Compound (SMILES): Cc1cc(-c2ncnc3[nH]c(-c4ccc(OC5CCN(CC6CCN(c7ccc(N8CCC(=O)NC8=O)cc7)CC6)CC5)cc4)cc23)ccc1CNC(=O)c1nc(C(C)(C)C)no1
Modality: PROteolysis-TArgeting Chimera (PROTAC)
Target protein (POI): BTK (UniProt Q06187)
POI sequence: MAAVILESIFLKRSQQKKKTSPLNFKKRLFLLTVHKLSYYEYDFERGRRGSKKGSIDVEKITCVETVVPEKNPPPERQIPRRGEESSEMEQISIIERFPYPFQVVYDEGPLYVFSPTEELRKRWIHQLKNVIRYNSDLVQKYHPCFWIDGQYLCCSQTAKNAMGCQILENRNGSLKPGSSHRKTKKPLPPTPEEDQILKKPLPPEPAAAPVSTSELKKVVALYDYMPMNANDLQLRKGDEYFILEESNLPWWRARDKNGQEGYIPSNYVTEAEDSIEMYEWYSKHMTRSQAEQLLKQEGKEGGFIVRDSSKAGKYTVSVFAKSTGDPQGVIRHYVVCSTPQSQYYLAEKHLFSTIPELINYHQHNSAGLISRLKYPVSQQNKNAPSTAGLGYGSWEIDPKDLTFLKELGTGQFGVVKYGKWRGQYDVAIKMIKEGSMSEDEFIEEAKVMMNLSHEKLVQLYGVCTKQRPIFIITEYMANGCLLNYLREMRHRFQTQQLLEMCKDVCEAMEYLESKQFLHRDLAARNCLVNDQGVVKVSDFGLSRYVLDDEYTSSVGSKFPVRWSPPEVLMYSKFSSKSDIWAFGVLMWEIYSLGKMPYERFTNSETAEHIAQGLRLYRPHLASEKVYTIMYSCWHEKADERPTFKILLSNILDVMDEES
E3 ligase: CRBN (UniProt Q96SW2)
Ligase sequence: MAGEGDQQDAAHNMGNHLPLLPAESEEEDEMEVEDQDSKEAKKPNIINFDTSLPTSHTYLGADMEEFHGRTLHDDDSCQVIPVLPQVMMILIPGQTLPLQLFHPQEVSMVRNLIQKDRTFAVLAYSNVQEREAQFGTTAEIYAYREEQDFGIEIVKVKAIGRQRFKVLELRTQSDGIQQAKVQILPECVLPSTMSAVQLESLNKCQIFPSKPVSREDQCSYKWWQKYQKRKFHCANLTSWPRWLYSLYDAETLMDRIKKQLREWDENLKDDSLPSNPIDFSYRVAACLPIDDVLRIQLLKIGSAIQRLRCELDIMNKCTSLCCKQCQETEITTKNEIFSLSLCGPMAAYVNPHGYVHETLTVYKACNLNLIGRPSTEHSWFPGYAWTVAQCKICASHIGWKFTATKKDMSPQKFWGLTRSALLPTIPDTEDEISPDKVILCL
Cell line:  (Homo sapiens)
Assay: HTRF
DC50:  1.3 nM
Assay description: HTFR assay
After 6h treatment, add 10μl 4xlysis buffer to each well; seal the plate and incubate 30min at room temperature on a plate shaker; Once the cells are lysed, 16 μL of cell lysate are transferred to a PE 384-well HTRF detection plate; 4 μL of pre-mixed HTRF antibodies are added to each well; Cover the plate with a plate sealer, spin 1000 rpm for 1 min, Incubate overnight at room temperature; Read on BMG PheraStar with HTRF protocol (337nm-665nm-620nm) .
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) .
The IC 50 (DC 50) value of a compound can be obtained by fitting the following equation
Y = Bottom + (TOP-Bottom) / (1 + ( (IC 50 /X) ^ hillslope) )
Wherein, X and Y are known values, and IC 50, Hillslope, Top and Bottom are the parameters obtained by fitting with software. Y is the inhibition percentage (calculated from the equation) , X is the concentration of the compound; IC 50 is the concentration of the compound when the 50%inhibition is reached. The smaller the IC 50 value is, the stronger the inhibitory ability of the compound is. Vice versa, the higher the IC 50 value is, the weaker the ability the inhibitory ability of the compound is; Hillslope represents the slope of the fitted curve, generally around 1 *; Bottom represents the minimum value of the curve obtained by data fitting, which is generally 0%± 20%; Top represents the maximum value of the curve obtained by data fitting, which is generally 100%±20%. The experimental data were fitted by calculating and analyzing with Dotmatics data analysis software.
Reference: DEGRADATION OF BRUTON'S TYROSINE KINASE (BTK) BY CONJUGATION OF BTK INHIBITORS WITH E3 LIGASE LIGAND AND METHODS OF USE (patent)
Source database: TPDdb