Btk Degrader

DFCI-002-06 is an orally active dual-target HCK/BTK PROTAC degrader with DC₅₀ values for HCK and BTK of 1.3 and 4.5 nM respectively. DFCI-002-06 retains higher anti-tumor activity than the HCK/BTK dual-target inhibitor (HY-15805), inducing apoptosis in cancer cells. DFCI-002-06 can be used for the study of MYD88 mutant B-cell malignancies.

Bexobrutideg (NX-5948) is an orally active chimeric targeting molecule (CTM) that induces specific BTK protein degradation by the cereblon E3 ligase (CRBN) complex without degradation of other cereblon neo-substrates. Bexobrutideg mediates potent anti-inflammatory activity via BTK degradation with resultant inhibition of B cell activation. Bexobrutideg exhibits potent tumor growth inhibition in TMD8 xenograft models that contain either wild-type BTK or BTKi-resistant mutations. Bexobrutideg is efficacious in a mouse collageninduced arthritis (CIA) model. Bexobrutideg can cross the blood brain barrier (BBB). Bexobrutideg is a PROTAC composed of the ligand for target protein, a linker, and a cereblon E3 ligase (CRBN) complex (Red: BTK ligand (HY-170324); Blue: CRBN ligand (HY-171893); Black: linker).

BGB-16673 (BGB-16673) is an orally active, selective BTK PROTAC degrader (IC₅₀=0.69 nM). BGB-16673 ligates BTK to E3 ubiquitin ligase, causing BTK to undergo polyubiquitination, which is then recognized and degraded by the proteasome, thereby exerting efficient BTK degradation activity. BGB-16673 can be used in the research of B-cell malignancies such as chronic lymphocytic leukemia, small lymphocytic lymphoma, and mantle cell lymphoma.

MT-802 is a BTK PROTAC degrader. MT-802 degrades wild-type BTK (DC₅₀ = 14.6 nM) and BTK mutants including E41K, C481S (DC₅₀ = 14.9 nM), C481R, C481Y, C481T, C481F, L528W, and inhibits their Y223 phosphorylation. BI-4732 can be used for the study of Ibrutinib (HY-10997)-resistant chronic lymphocytic leukemia (CLL). (Pink: BTK ligand (HY-150885), Blue: CRBN Ligand (HY-14658), Black: Linker (HY-141371), E3 ligase ligand-linker conjugate (HY-176340)).

GBD-9 is a degrader based on the E3 ubiquitin ligase CRBN that targets BTK and the G1 to S phase transition protein GSPT1. GBD-9 has both PROTAC and molecular glue properties by inducing ubiquitination and proteasomal degradation of target proteins. GBD-9 can efficiently degrade wild-type and mutant BTK (such as C481S mutation) and GSPT1. GBD-9 significantly inhibits tumor cell proliferation by inducing G1 phase arrest in cancer cells, downregulating anti-apoptotic proteins (BCL-2, MCL-1) and activating Caspase-3 to induce apoptosis. GBD-9 is mainly used in the research of hematological tumors such as diffuse large B-cell lymphoma (DLBCL) and acute myeloid leukemia (AML).
GBD-9 is composed of E3 ubiquitin ligase ligand (pink part) 5-Aminothalidomide (HY-W023573), target protein ligand (blue part) Btk Inhibitor: IBT6A (HY-13036A), and PROTAC linker (black part) Nonanoic acid (HY-N7057).

NRX-0492 is an orally active BTK PROTAC degrader, with a binding IC₅₀ of 1.2 nM for both wild-type BTK and BTK^T474I, and 2.7 nM for BTK^C481S. NRX-0492 catalyzes the ubiquitination and proteasomal degradation of wild-type and drug-resistant mutant BTK by recruiting the CRBN E3 ubiquitin ligase complex. NRX-0492 inhibits the BCR signaling pathway and its downstream NF-κB/MYC transcriptional program, achieves rapid and sustained degradation in primary CLL cells, and exhibits extremely low cytotoxicity. NRX-0492 degrades BTK, inhibits tumor cell proliferation and activation, and significantly suppresses tumor growth in xenograft models. NRX-0492 can be used in research related to chronic lymphocytic leukemia and diffuse large B-cell lymphoma.

L18I is a Bruton's tyrosine kinase (BTK) PROTAC degrader that targets wild-type and BTK^C481, and recruits the cereblon E3 ligase to mediate proteasomal degradation. L18I regulates the BCR, TLR, FcγR and NLRP3 inflammasome signaling pathways, inhibits the phosphorylation of PLCγ-2, ERK1/2 and p38, and reduces the levels of B cell activation markers CD25, CD69 and CD86. L18I downregulates the NF-κB, TNF and TLR signaling pathways, reduces the production of pro-inflammatory cytokines, and decreases immune cell infiltration and immune complex deposition. L18I inhibits the proliferation of BTK-expressing lymphoma cells, induces tumor regression in xenograft models, and exhibits synergistic activity when combined with inhibitors of SYK, PI3K or Lyn. L18I can be used in research related to lupus, diffuse alveolar hemorrhage and B-cell lymphoma.

