binds to acetylcholinesterase (AChE*). Cysteine* Protease inhibitor hydrochloride is applicable to the research of Alzheimer's disease .

HY-112818

S130	Atg4 Cathepsin Autophagy Apoptosis	Cancer
S130 is a high affinity, selective inhibitor of ATG4B (a major cysteine protease) with an IC₅₀ of 3.24 µM. S130 suppresses autophagy flux .

HY-138084

SIC5-6	Separase Mitosis	Cancer
SIC5-6 is a potent Separase inhibitor. Separase, a large cysteine protease, involves in chromosome segregation during mitosis and meiosis, DNA damage repair, centrosome disengagement and duplication, spindle stabilization and elongation. Separase is highly overexpressed in many solid cancers, serves as an attractive chemotherapeutic target .

HY-156202

Geranylgeranoic acid	Histone Demethylase PD-1/PD-L1 Apoptosis	Cancer
Geranylgeranoic acid (Compound 5) is inhibits lysine-specific demethylase 1 (LSD1) with an IC₅₀ value of 46.97 µM. Geranylgeranoic acid induces apoptosis via loss of the mitochondrial membrane potential and activation of interleukin-1β-converting enzyme (ICE) and cysteine protease precursor 32 (CPP32) in Huh7 and PLC/PRF/5 human hepatoma cells and MLE-10 transformed mouse hepatocytes. Geranylgeranoic acid an isoprenoid with anticancer activity, which is found in S. chinensis .

HY-W790014

Z-FG-NHO-BzOME	Cathepsin	Infection
Z-FG-NHO-BzOME is a **cysteine protease** inhibitor that selectively inhibits cathepsin B, cathepsin L, cathepsin S, and papain .

HY-Y0241

2-Cyanopyrimidine	Cathepsin	Metabolic Disease
2-Cyanopyrimidine is a potent and non-selective cysteine protease cathepsin K inhibitor with an IC₅₀ of 170 nM. 2-Cyanopyrimidine is used for osteoporos .

HY-115753

Calpain Inhibitor-1	Proteasome	Neurological Disease
Calpain Inhibitor-1 (compound 36) is a potent and selective cysteine protease calpain 1 (Cal1) inhibitor (IC₅₀=100 nM; K_i=2.89 μM) .

HY-P5975

Z-Leu-Leu-Leu-fluoromethyl ketone Z-LLL-FMK	Cathepsin SARS-CoV	Infection
Z-Leu-Leu-Leu-fluoromethyl ketone (Z-LLL-FMK) is a **cysteine protease** inhibitor. Z-Leu-Leu-Leu-fluoromethyl ketone inhibits SARS infection. Z-Leu-Leu-Leu-fluoromethyl ketone also protects mice against a T. crassiceps challenge .

HY-119378

AK 295 CX 295	Proteasome Apoptosis	Infection Cardiovascular Disease Neurological Disease Inflammation/Immunology
AK 295 (CX 295) is a selective calpain inhibitor. AK 295 can inhibit apoptosis through a calpain-dependent pathway. AK 295 shows potent neuroprotective effect. AK 295 can inhibit the activity of the cysteine protease calpain and reduce myocardial injury. AK 295 can be used for the researches of infection, inflammation, cardiovascular and neurological disease, such as stroke and viral myocarditis .

HY-164634

CLIK-148	Cathepsin Cholecystokinin Receptor	Neurological Disease Metabolic Disease Cancer
CLIK-148 is a highly selective, irreversible and orally active **cysteine protease** inhibitor, primarily targeting Cathepsin L. CLIK-148 effectively inhibits the Cathepsin L-dependent degradation of HMG-CoA reductase in the endoplasmic reticulum (ER) membrane. CLIK-148 inhibits the processing of proCCK by Cathepsin L, thereby reducing the production of CCK8 (HY-P0093). CLIK-148 inhibits the degradation of type I collagen by osteoclasts' secreted Cathepsin L, reducing tumor-induced bone metastasis and malignant hypercalcemia. CLIK-148 can be used for the studies of bone metabolism disorders and regulation of neuropeptide processing .

