HSP90 Inhibitor

YK5 is a potent and selective Hsp70 inhibitor. YK5 selectively and tightly binds to the cytosolic Hsp70s in cancer cells. YK5 has biological activity partly by interfering with the formation of active oncogenic Hsp70/Hsp90/client protein complexes.

Conglobatin (FW-04-806), a macrolide dilactone, is isolated from the culture of Streptomyces conglobatus. Conglobatin is an orally active Hsp90 inhibitor. Conglobatin can bind to the N-terminal domain of Hsp90 and disrupt Hsp90-Cdc37 complex formation. Conglobatin induces apoptosis in human breast cancer cells and esophageal squamous cell carcinoma cells, and exhibits antitumor activity in vivo.

Gedunin is a limonoid with anti-cancer, anti-viral, anti-inflammatory and insecticidal activities. Gedunin acts as a potent Hsp90 inhibitor and induces the degradation of Hsp90-dependent client proteins. Geduni may obstructs the entry of SARS-CoV-2 virus into human host cells and can be used for COVID-19 research.

Gamendazole, an indazole carboxylic acid (ICA), is an orally active, selective HSP90AB1 (HSP90BETA) and EEF1A1 (eEF1A) inhibitor. Gamendazole binds to the C-terminal nucleotide binding pocket of HSP90 and cause downregulation of clients AKT1 and ERBB2, but stabilizes the HSP90 heterocomplex. Gamendazole specifically inhibits the actin bundling function of EEF1A1, but does not bind to the nucleotide docking pocket nor inhibits the ribosome charging or protein translation functions of EEF1A1. Gamendazole, an antispermatogenic compound with antifertility effects, has the potential for reversible non-hormonal male contraceptive agent research.

HEMTAC WEE1 degrader-1 is a HSP90-mediated targeting chimera (HEMTAC) degrader of WEE1 (HSP90 enzyme inhibitory activity is IC₅₀: 16.76 nM). HEMTAC WEE1 degrader-1 promotes the ubiquitination and degradation of WEE1. HEMTAC WEE1 degrader-1 blocks the G2/M cell cycle. HEMTAC WEE1 degrader-1 has anticancer activity in acute myeloid leukemia (AML) patient-derived xenograft (PDX) models. HEMTAC WEE1 degrader-1 can be used in AML research. (Pink: HSP90 binder; Blue: WEE1 ligand; Black: linker).

CH5138303 is a potent and orally active Hsp90 inhibitor. CH5138303 shows high binding affinity for N-terminal Hsp90α, with K_d of 0.52 nM. CH5138303 shows potent anti-proliferative activity against human cancer cell lines (HCT116 and NCI-N87), with IC₅₀ values of 0.098 and 0.066 μM, respectively. CH5138303 shows high oral bioavailability in mice (F=44.0%). CH5138303 shows potent antitumor efficacy in a human NCI-N87 gastric cancer xenograft model.

HS-27, a fluorescently-tethered Hsp90 inhibitor, assays surface Hsp90 expression on intact tissue specimens. HS-27 is made up of the core elements of SNX-5422, an Hsp90 inhibitor, tethered via a PEG linker to a fluorescein derivative (fluorescein isothiocyanate or FITC), that binds to ectopically expressed Hsp90. HS-27 has potential use in a see-and-treat paradigm in breast cancer.

YZ129 is an inhibitor of the HSP90-calcineurin-NFAT pathway against glioblastoma, directly binding to heat shock protein 90 (HSP90) with an IC₅₀ of 820 nM on NFAT nuclear translocation. YZ129-induced GBM cell-cycle arrest at the G2/M phase promotes apoptosis and inhibited tumor cell proliferation and migration.

XYD049 is a CRBN-based molecular glue degrader targeting GSPT1, with a DC₅₀ of 19 nM. XYD049 mediates the formation of a ternary complex between CRBN and GSPT1, thereby triggering CRBN- and proteasome-dependent degradation of GSPT1. By degrading GSPT1, XYD049 downregulates castration-resistant prostate cancer (CRPC)-related oncogenes, including BCL2, CDK2, E2F3, EGFR, HSP90B1, TMPRSS2, AR, AR-V7, PSA and c-Myc. XYD049 inhibits cancer cell growth and suppresses tumor growth in mice. XYD049 can be used for research on castration-resistant prostate cancer. XYD049 consists of a linker (black part) NH2-C5-NH-Boc (HY-W004710), a CRBN-based E3 ligase ligand (blue part) Thalidomide 4-fluoride (HY-41547), and a target protein ligand (red part) GSPT1 ligand-1 (HY-170821), among which the E3 ligase ligand plus linker forms the conjugate E3 Ligase Ligand-linker Conjugate 158 (HY-170822).

