E1/E2/E3 Enzyme Inhibitor

Anti-Mouse RANKL/CD254 Antibody (IK22/5) is an anti-mouse RANKL/CD254 IgG2a monoclonal antibody. Anti-Mouse RANKL/CD254 Antibody (IK22/5) inhibits osteoclast formation and activity by specifically blocking the binding of RANKL and RANK. Anti-Mouse RANKL/CD254 Antibody (IK22/5) can inhibit the expression of MuRF1/Trogin-1 and activation of NF-κB. Anti-Mouse RANKL/CD254 Antibody (IK22/5) can be used for research on cancer such as melanoma or colon cancer and osteoporosis.

DI-591 is a potent, high-affinity and cell-permeable inhibitor of the DCN1-UBC12 interaction. DI-591 binds to DCN1 and DCN2 with K_i values of 12 nM and 10.4 nM, respectively and has no appreciable binding to DCN3, DCN4, and DCN5 proteins. DI-591 selectively inhibits neddylation of cullin 3 but has no or minimal effect on neddylation of other cullin family members.

Cbl-b-IN-1 (Example 519) is an inhibitor of Cbl-b, with an IC₅₀ of less than 100 nM. Cbl-b-IN-1 can promote the secretion of cytokines such as IL-2, IFN-γ, and TNF-α, facilitate T cell activation, and enhance the TCR signaling pathway. Cbl-b-IN-1 can be used in research on immunomodulation.

VHL-IN-1 (Compound 30) is an E3 ligase VHL inhibitor with a K_d value of 37 nM. VHL-IN-1 blocks VHL-mediated ubiquitination and degradation of HIF-1α. VHL-IN-1 stabilizes the protein levels of HIF-1α and hydroxylated HIF-1α, and induces the transcriptional activity of HIF-1α. VHL-IN-1 can be used for PROTAC development. VHL-IN-1 is applicable for cancer research.

BI8626 is a specific inhibitor of the ubiquitin ligase HUWE1 with an IC₅₀ of 0.9 μM.

Ubiquitination-IN-1 (compound 24) is a ubiquitination and Cksl-Skp2 protein-protein interaction (IC₅₀=0.17 μM) inhibitor. Ubiquitination-IN-1 increases levels of p27. Ubiquitination-IN-1 has the potential for treatment disease by blocking the degradation of tumor suppressors.

1-Benzyl-I3C is a NEDD4-1 inhibitor with significant anticancer activity. 1-Benzyl-I3C can directly inhibit the ubiquitination activity of NEDD4-1 with an IC50 of 12.3μM, which is significantly better than its precursor compound I3C of 284μM. 1-Benzyl-I3C and its analogs showed good effects in inhibiting the proliferation of human melanoma cells, which is roughly related to their potency as NEDD4-1 enzyme inhibitors. By combining in vitro ubiquitination experiments and thermal stability analysis, 1-Benzyl-I3C was shown to be able to bind to the catalytic HECT domain of NEDD4-1.

Streptonigrin (Bruneomycin) is an orally active antibiotic and pan-PAD inhibitor, inhibiting PAD1, PAD2, PAD3 and PAD4 with IC₅₀ of 48.3 μM, 26.1 μM, 0.43 μM and 2.5 μM, respectively. Streptonigrin inhibits SENP1 (IC₅₀ of 0.518 μM) and reduces HIF1α. Streptonigrin increases p53 and Apoptosis. Streptonigrin shows antiviral activity against Rauscher murine leukemia virus. Streptonigrin has immunosuppressive effects. Streptonigrin has antitumor activity against osteosarcoma.

UBA5-IN-1 (compound 8.5) is a selective UBA5 inhibitor with an IC₅₀ value of 4.0 μM. UBA5-IN-1 inhibits cell proliferation of Sk-Luci6 cancer cells with high expression levels of UBA5.

MX69 is an inhibitor of MDM2/XIAP, used for cancer treatment.

Nutlin-3b, the inactive form of Nutlin-3 (HY-50696), is a p53/MDM2 inhibitor with an IC₅₀ of 13.6 μM. Nutlin-3b is 150 times less potent in binding to MDM2 than Nutlin-3a (HY-10029). Nutlin-3b is promising for research of cancers.

CC0651 is an allosteric inhibitor of the human Cdc34 ubiquitin-conjugating enzyme. CC0651 potently (IC₅₀=1.72 μM) inhibits the ubiquitination of p27^Kip1, as confirmed by dose-response analysis.

PYZD-4409 is a specific inhibitor of the ubiquitin-activating enzyme UBA1 with an IC₅₀ of 20 μM (cell-free enzymatic assay). PYZD-4409 induces cell death in malignant cells and preferentially inhibits the clonogenic growth of primary acute myeloid leukemia cells.

SMIP004 is a SKP2 E3 ligase inhibitor, which downregulates SKP2 and to stabilise p27. SMIP004 is a cancer cell selective apoptosis inducer of human prostate cancer cells.

EN106 is a potent inhibitor of FEMIB. EN106 is a cysteine-reactive covalent ligand. EN106 disrupts recognition of the key reductive stress substrate of FEM1B, FNIP1. EN106 reduces oxidative stress and rescues high glucose-induced impaired angiogenesis in HUVECs.

SAR405838 (MI-77301), an analog of MI-773, is a highly potent and selective MDM2-p53 interaction inhibitor. SAR405838 binds to MDM2 with a K_i of 0.88 nM. SAR405838 induces apoptosis and has potent antitumor activity.

NAcM-OPT is an orally bioavailable cullin neddylation 1 (DCN1) inhibitor, which potently inhibits the DCN1-UBE2M interaction.

Vialinin A (Terrestrin A) is a p-terphenyl compound that can be derived from a Chinese edible mushroom. Vialinin A is an inhibitor of ubiquitin-specific peptidase 4 (USP4) and has anti-inflammatory and antioxidant properties. Vialinin A can alleviate cerebral ischaemia-reperfusion injury-induced neurological deficits and neuronal apoptosis. Vialinin A promotes activation of Keap1-Nrf2-ARE signaling pathway and increases the protein degradation of Keap1. Vialinin A possesses various pharmacological activities in cancer, Kawasaki disease, asthma, and pathological scarring. Vialinin A is a potent inhibitor of TNF-α, USP4, USP5, and sentrin/SUMO-specific protease 1 (SENP1). Vialinin A can be studied in reseach for autoimmune diseases, cancer and ischaemic stroke.

KH-4-43 is an inhibitor of E3 CRL4. KH-4-43 inhibits E3 CRL4's core ligase complex and exhibits anticancer activity. KH-4-43 has a binding K_d to E3 ROC1-CUL4A CTD or the highly related ROC1-CUL1 CTD at 83 nM or 9.4 μM, respectively.

SCFSkp2-IN-2 (Compound AAA-237) is a Skp2 inhibitor with a K_D of 28.77 μM. AAA-237 induces apoptosis of NSCLC cells and shows antitumor activities.