HY-119293A

K777 tosylate	Cathepsin Cytochrome P450 Parasite SARS-CoV Filovirus	Infection Inflammation/Immunology Cancer
K777 tosylate is a potent, orally active and irreversible **cysteine protease** inhibitor. K777 tosylate is also a potent CYP3A4 inhibitor with an IC₅₀ of 60 nM. K777 tosylate irreversibly inhibits Cruzain, the major cysteine protease of Trypansoma cruzi, and cathepsins B and L. K777 tosylate is a broad-spectrum antiviral by targeting cathepsin-mediated cell entry. K777 tosylate inhibits SARS-CoV and EBOV pseudovirus entry with IC₅₀ values of 0.68 nM and 0.87 nM, respectively .

HY-155054

Cysteine protease inhibitor-3	Parasite	Infection
Cysteine protease inhibitor-3 (Compound 15) is a **Cysteine protease** inhibitor. Cysteine protease inhibitor-3 inhibits Pf3D7, PfW2, PfFP2 and PfFP3 with IC₅₀s of 0.74 μM, 1.05 μM, 3.5 μM, and 4.9 μM, respectively. Cysteine protease inhibitor-3 has anti-plasmodial efficacy against both drug-sensitive and drug-resistant parasites .

HY-P10871

cTEV6-2	Virus Protease	Infection
cTEV6-2 binds to the cysteine residue (C151) of tobacco etch virus protease (TEV protease), and covalently inhibits TEV protease with an IC₅₀ of 81.7 nM .

HY-175279

CHIKV nsP2 protease-IN-3	Virus Protease	Infection
CHIKV nsP2 protease-IN-3 (Compound 5) is an irreversible covalent inhibitor targeting the nonstructural protein 2 (nsP2) cysteine protease of chikungunya virus (CHIKV) (IC₅₀=0.5 μM). CHIKV nsP2 protease-IN-3 inhibits viral RNA replication. CHIKV nsP2 protease-IN-3 is promising for research of alphaviruses .

HY-18234AR

Leupeptin hemisulfate (Standard)	Reference Standards Cathepsin Ser/Thr Protease Virus Protease	Infection Inflammation/Immunology
Leupeptin (hemisulfate) (Standard) is the analytical standard of Leupeptin (hemisulfate). This product is intended for research and analytical applications. Leupeptin hemisulfate is a broad-spectrum, membrane-permeable protease inhibitor. Leupeptin hemisulfate potently inhibits serine, cysteine and threonine proteases. Leupeptin hemisulfate inhibits Mpro (the main protease of SARS-CoV-2) and also has anti-inflammatory activity[1][2][3].

HY-126973

BI-1230	HCV Protease	Infection
BI-1230, a chemical probe, is potent and digit nanomolar inhibitor of HCV NS3 protease and of viral replication. BI-1230 is also highly selective against other serine/cysteine proteases. BI-1230 shows good Pharmacokinetic(PK) activity .

HY-158763

MPI8 TG0205221	SARS-CoV Cathepsin Virus Protease	Infection
MPI8 (TG0205221) is an inhibitor of the major protease of SARS-CoV-2 (MPro) with high antiviral activity. MPI8 exerts its antiviral effect by dual and selective inhibition of SARS-CoV-2 MPro and host cell cysteine protease L (cathepsin L). MPI8 can be used in clinical studies of COVID-19 .

HY-100229R

Aloxistatin (Standard) E64d (Standard); E64c ethyl ester (Standard)	Reference Standards Cathepsin SARS-CoV	Neurological Disease
Aloxistatin (Standard) is the analytical standard of Aloxistatin. This product is intended for research and analytical applications. Aloxistatin (E64d) is a cell-permeable and irreversible broad-spectrum cysteine protease inhibitor. Aloxistatin (E64d) exhibits entry-blocking effect for MERS-CoV.

