Compound (SMILES): NC(=O)c1c(-c2ccc(Oc3ccccc3)cc2)nn2c1Nc1cc(C3CCN(CC4CCN(c5ccc(N6CCC(=O)NC6=O)cc5)CC4)CC3)ccc1CC2
Modality: PROteolysis-TArgeting Chimera (PROTAC)
Target protein (POI): BTK (UniProt Q06187)
POI sequence: MAAVILESIFLKRSQQKKKTSPLNFKKRLFLLTVHKLSYYEYDFERGRRGSKKGSIDVEKITCVETVVPEKNPPPERQIPRRGEESSEMEQISIIERFPYPFQVVYDEGPLYVFSPTEELRKRWIHQLKNVIRYNSDLVQKYHPCFWIDGQYLCCSQTAKNAMGCQILENRNGSLKPGSSHRKTKKPLPPTPEEDQILKKPLPPEPAAAPVSTSELKKVVALYDYMPMNANDLQLRKGDEYFILEESNLPWWRARDKNGQEGYIPSNYVTEAEDSIEMYEWYSKHMTRSQAEQLLKQEGKEGGFIVRDSSKAGKYTVSVFAKSTGDPQGVIRHYVVCSTPQSQYYLAEKHLFSTIPELINYHQHNSAGLISRLKYPVSQQNKNAPSTAGLGYGSWEIDPKDLTFLKELGTGQFGVVKYGKWRGQYDVAIKMIKEGSMSEDEFIEEAKVMMNLSHEKLVQLYGVCTKQRPIFIITEYMANGCLLNYLREMRHRFQTQQLLEMCKDVCEAMEYLESKQFLHRDLAARNCLVNDQGVVKVSDFGLSRYVLDDEYTSSVGSKFPVRWSPPEVLMYSKFSSKSDIWAFGVLMWEIYSLGKMPYERFTNSETAEHIAQGLRLYRPHLASEKVYTIMYSCWHEKADERPTFKILLSNILDVMDEES
E3 ligase: CRBN (UniProt Q96SW2)
Ligase sequence: MAGEGDQQDAAHNMGNHLPLLPAESEEEDEMEVEDQDSKEAKKPNIINFDTSLPTSHTYLGADMEEFHGRTLHDDDSCQVIPVLPQVMMILIPGQTLPLQLFHPQEVSMVRNLIQKDRTFAVLAYSNVQEREAQFGTTAEIYAYREEQDFGIEIVKVKAIGRQRFKVLELRTQSDGIQQAKVQILPECVLPSTMSAVQLESLNKCQIFPSKPVSREDQCSYKWWQKYQKRKFHCANLTSWPRWLYSLYDAETLMDRIKKQLREWDENLKDDSLPSNPIDFSYRVAACLPIDDVLRIQLLKIGSAIQRLRCELDIMNKCTSLCCKQCQETEITTKNEIFSLSLCGPMAAYVNPHGYVHETLTVYKACNLNLIGRPSTEHSWFPGYAWTVAQCKICASHIGWKFTATKKDMSPQKFWGLTRSALLPTIPDTEDEISPDKVILCL
Cell line: TMD8 (Homo sapiens)
Cell line description: Mutation; HGNC; HGNC Mutation; HGNC; HGNC
Genetically heterogeneous, consists of 3 subclones.
A*02
In situ; Bone marrow; 
Japanese.
Cancer cell line
Assay: HTRF
DC50:  6.73 nM
Assay description: TMVD-8 cells were seeded at 20000 cells/well at a volume of 15 μl/well in cell culture medium [RPMI1640, 10% heat-inactive FBS, 1% PS] in Corning 96 well plate. TMD-8 cells were treated with compounds diluted in 0.2% DMSO, dilution was done according to the following protocol: (1) making 500× stock solution in DMSO from 1 mM by 6-fold dilution, total 8 doses were included; (2) making 2× solution in cell culture medium by transferring 0.5 μl 500× stock solution into 125 μl medium; (3) adding 15 μl of 2× solution to cells for incubation of 6 h.
HTFR Assay
After 6 h treatment, 10 μl 14×lysis buffer was added to each well; the plate was sealed and incubated for 30 min at room temperature on a plate shaker; Once the cells was lysed, 16 μL of cell lysate were transferred to a PE 384-well HTRF detection plate; 4 μL of pre-mixed HTRF antibodies were added to each well; the plate was covered with a plate sealer, and then spinned at 1000 rpm for 1 min, then incubated overnight at room temperature; the results were read on BMG PheraStar with HTRF protocol (337 nm-665 nm-620 nm).
The inhibition (degradation) percentage of the compound was calculated by the following equation: Inhibition percentage of Compound=100?100×(Signal-low control)/(High control-low control), wherein signal=each test compound group
Low control=only lysis buffer without cells, indicating that BTK is completely degraded;
High control=Cell group with added DMSO and without compound, indicating microplate readings without BTK degradation;
Dmax is the maximum percentage of inhibition (degradation).
Reference: DEGRADATION OF BRUTON'S TYROSINE KINASE (BTK) BY CONJUGATION OF BTK INHIBITORS WITH E3 LIGASE LIGAND AND METHOD OF USE (patent)
Source database: TPDdb