DD-03-171 is a PROTAC BTK degrader. DD-03-171 inhibits mantle cell lymphoma (MCL) cell proliferation (IC₅₀ = 5.1 nM) and prolongs the survival of mice bearing a lymphoma PDX model by degrading BTK, IKFZ1, and IKFZ3. DD-03-171 also inhibits platelet function and thrombosis. (Pink: BTK ligand 9 (HY-168292); Black: linker (HY-28875); Blue: Thalidomide-NH-CH2-COOH (HY-131717)).

BTK degrader-1 (compound 1) is a Bruton’s tyrosine kinase (BTK) bifunctional degrader that can be conjugated with CD79b. BTK degrader-1 (compound 1) has anti-tumor effect.

PROTAC BTK Degrader-2 is a potent BTK PROTAC degrader. PROTAC BTK Degrader-2 effectively reduces BTK protein levels.

(R)-Zelebrudomide ((R)-NX-2127) is an isomer of Zelebrudomide (HY-153220). Zelebrudomide is an orally active BTK-targeting PROTAC degrader, with DC₅₀ values of 4.5 nM and 31 nM against wild-type BTK and BTK^C481S mutant, respectively. Zelebrudomide recruits the cereblon E3 ubiquitin ligase complex to mediate the degradation of BTK. Zelebrudomide also acts as a molecular glue to bind the cereblon E3 ubiquitin ligase complex, mediating the degradation of IKZF1 and IKZF3. Zelebrudomide can be used in the research of B-cell malignancies.

PROTAC BTK Degrader-6 is an orally active PROTAC-based BTK degrader with a DC₅₀ of 3.18 nM. PROTAC BTK Degrader-6 induces BTK degradation via proteasomal degradation, ubiquitination, and CRBN ligase recruitment pathways. PROTAC BTK Degrader-6 inhibits NF-κB activation, mRNA expression of IL-1β and IL-6, as well as the secretion of pro-inflammatory cytokines. PROTAC BTK Degrader-6 reduces inflammatory responses in a zymosan-induced mouse model of peritonitis. PROTAC BTK Degrader-6 can be used in peritonitis-related research.

UBX-382 is an orally active BTK PROTAC degrader with a DC₅₀ of 4.56 nM. UBX-382 inhibits B-cell receptor signaling by targeting BTK. UBX-382 shows superior degradation activity for wild-type and mutant BTK proteins. UBX-382 inhibits tumor growth in murine xenograft models harboring wild-type or C481S mutant BTK-expressing TMD-8 cells. UBX-382 can be used for the study of B-cell-related blood cancers.

PROTAC BTK Degrader-10 (Example 1P) is a PROTAC degrader for BTK. PROTAC BTK Degrader-10 can be used for research of chronic lymphocytic leukemia (CLL).

DB0662 is a multi-target kinase-directed PROTAC degrader, targeting kinases including PTK2B, MAPK9, BLK, CSK, LIMK1, etc.

Mal-PEG1-Val-Cit-PABC-diphosphate-BTK degrader-1 is a cleavable linker-payload conjugate and cereblon-binding BTK bifunctional degrader. Mal-PEG1-Val-Cit-PABC-diphosphate-BTK degrader-1 induces BTK degradation and exerts cytotoxic effects when delivered via CD79b monoclonal antibody. Mal-PEG1-Val-Cit-PABC-diphosphate-BTK degrader-1, when formulated as a CD79b antibody-drug conjugate, achieves sustained in vivo BTK degradation in tumor-bearing mice with reduced systemic payload exposure. Mal-PEG1-Val-Cit-PABC-diphosphate-BTK degrader-1 can be used for the research of activated b-cell-like diffuse large b-cell lymphoma (ADC linker: (HY-130944); PROTAC: (HY-163295)).

PTD10 is a selective and potent BTK PROTAC degrader (DC₅₀ = 0.5 nM, K_D = 2.28 nM). PTD10 can recruit cereblon (CRBN) E3 ligase and form a ternary complex with BTK, thereby mediating the ubiquitination and proteasome-dependent degradation of BTK. PTD10 inhibits cancer cells proliferation, and induces cell apoptosis via activation of the caspase-dependent pathway and mitochondrial pathway. PTD10 potently inhibits the BCR, AKT and NF-κB signaling pathway. PTD10 can be used for researches of B-cell malignancies and autoimmune disease.

DBt-10 is a potent BTK PROTAC degrader (DC₅₀: 137 nM). Blue: DCAF1 binder (HY-149934); Black: linker; Pink: BTK ligand.

FDU73 is a highly effective and selective BTK PROTAC degrader with a DC₅₀ of 2.9 nM (in JeKo-1 cells). FDU73 can inhibit the proliferation of tumor cells and exhibits anti-tumor activity. (Pink: BTK ligand-14 (HY-173126); Black: Linker (HY-168297); Blue: E3 ligase ligand 59 (HY-173378); E3 ligase ligand+Linker (HY-173127))

TLT8 is a ByeTAC protein degrader targeting BTK. TLT8 non-covalently binds to Rpn-13 and BTK, thereby inducing BTK degradation. TLT8 can be used in chronic lymphocytic leukemia research. (Rpn-13 ligand: HY-159808; BTK ligand: HY-Z3101; linker: HY-172823).