HY-158763A

MPI8 TFA TG0205221 TFA	SARS-CoV Cathepsin Virus Protease	Infection
MPI8 (TG0205221) TFA is an inhibitor of the major protease of SARS-CoV-2 (MPro) with high antiviral activity. MPI8 TFA exerts its antiviral effect by dual and selective inhibition of SARS-CoV-2 MPro and host cell cysteine protease L (cathepsin L). MPI8 TFA can be used in clinical studies of COVID-19 .

HY-P10828

MAPI	Virus Protease	Infection Inflammation/Immunology
MAPI is a polypeptide irreversible 3C cysteine protease (SV3CP) inhibitor. MAPI inhibits SV3CP by covalently binding its C-terminal Michael-acceptor extension to the active site thiol of SV3CP Cys 139. MAPI is promising for research of noroviruses infection .

HY-143714

Cathepsin K inhibitor 2	Cathepsin	Inflammation/Immunology
Cathepsin K inhibitor 2 is a potent inhibitor of cathepsin K. Cathepsin K, Cat K is a cysteine protease expressed under the control of CTSK gene and closely related to osteoporosis, whose main function is to hydrolyze collagen. Cathepsin K inhibitor 2 has the potential for the research of osteoarthfitis (extracted from patent WO2021147882A1, compound 78) .

HY-168050

SGC-NSP2PRO-1	CHIKV Virus Protease	Infection
SGC-NSP2PRO-1 is a potent irreversible covalent inhibitor of Chikungunya (CHIKV) nsP2 cysteine protease with an IC₅₀ value of 60 nM. SGC-NSP2PRO-1 demonstrates potent antialphavirus activity, inhibiting CHIKV and VEEV replication with EC₅₀ = 0.01 and 0.3 µM, respectively .

HY-118338

WRR-483	Parasite	Infection
WRR-483 is an analog of K11777, an inhibitor of cruzain, used to inhibit the proliferation of Trypanosoma cruzi in cell culture. WRR-483 can eradicate parasitic infection in an acute Chagas disease mouse model. WRR-483 is an irreversible cysteine protease inhibitor that shows pH-dependent high affinity and potent trypanocidal activity against cruzain and T. cruzi infection, and is expected to inhibit Chagas disease.

HY-108137A

Z-L(D-Val)G-CHN2	Cathepsin HSV SARS-CoV	Infection
Z-L(D-Val)G-CHN2 is the isoform of Z-LVG-CHN2 (HY-108137). Z-LVG-CHN2 is a cell-permeable and irreversible inhibitor of cysteine proteinase. Z-LVG-CHN2 is a tripeptide derivative and mimics part of the human cysteine proteinase-binding center. Z-LVG-CHN2 displays an inhibition on HSV whereas no significant effect on poliovirus replication. Z-LVG-CHN2 effectively blocks SARS-COV-2 replication (EC₅₀=190 nM) via inhibition of SARS-COV-2 3CL pro protease .

HY-18964G

MG-101 Calpain inhibitor I; Ac-LLnL-CHO; ALLN	Proteasome Apoptosis	Cancer
MG-101 (GMP) (Calpain inhibitor I (GMP)) is MG-101 (HY-18964) produced by using GMP guidelines. GMP small molecules works appropriately as an auxiliary reagent for cell therapy manufacture. MG-101 (ALLN) is an inhibitor of **cysteine proteases** which inhibits calpain I, calpain II, cathepsin B and cathepsin L with K_is of 190, 220, 150 and 500 pM, respectively. MG-101 induces apoptosis and inhibits tumor growth, it can be used for the research of colon cancer .

HY-172977

FGA139	Cathepsin NO Synthase TNF Receptor	Neurological Disease Inflammation/Immunology
FGA139 is a **cysteine proteases** inhibitor with IC₅₀ values of 4.98/3.14 μM for cathepsin B/L. FGA139 reduces LPS-induced NO production in RAW264.7 cells and tumor necrosis factor (TNFα) levels in microglia, and has anti-oxidative stress and anti-inflammatory activities. FGA139 promotes the secretion of neuroprotective metabolites purine and linoleic acid by LPS-stimulated microglia. FGA139 can be used in neuroinflammatory diseases research .

