Compound (SMILES): Cc1cccc(-n2nc3c(c2-c2cc4cnccc4s2)CCC3)n1
InChIKey: JQKNNVYRFRWQST-UHFFFAOYSA-N
Target: TGF-beta receptor type-1 (SINGLE PROTEIN), Homo sapiens
UniProt: P36897
Assay: Kinase Assay : ALK-5 kinase assay methods have been described in the art (see e.g., Laping et al. (2002) Mol. Pharmacol. 2002; 62: 58-62). The compounds named in the specified Examples were tested as follows for inhibition of ALK-5 autophosphorylation activity and of the ALK-5 phosphorylation of α-Casein.Materials:    Buffer. 50 mM HEPES, pH 7.6, with 10 mM NaCl, 10 mM MgCl2, and 1 mM DTT.    GST-ALK-5 protein0.44 mg/ml (roughly 7 μM stock). A 1:350 dilution gives a 20 nM stock, which translates to 2 nM final in assay. Human ALK-5 was expressed in Sf9 insect cells infected with Baculovirus expressing a ALK-5 truncation sequence (amino acids H149-M503), fused at the N-terminus to Glutathione S-transferase GST, in a pFastBac vector (Invitrogen). The cells were disrupted by sonication at 4° C. The lysate was centrifuged at 40,000×g for 45 minutes, and the supernatant applied to a 10 ml column of Glutathione Sepharose 4 Fast Flow (Amersham Bioscienses) equilibrated with 100 mM Tris-HCl pH 7.6 buffer containing 300 mM NaCl, 10% glycerol, 1% NP40, 2 mM dithiothreitol (DTT) and one Protease Inhibitor complete EDTA-free tablet per 50 ml (Roche). The column was washed with 5 column volumes of 50 mM Tris HCl pH 8.0 containing 150 mN NaCl, 10% glycerol, 2 mM DTT and one Protease Inhibitor complete EDTA-free tablet per 100 ml. The column was eluted with wash buffer containing 8 mM reduced glutathione. Fractions were collected and dialyzed overnight in 20 mM Tris HCl pH 8.0 containing 10% glycerol, 150 mM NaCl, 2 mM DTT and 1 mM 4-(2-aminoethyl)-bezenesulfonylfluoride.HCl (AEBSF) (Sigma) at 4° C.    α-Casein (Sigma, #C8032) is made up at 2 mM in Buffer (50 mg/ml).    Cold ATP contains 10 μM cold ATP (from a 10 mM stock in Buffer).    Hot ATP consists of 0.5 μCi/well □-33P-ATP (Amersham, AH9968) in Buffer.    Assay BufferPer 10 ml Buffer      1 ml of 500 mM HEPES (pH 7.6)      20 μl of 5 M NaCl      100 μl of 1 M MgCl2      10 μl of 1 M DTT (dithiothreitol)      Assay Method:In a 96 well filter-bottom plate (Millipore, #MSDV N6B 50), 58 μl Assay Buffer is added to reach well. Add 10 μl of Cold ATP mix in Assay Buffer, then 10 μl of a 1:10 dilution of α-Casein stock. Then add 2 μl of compound being tested (DMSO) at a 50× final concentration. Hot ATP mix (10 μl) is added, and the reaction is started with the addition of 10 μl of a 1:350 dilution of the ALK-5 protein (2 nM final) in Assay Buffer with 0.05% BSA (Bovine Serum Albumin). The reaction is mixed for 5 minutes at room temperature, and then continued for 145 minutes at room temperature. The reaction is then stopped with the addition of 100 μl of ice-cold 20% TCA (trichloroacetic acid). The assay is then incubated for at least 1 hour at 4° C., and then the contents of each well are filtered by suction through the filter. The wells are washed three times with 200 μl ice-cold 10% TCA. The plate bottom is blotted before and after removing plastic sub-base, and dried overnight at room temperature. Add 30 μl of scintillation fluid, and count 1 minute per well on a Wallac Tri-Lux scintillation counter.
Measurement: IC50 = 21.8 nM (pChEMBL 7.659999847412109)
Descriptors: MW 332.43, ALogP 4.34, HBA 5, HBD 0, PSA 43.6, QED 0.55