bromodomain inhibitor-8

Bromodomain inhibitor-8 is an inhibitor of BET bromodomain used to treat autoimmune and inflammatory diseases.

PBRM1-BD2-IN-8 (compound 34) is a potent PBRM1 Bromodomain inhibitor with PBRM1-BD2 Kd of 4.4 μM, PBRM1-BD2 IC50 of 0.16 μM, and PBRM1-BD5 Kd of 25 μM; PBRM1-BD2-IN-8 shows anti-cancer activity.

BAY-299 is an effecitve inhibitor of the bromodomain and PHD finger family member BRPF2 and the TATA box binding protein-associated factors TAF1 and TAF1L with IC50s of 67 nM, 8 nM, and 106 nM, respectively.

EN219 is a synthetic recruiter of the E3 ubiquitin ligase RNF114 and binds specifically to cysteine 8 (C8) within its intrinsically disordered region, exhibiting an IC50 of 470 nM. EN219 inhibits RNF114-induced autoubiquitination and p21 ubiquitination in cell-free assays at 50 μM. At 1 μM, EN219 interacts with multiple proteins including the tubulin β1 chain (TUBB1), heat shock protein 60 (Hsp60/HspD1), and histone H3.1 (HIST1H3A) in 231MFP breast cancer cells. Furthermore, EN219 has been linked to the bromodomain inhibitor (+)-JQ1 for the creation of a PROTAC capable of degrading BRD4 in 231MFP cells.

CAY17c is an inhibitor of bromodomain-containing protein 4 (BRD4; IC50= 0.71 μM), as well as class I histone deacetylases (HDACs; IC50s = 0.046, 0.058, 0.075, and 0.167 μM for HDAC1, -2, -3, and -8, respectively) and class IIb HDACs (IC50s = 0.073 and 0.923 μM for HDAC6 and HDAC10, respectively).1It is selective for these enzymes over BRD2, -3, and -T (IC50s = >20 μM for all), as well as over HDAC4, -5, -7, -9, and -11 (IC50s = >10 μM for all). CAY17c inhibits the proliferation of HCT116, SW620, and DLD-1 colorectal cancer cells (IC50s = 0.45, 1.78, and 2.11 μM, respectively), as well as induces apoptosis and autophagy in HCT116 cells. It reduces tumor growth in an HCT116 mouse xenograft model when administered at doses of 15 and 30 mg/kg. 1.Pan, Z., Li, X., Wang, Y., et al.Discovery of thieno[2,3-d]pyrimidine-based hydroxamic acid derivatives as bromodomain-containing protein 4/histone deacetylase dual inhibitors induce autophagic cell death in colorectal carcinoma cellsJ. Med. Chem.63(7)3678-3700(2020)

HDAC6/8/BRPF1-IN-1 is a dual inhibitor targeting HDAC6, HDAC8, and the bromodomain and PHD finger containing protein 1 (BRPF1). It exhibits inhibitory activity against HDAC1, HDAC6, and HDAC8 with IC50 values of 797 nM, 344 nM, and 908 nM, respectively, and inhibits BRPF1 with a Kd value of 175.2 nM. This compound is utilized in cancer research [1].

I-BET282E is a pan-inhibitor of eight BET bromodomains and shows selectivity for other representative bromodomain-containing proteins. It can act on eight BRD2 (BD1/BD2), BRD2 (BD1/BD), BRD3 (BD1/BD), and BRD4 (BD1/BD), with their pIC50 values ranging from 6.4 to 7.7.

IACS-9571 (trifluoroacetate) serves as an inhibitor of the bromodomain proteins TRIM24 and BRPF1, exhibiting an IC50 of 8 nM and a Kd of 31 nM against TRIM24, and a Kd of 14 nM against BRPF1.