brd2/brd4

PROTAC BRD2/BRD4 degrader-1 (compound 15) is a potent, selective degrader of BET proteins BRD4 and BRD2, achieving rapid, reversible, and unexpectedly selective elimination compared to BRD3. It effectively suppresses solid tumors with minimal cytotoxic effects and comprises a BET inhibitor, a connecting linker, and thalidomide as the ligand for cereblon (CRBN)/cullin 4A[1].

BET-IN-6, a ligand with potent and high affinity for inhibiting BRD2/BRD4, plays a crucial role in the synthesis of PROTAC BRD2/BRD4 degrader-1 [1], targeting the protein BRD2/4.

BY27, a potent and selective BET BD2 inhibitor (Ki: 3.1 nM) with anticancer activity, inhibits BD1/BD2 of BRD2, BRD3, BRD4, and BRDT, and suppresses tumor growth.

CF53 is a highly potent, selective, and orally active inhibitor of BET protein, with a Ki of <1 nM, Kd of 2.2 nM, and an IC50 of 2 nM for BRD4 BD1. CF53 binds to both the BD1 and BD2 domains of BRD2, BRD3, BRD4, and BRDT BET proteins with high affinities, being very selective over non-BET bromodomain-containing proteins. CF53 exhibits potent anti-tumor activity both in vitro and in vivo.

BETd-260, a PROTAC linked by a Cereblon ligand and a BET ligand, has an inhibitory effect on BRD4 protein in leukemic cell lines.

NHWD-870 is an effective and selective inhibitor of BET family bromodomain only binding to BRD2, BRD3, BRD4 (IC50 = 2.7 nM), and BRDT. NHWD-870 exhibits potent anti-tumor efficacies and suppresses cancer cell-macrophage interaction through the increase of tumor apoptosis and inhibition of tumor proliferation.

ABBV-744 is a BDII-selective BET bromodomain inhibitor that inhibits BRD2/3/4. It is used in the research on inflammatory diseases, cancer, and AIDS.

RVX-297 is a BD2 selective inhibitor of BET bromodomains. RVX-297 preferentially binds to the BD2 domains of the BET bromodomain and Extra Terminal (BET) family of protein.

BRD4 Inhibitor-20 is a potent bromodomain protein 4 (BRD4) inhibitor with oral activity, demonstrating antiproliferative effects in cancer cell lines and used in studies of various cancers, including colon cancer.

MS402 is a novel BD1-selective BET BrD inhibitor.

BAY1238097, a potent and selective bromodomain and extra-terminal motif (BET) inhibitor with anticancer activity, exhibits strong antiproliferative effects in AML (Acute Myeloid Leukemia) and MM (Multiple Myeloma) models. BAY1238097 is useful for studying advanced refractory malignancies.

GS-626510 is an orally bioavailable inhibitor of BET family bromodomains (Kd: 0.59-3.2 nM for BRD2/3/4; IC50: 83 nM and 78 nM for BD1 and BD2).

HJB97 is used for the design of potential PROTAC BET degrader. It also has antitumor activity. HJB97 is a high-affinity inhibitor of BET (Kis: 0.9 nM (BRD2 BD1), 0.27 nM (BRD2 BD2), 0.18 nM (BRD3 BD1), 0.21 nM (BRD3 BD2), 0.5 nM (BRD4 BD1), 1.0 nM (BRD4 BD2), respectively).

KB02-JQ1 is a potent and specific proteolysis targeting chimera (PROTAC) that specifically degrades BRD4, acting as a molecular glue. It does not degrade BRD2 or BRD3. The mechanism of action involves covalent modification of the E3 ligase DCAF16, thereby promoting BRD4 degradation. Importantly, KB02-JQ1 demonstrates enhanced stability and durability in facilitating protein degradation within biological systems. The compound forms a complex with the ubiquitin E3 ligase ligand KB02 through a linker, resulting in the formation of KB02-JQ1[1].

MS436 is a selective, small-molecule inhibitor for the BRD4 bromodomains.

Thalidomide-NH-C4-NH2 TFA (compound 29c) is a conjugate composed of an E3 ligase ligand-linker that integrates a Thalidomide-based cereblon ligand and a linker moiety. This compound is used as a component in PROTAC BRD2/BRD4 degrader-1, a highly potent and selective degrader targeting BET proteins BRD4 and BRD2[1].

XD14 is an inhibitor of BET bromodomain (Kd of 160 nM, 170 nM, 380 nM, 490 nM, 830 nM and 850 nM for BRD4(1), BRD2(1), BRD3(1), BRD3(2), BRD2(2) and BRD4(2), respectively).

PARP1/BRD4-IN-3 (compound HF4) is an effective inhibitor of BRD4 and PARP1, with IC50 values of 1210 nM and 2019 nM respectively. The compound exhibits antiproliferative activity, induces apoptosis (apoptosis) and cell cycle arrest at the G0/G1 phase. Additionally, PARP1/BRD4-IN-3 causes DNA damage and reduces the expression of the Rad51 protein, demonstrating anti-tumor activity.

SJ46421, a PROTAC protein degrader derived from (+)-JQ-1, targets KLHDC2. It efficiently forms a stable ternary complex with KLHDC2, exhibiting an IC50 of 7.8 nM. Furthermore, SJ46421 promotes the polyubiquitination of the BD2 domain of BRD2, BRD3, or BRD4.

SJ46420, a potent and selective precursor variant of SJ46421, functions as a BRD3 PROTAC degrader through a KLHDC2-dependent mechanism. This compound specifically degrades BRD3, which concurrently results in the partial reduction of BRD2 or BRD4 levels.

BET-IN-27 (compound 6C) is an orally active BET inhibitor with IC50 values of 3.3 nM (BRD4-BD2), 3.4 nM (BRD4-BD1), 4.1 nM (BRD2-BD1), 20.4 nM (BRD3-BD1), and 42.0 nM (BRDT-BD1). It also exhibits antiproliferative activity.

RVX-2135 is a BET inhibitor specifically targeting BRD2, BRD3, and BRD4.

AB3067 is a PROTAC degrader targeting BET protein, efficiently recruiting two distinct E3 ligases, Cereblon and VHL, with strong affinity (demonstrated by IC50 values of 559 nM for VHL and 190 nM for CRBN in vivo HEK293). It degrades BRD2, BRD3, BRD4, and CRBN with DC50 values of 2.1~2.3, 1.6, 15, and 75 nM, respectively. Additionally, AB3067 inhibits the proliferation of RKO cells, with an EC50 of 111 nM. (Pink: ligand for target protein; Black: linker; Blue: ligand for E3 ligase VHL and CRBN)

XY221 (Compound 16o) selectively inhibits BRD4 BD2 with an IC50 of 5.8 nM. It demonstrates high selectivity for pan-BD2 and BRD4 BD2 domains, being 667 times more selective than for BRD4 BD1, and 9-32 times more selective than for BRD2/3/T BD2. XY221 can induce apoptosis in MV4-11 cells and exhibits anti-cancer activity.