HY-146649

LmCPB-IN-1	Parasite Cathepsin	Infection
LmCPB-IN-1 (compound 35) is a potent and reversible covalent Leishmania mexicana cysteine protease B (LmCPB) inhibitor with a pK_i of 9.7 .

HY-161762A

(E/Z)-RA-0002034 (E/Z)-RA-2034	Influenza Virus CHIKV	Cancer
(E/Z)-RA-0002034 is a Chikungunya virus (CHIKV) nsP2 protease inhibitor with IC50 of 58 nM. RA-0002034 covalently modifies the catalytic cysteine in a site-specific manner.

HY-W014540

L-Proline tert-butyl ester hydrochloride tert-Butyl L-prolinate hydrochloride	Biochemical Assay Reagents
L-Proline tert-butyl ester hydrochloride (tert-Butyl L-prolinate hydrochloride) is a biologically active compound that has the activity of inhibiting cysteine and cathepsins, and is therefore widely used in the research and development of protease inhibitors. The characteristics of L-Proline tert-butyl ester hydrochloride make it of great significance in the field of biochemistry.

HY-170504

ZHAWOC25153	SARS-CoV Virus Protease	Infection
ZHAWOC25153 (Compound 17o) is a SARS-CoV-2 papain-like cysteine protease (PLpro) inhibitor, with an IC₅₀ of 7 μM. ZHAWOC25153 exhibits antiviral activity and can be used in research within the field of anti-infection .

Cat. No.	Product Name

HY-L926

Cysteine Protease Focused Covalent Library

2,113 compounds

Cysteine proteases (CPs), a key enzyme family regulating physiological metabolism and mediating pathological processes (e.g., abnormal bone resorption, tumour invasion, and pathogen infection), represent a core therapeutic target for disease intervention via the development of specific inhibitors. Currently reported CP covalent inhibitors encompass diverse structural types, including epoxides, aziridine, and activated double bonds (vinyl sulphones, α,β-unsaturated ketones), providing clear structural references for the development of novel CP covalent inhibitors.

This compound library contains multiple warheads that specifically target cysteine proteases, serving as a powerful tool for the efficient discovery of novel covalent inhibitors against this enzyme family.

HY-L925

Cysteine Protease Focused Library

9,188 compounds

Cysteine proteases (CPs), a key enzyme family regulating physiological metabolism and mediating pathological processes (such as abnormal bone resorption, tumour invasion, and pathogen infection), represent a core therapeutic target for developing specific inhibitors in disease intervention. Currently reported CP inhibitors primarily achieve their inhibitory function by precisely binding to CP active pockets (e.g., S1-S4 non-primed regions or S1'-S2' primed regions) and forming covalent/non-covalent interactions with the active site cysteine residues, providing clear structural references for the development of novel inhibitors.

This compound library, designed based on the core strategy of "similarity-based known active structures", contains over 200 cysteine protease inhibitors. Leveraging AI-driven molecular screening technology, it retains the critical pharmacological and shape features of reported CP inhibitors, serving as a specialized tool for efficiently discovering novel cysteine protease inhibitors.

HY-LD004

DEL Covalent Library

14 million compounds

DEL technology enables the simultaneous screening of millions or billions of compounds in a single tube by covalently linking each small molecule with a unique DNA sequence. Traditional DEL screening primarily focuses on identifying non-covalent binding molecules, where interactions with the target are reversible. In contrast, DNA‑encoded covalent library is an ultra‑high‑throughput screening library developed on the basis of conventional DNA‑encoded library technology. It incorporates controllable electrophilic covalent warheads capable of forming irreversible covalent bonds with amino acid residues at the active sites of target proteins, including Cys, Lys, Ser, Tyr, and others. This covalent binding enhances binding affinity, prolongs residence time at the target site, and has the potential to overcome challenges associated with traditional non-covalent inhibitors, such as drug resistance or off-target effects.

Each compound in the library contains both a binding domain and an electrophilic warhead. It first recognizes and binds to the target through non covalent interactions, and then forms a stable covalent bond with key amino acid residues to achieve irreversible inhibition. This library is specifically designed for the discovery of potent, long lasting, and highly selective covalent inhibitors, particularly for undruggable targets such as kinases, GPCRs, proteases, and mutant oncoproteins. Each molecule is uniquely labeled with a DNA barcode for molecular identification and sequencing decoding.

