BETbromodomaininhibitor 1 is an orally active, selective inhibitor of bromodomain and extra-terminal (BET) proteins. It specifically inhibits BRD4 with an IC50 of 2.6 nM. Additionally, BETbromodomaininhibitor 1 demonstrates high affinities towards BRD2(2), BRD3(2), BRD4(1), BRD4(2), and BRDT(2) with Kd values of 1.3 nM, 1.0 nM, 3.0 nM, 1.6 nM, and 2.1 nM, respectively. This compound exhibits anti-cancer activity.
RX-37 is a potent BETinhibitor with Ki values of 3.2-24.7 nM for BRD2, BRD3 and BRD4. RX-37 demonstrates high selectivity over other non-BETbromodomain-containing proteins. RX-37 potently and selectively inhibits cell growth in human acute leukemia cell
TW9 is a dual inhibitor of bromodomain 2 (BD2) in bromodomain-containing protein 4 (BRD4) and histone deacetylase 1 (HDAC1; IC50s = 0.074 and 0.29 μM, respectively).1It is selective for BD2 over BD1 in BRD4 (IC50= 0.72 μM) and for HDAC1 over HDAC2 (IC50= 2.5 μM). TW9 (50 nM) induces apoptosis in, and inhibits proliferation of, MIA PaCa-2 pancreatic cancer cells. It induces cell cycle arrest at the G1phase in HPAC pancreatic cancer cells when used at a concentration of 2 μM. TW9 acts synergistically with gemcitabine to reduce the viability of HPAC cells. 1.Zhang, X., Zegar, T., Weiser, T., et al.Characterization of a dual BET HDAC inhibitor for treatment of pancreatic ductal adenocarcinomaInt. J. Cancer147(10)2847-2861(2020)
EN219 is a synthetic recruiter of the E3 ubiquitin ligase RNF114.1It binds to cysteine 8 (C8) in the intrinsically disordered region of RNF114 (RNF114-C8; IC50= 470 nM) and inhibits RNF114-induced autoubiquitination and p21 ubiquitination in a cell-free assay when used at a concentration of 50 μM. EN219 (1 μM) also interacts with cysteine residues in the tubulin β1 chain (TUBB1), heat shock protein 60 (Hsp60), also known as Hsp family D member 1 (HspD1), and histone H3.1 (HIST1H3A) in 231MFP human breast cancer cells in a proteomic profiling assay. It has been linked to the bromodomain and extra terminal domain (BET) inhibitor ligand (+)-JQ1 for use as a proteolysis-targeting chimera (PROTAC) to degrade bromodomain-containing protein 4 (BRD4) in 231MFP cells. 1.Luo, M., Spradlin, J.N., Boike, L., et al.Chemoproteomics-enabled discovery of covalent RNF114-based degraders that mimic natural product functionCell Chem. Biol.28(4)559-566(2021)
GSK097 is a highly potent and selective inhibitor of the second bromodomain (BD2) found in bromodomain and extra-terminal domain (BET) proteins. It exhibits a remarkable 2000-fold selectivity for BD2 over BD1, as indicated by BRD4 data. Additionally, GSK097 demonstrates solubility of over 1 mg mL in FaSSIF media.
(+)-JQ-1 carboxylic acid is a potent bromodomain and extra terminal domain (BET) inhibitor. (+)-JQ-1 carboxylic has potential to be used as a precursor to synthesize PROTACs and other conjugates.