Zelavespib formic (PU-H71 formic) is a potent Hsp90 inhibitor with an IC₅₀ value of 51 nM for Hsp90 in MDA-MB-468 cells.

Gamitrinib TPP is a Gamitrinib (GA) mitochondrial matrix inhibitor. Gamitrinib TPP is a mitochondrial targeted HSP90 inhibitor with anti-cancer activity.

DDO-6600 is a covalent Hsp90 inhibitor. DDO-6600 disrupts the interaction between Hsp90 and its co-chaperone protein Cdc37, thereby inducing the degradation of kinase client proteins (such as AKT, CDK4, c-Raf). DDO-6600 has inhibitory activity against various cancer cells. DDO-6600 inhibits the migration and invasion of HCT-116 cells, and induces cell cycle arrest and apoptosis. DDO-6600 significantly inhibits tumor growth in the HCT-116 xenograft tumor model. DDO-6600 can be used for research on colorectal cancer.

KU-177 is a potent inhibitor of Hsp90 ATPase homologue 1 (Aha1), ablates Aha1-driven enhancement of Hsp90-dependent tau aggregation. KU-177 also disrupts Aha1/Hsp90 interactions (IC₅₀=4.08 μM) without inhibition of Hsp90’s ATPase activity. KU-177 can be used for tauopathies research.

Aminohexylgeldanamycin (AHGDM), a Geldanamycin derivative, is a potent HSP90 inhibitor. Aminohexylgeldanamycin shows antiangiogenic and antitumor activities.

SNX-5422 Mesylate (PF-04929113 Mesylate), a prodrug of SNX-2112, is an orally active Hsp90 inhibitor, with a K_d of 41 nM, and also induces Her-2 degradation, with an IC₅₀ of 37 nM.

CH5015765 is an orally available Hsp90 inhibitor bound to the N-terminal ATP binding site, with a dissociation constant of 3.4 nM, CH5015765 exerts antiproliferative activity against human cancer cell lines, with IC₅₀ values of 0.46 μM for HCT116 colorectal cancer cells and 0.57 μM for NCI-N87 gastric cancer cells. CH5015765 can be used for the study of cancer.

HSP90/mTOR-IN-1 is a potent and orally active Hsp90 and mTOR inhibitor with IC₅₀ values of 69 nM and 29 nM, respectively. HSP90/mTOR-IN-1 suppresses the proliferation of SW780 cells through the over-activation of the PI3K/AKT/mTOR pathway. HSP90/mTOR-IN-1 induces apoptosis and autophagy via selective Hsp90 and mTOR inhibition. HSP90/mTOR-IN-1 also has considerable in vivo anti-tumor activity. HSP90/mTOR-IN-1 can be used for researching bladder cancer.

Onalespib lactate is a potent and cross the blood-brain barrier heat-shock-protein-90 (Hsp90) inhibitor with an K_d value of 0.71 nM. Onalespib lactate inhibits the proliferation, survival and migration. Onalespib lactate decreases the expression of EGFR, p-EGFR, AKT, P-AKT, ERK1/2, P-ERK1/2, S6, P-S6 protein. Onalespib lactate shows antitumor activity. Onalespib lactate has the potential for the research of non-small cell lung cancer (NSCLC).

SNX-7081 is an Hsp90 inhibitor with K_i and IC₅₀ values of 26 nM and 44 nM, respectively. SNX-7081 blocks the nuclear translocation of NF-κB, inhibits the production of pro-inflammatory cytokines, attenuates the ERK/JNK and PDGF signaling pathways, and suppresses LPS (HY-D1056)-induced nitric oxide production. SNX-7081 inhibits DNA repair, induces G₂/M cell cycle arrest, and triggers apoptosis via downregulation of MYC/nucleolin and activation of Fas. SNX-7081 can be used in research related to rheumatoid arthritis and cancer.

KUNG94 is a selective Grp94/HSP90B inhibitor (IC₅₀=8 nM). By inhibiting the chaperone function of Grp94, KUNG94 reduces the maturation and cell surface trafficking of its specific client proteins. KUNG94 can be used for studies on Grp94-related biological mechanisms, as well as diseases including cancer and primary open-angle glaucoma.