This library is an advanced and highly diverse collection, consists of 35 independent sub-libraries with a total scaleof 14 million compounds, It incorporates over 14 experimentally validated covalent warheads capable of targeting cysteine, lysine, arginine, aspartic acid and glutamic acid. This library is constructed with diverse drug like core scaffolds and integrated controllable covalent warheads, it features structural diversity, reaction spec

Cat. No.	Product Name	Type

HY-18964G

MG-101

Calpain inhibitor I; Ac-LLnL-CHO; ALLN

Fluorescent Dyes

MG-101 (GMP) (Calpain inhibitor I (GMP)) is MG-101 (HY-18964) produced by using GMP guidelines. GMP small molecules works appropriately as an auxiliary reagent for cell therapy manufacture. MG-101 (ALLN) is an inhibitor of cysteine proteases which inhibits calpain I, calpain II, cathepsin B and cathepsin L with K_is of 190, 220, 150 and 500 pM, respectively. MG-101 induces apoptosis and inhibits tumor growth, it can be used for the research of colon cancer .

Cat. No.	Product Name	Type

HY-18964G

MG-101

Calpain inhibitor I; Ac-LLnL-CHO; ALLN

Biochemical Assay Reagents

HY-W014540

L-Proline tert-butyl ester hydrochloride tert-Butyl L-prolinate hydrochloride	Biochemical Assay Reagents
L-Proline tert-butyl ester hydrochloride (tert-Butyl L-prolinate hydrochloride) is a biologically active compound that has the activity of inhibiting cysteine and cathepsins, and is therefore widely used in the research and development of protease inhibitors. The characteristics of L-Proline tert-butyl ester hydrochloride make it of great significance in the field of biochemistry.

Cat. No.	Product Name	Target	Research Area

HY-18234

Leupeptin	Ser/Thr Protease Virus Protease Cathepsin	Infection Inflammation/Immunology
Leupeptin is a broad-spectrum, membrane-permeable **protease inhibitor*. Leupeptin potently inhibits* serine, *cysteine* and threonine proteases. Leupeptin inhibits M ^pro (the main *protease* of SARS-CoV-2) and also has anti-inflammatory activity .

HY-141867

Z-FF-FMK Z-Phe-Phe-FMK	Cathepsin MEK Caspase DNA/RNA Synthesis Apoptosis	Cardiovascular Disease Neurological Disease
Z-FF-FMK (Z-Phe-Phe-FMK) is a cell-permeable, irreversible, and cysteine protease inhibitor targeting cathepsin-L. Z-FF-FMK inhibits angiotensin II-induced MEK activation in vascular walls, aortic medial remodeling, blood pressure elevation, and upregulation of cystatin C in aortic walls. Z-FF-FMK prevents β-amyloid-mediated caspase-3 activation, poly (ADP-ribose) polymerase cleavage, DNA fragmentation, and apoptosis of cortical neurons (apoptosis). Z-FF-FMK can be used in research related to hypertension and Alzheimer's disease .

HY-W790014

Z-FG-NHO-BzOME	Cathepsin	Infection
Z-FG-NHO-BzOME is a **cysteine protease** inhibitor that selectively inhibits cathepsin B, cathepsin L, cathepsin S, and papain .

HY-P5975

Z-Leu-Leu-Leu-fluoromethyl ketone Z-LLL-FMK	Cathepsin SARS-CoV	Infection
Z-Leu-Leu-Leu-fluoromethyl ketone (Z-LLL-FMK) is a **cysteine protease** inhibitor. Z-Leu-Leu-Leu-fluoromethyl ketone inhibits SARS infection. Z-Leu-Leu-Leu-fluoromethyl ketone also protects mice against a T. crassiceps challenge .

HY-P10871

cTEV6-2	Virus Protease	Infection
cTEV6-2 binds to the cysteine residue (C151) of tobacco etch virus protease (TEV protease), and covalently inhibits TEV protease with an IC₅₀ of 81.7 nM .

