Compound (SMILES): COc1cc(N2CCC(N3CCN(CCNc4cccc5c4CN(C4CCC(=O)NC4=O)C5=O)CC3)CC2)c(C)cc1Nc1ncc(Br)c(Nc2cccc3c2N(S(C)(=O)=O)CC3)n1
Modality: PROteolysis-TArgeting Chimera (PROTAC)
Target protein (POI): EGFR (UniProt Q01279)
POI sequence: MRPSGTAGAALLALLAALCPASRALEEKKVCQGTSNKLTQLGTFEDHFLSLQRMFNNCEVVLGNLEITYVQRNYDLSFLKTIQEVAGYVLIALNTVERIPLENLQIIRGNMYYENSYALAVLSNYDANKTGLKELPMRNLQEILHGAVRFSNNPALCNVESIQWRDIVSSDFLSNMSMDFQNHLGSCQKCDPSCPNGSCWGAGEENCQKLTKIICAQQCSGRCRGKSPSDCCHNQCAAGCTGPRESDCLVCRKFRDEATCKDTCPPLMLYNPTTYQMDVNPEGKYSFGATCVKKCPRNYVVTDHGSCVRACGADSYEMEEDGVRKCKKCEGPCRKVCNGIGIGEFKDSLSINATNIKHFKNCTSISGDLHILPVAFRGDSFTHTPPLDPQELDILKTVKEITGFLLIQAWPENRTDLHAFENLEIIRGRTKQHGQFSLAVVSLNITSLGLRSLKEISDGDVIISGNKNLCYANTINWKKLFGTSGQKTKIISNRGENSCKATGQVCHALCSPEGCWGPEPRDCVSCRNVSRGRECVDKCNLLEGEPREFVENSECIQCHPECLPQAMNITCTGRGPDNCIQCAHYIDGPHCVKTCPAGVMGENNTLVWKYADAGHVCHLCHPNCTYGCTGPGLEGCPTNGPKIPSIATGMVGALLLLLVVALGIGLFMRRRHIVRKRTLRRLLQERELVEPLTPSGEAPNQALLRILKETEFKKIKVLGSGAFGTVYKGLWIPEGEKVKIPVAIKELREATSPKANKEILDEAYVMASVDNPHVCRLLGICLTSTVQLITQLMPFGCLLDYVREHKDNIGSQYLLNWCVQIAKGMNYLEDRRLVHRDLAARNVLVKTPQHVKITDFGLAKLLGAEEKEYHAEGGKVPIKWMALESILHRIYTHQSDVWSYGVTVWELMTFGSKPYDGIPASEISSILEKGERLPQPPICTIDVYMIMVKCWMIDADSRPKFRELIIEFSKMARDPQRYLVIQGDERMHLPSPTDSNFYRALMDEEDMDDVVDADEYLIPQQGFFSSPSTSRTPLLSSLSATSNNSTVACIDRNGLQSCPIKEDSFLQRYSSDPTGALTEDSIDDTFLPVPEYINQSVPKRPAGSVQNPVYHNQPLNPAPSRDPHYQDPHSTAVGNPEYLNTVQPTCVNSTFDSPAHWAQKGSHQISLDNPDYQQDFFPKEAKPNGIFKGSTAENAEYLRVAPQSSEFIGA
E3 ligase: CRBN (UniProt Q8C7D2)
Ligase sequence: MAGEGDQQDAAHNMGNHLPLLPAESEEEDEMEVEDQDSKEAKKPNIINFDTSLPTSHTYLGADMEEFHGRTLHDDDSCQVIPVLPQVMMILIPGQTLPLQLFHPQEVSMVRNLIQKDRTFAVLAYSNVQEREAQFGTTAEIYAYREEQDFGIEIVKVKAIGRQRFKVLELRTQSDGIQQAKVQILPECVLPSTMSAVQLESLNKCQIFPSKPVSREDQCSYKWWQKYQKRKFHCANLTSWPRWLYSLYDAETLMDRIKKQLREWDENLKDDSLPSNPIDFSYRVAACLPIDDVLRIQLLKIGSAIQRLRCELDIMNKCTSLCCKQCQETEITTKNEIFSLSLCGPMAAYVNPHGYVHETLTVYKACNLNLIGRPSTEHSWFPGYAWTVAQCKICASHIGWKFTATKKDMSPQKFWGLTRSALLPTIPDTEDEISPDKVILCL
Cell line: Ba/F3 (Mus musculus)
Cell line description: Originally thought to originate from a BALB/c mouse but is in fact from a C3H mouse.
IL3 dependent.
C3H.
In situ; Bone marrow; 
Pro-B cell; CL=CL_0000826.
Factor-dependent cell line
Assay: HTRF DTC (Del19 / T790M / C797S triple mutation); HTRF LTC (L858R / T790M / C797S triple mutation)
DC50:  21 nM
Assay description: Cell treatment
BaF3 cells are seeded at 100000 cells/well at a volume of 30μl/well in cell culture medium [RPMI1640, 10%heat-inactive FBS, 1%PS ] in Corning 96 well plate. BaF3 cells are treated with compounds diluted in 0.2%DMSO, dilution is done according to the following protocol: (1) make 500× stock solution in DMSO from 5mM by 4-fold dilution, total 8 doses were included; (2) make 2×solution in cell culture medium by transferring 0.5μl 500× stock solution into 125μl medium; (3) 30μl of 2× solution is added to cells and incubate for 16h.
HTFR assay
After 16h treatment, add 20μl 4xlysis buffer to each well ; seal the plate and incubate 1 hour 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 (for triple mutant cells , the lysate were diluted by the qual volume 1xlysis buffer before transfer) ; 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 EGFR is completely degraded;
High control = Cell group with added DMSO and without compound, indicating microplate readings without EGFR 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; IC50 is the concentration of the compound when the 50%inhibition is reached. The smaller the IC50 value is, the stronger the inhibitory ability of the compound is. Vice versa, the higher the IC50 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: BIFUNCTIONAL COMPOUNDS FOR DEGRADATION OF EGFR AND RELATED METHODS OF USE (patent)
Source database: TPDdb