HY-P10828

MAPI	Virus Protease	Infection Inflammation/Immunology
MAPI is a polypeptide irreversible 3C cysteine protease (SV3CP) inhibitor. MAPI inhibits SV3CP by covalently binding its C-terminal Michael-acceptor extension to the active site thiol of SV3CP Cys 139. MAPI is promising for research of noroviruses infection .

HY-P11311

NC-002	Proteasome	Cancer
NC-002, a cell-permeable peptide, is a Trypsin-like proteasome inhibitor without inhibition of lysosomal cysteine proteases. NC-002 is the epoxyketone derivative of Leupeptin (HY-18234). NC-002 sensitizes myeloma cells to Bortezomib (HY-10227) and Carfilzomib (HY-10455). NC-002 can be used for cancers research .

HY-P5439

Epsilon-V1-2, Cys-conjugated	PKC MARCKS	Others
Epsilon-V1-2, Cys-conjugated is a biological active peptide. (This peptide is the εPKC specific inhibitor. Its inhibitory activity is based on εPKC translocation and MARCKS phosphorylation. This peptide interferes with εPKC interaction with the anchoring protein εRACK. This peptide contains a cysteine residue added to the C-terminus for potential S-S bond formation with a carrier protein.Pyroglutamyl (pGlu) peptides may spontaneously form when either Glutamine (Q) or Glutamic acid (E) is located at the sequence N-terminus. The conversion of Q or E to pGlu is a natural occurrence and in general it is believed that the hydrophobic γ-lactam ring of pGlu may play a role in peptide stability against gastrointestinal proteases. Pyroglutamyl peptides are therefore considered a normal subset of such peptides and are included as part of the peptide purity during HPLC analysis.)

Cat. No.	Product Name	Category	Target	Chemical Structure

HY-D0843

N-Ethylmaleimide 35+ Cited Publications NEM	Microorganisms Source Classification	Cathepsin Deubiquitinase Apoptosis
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 .

HY-18234A

Leupeptin hemisulfate 60+ Cited Publications	Natural Products Microorganisms Classification of Application Fields Inflammation/Immunology Disease Research Fields Source Classification	Cathepsin Ser/Thr Protease Virus Protease
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 .

HY-18234AR

Leupeptin hemisulfate (Standard)	Structural Classification Natural Products Microorganisms Source Classification	Reference Standards Cathepsin Ser/Thr Protease Virus Protease
Leupeptin (hemisulfate) (Standard) is the analytical standard of Leupeptin (hemisulfate). This product is intended for research and analytical applications. Leupeptin hemisulfate is a broad-spectrum, membrane-permeable protease inhibitor. Leupeptin hemisulfate potently inhibits serine, cysteine and threonine proteases. Leupeptin hemisulfate inhibits Mpro (the main protease of SARS-CoV-2) and also has anti-inflammatory activity[1][2][3].

Cat. No.	Product Name	Chemical Structure

HY-D0843S

N-Ethylmaleimide-d5
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 .

Targets Recommended: Calpain Virus Protease ASCT HCV Protease HIV Protease Protease Activated Receptor (PAR) ClpP TMPRSS6 Serpin Enteropeptidase Ser/Thr Protease

Cat. No.	Product Name	Target	Research Areas	Chemical Structure

HY-18964G

MG-101 Calpain inhibitor I; Ac-LLnL-CHO; ALLN	Proteasome Apoptosis	Cancer
MG-101 (GMP) (Calpain inhibitor I (GMP)) is MG-101 (HY-18964) produced by using GMP guidelines. GMP small molecules works appropriately as an auxiliary reagent for cell therapy manufacture. MG-101 (ALLN) is an inhibitor of **cysteine proteases** which inhibits calpain I, calpain II, cathepsin B and cathepsin L with K_is of 190, 220, 150 and 500 pM, respectively. MG-101 induces apoptosis and inhibits tumor growth, it can be used for the research of colon cancer .

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Cysteine Protease inhibitor

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