ELISA-Based Kinase Assay: Inhibition of erbB tyrosine kinase activity was assessed using an ELISA-based receptor tyrosine kinase assay. Kinase reactions (50 mM HEPES, pH 7.4, 125 mM NaCl, 10 mM MgCl2, 100 μM sodium orthovanadate, 2 mM dithiothreitol, 20 uM ATP, test compound or vehicle control and 1-5 nM GST-erbB per 50 uL reaction) were run in 96-well plates coated with 0.25 mg/ml poly-Glu-Tyr (Sigma). The reactions were incubated for 6 minutes at room temperature while shaking. Kinase reactions were stopped by removal of reaction mixture, then wells were washed with wash buffer comprising 3% Bovine Serum Albumin and 0.1% Tween 20 in Phosphate Buffered Saline (PBS). Phosphorylated tyrosine residues were detected by adding 0.2 μg/ml anti-phosphotyrosine antibody (Oncogene Ab-4; 50 μL/well) coupled to Horse Radish Peroxidase (HRP) for 25 minutes while shaking at room temperature.
ELISA-Based Kinase Assay: Inhibition of erbB tyrosine kinase activity was assessed using an ELISA-based receptor tyrosine kinase assay. Kinase reactions (50 mM HEPES, pH 7.4, 125 mM NaCl, 10 mM MgCl2, 100 μM sodium orthovanadate, 2 mM dithiothreitol, 20 uM ATP, test compound or vehicle control and 1-5 nM GST-erbB per 50 uL reaction) were run in 96-well plates coated with 0.25 mg/ml poly-Glu-Tyr (Sigma). The reactions were incubated for 6 minutes at room temperature while shaking. Kinase reactions were stopped by removal of reaction mixture, then wells were washed with wash buffer comprising 3% Bovine Serum Albumin and 0.1% Tween 20 in Phosphate Buffered Saline (PBS). Phosphorylated tyrosine residues were detected by adding 0.2 μg/ml anti-phosphotyrosine antibody (Oncogene Ab-4; 50 μL/well) coupled to Horse Radish Peroxidase (HRP) for 25 minutes while shaking at room temperature.
Irreversible inhibition of GST-tagged ERBB1 (unknown origin) (Met-668 to Ala-1211 residues) expressed in baculovirus infected Sf9 insect cells assessed as reduction in Glu/Tyr copolymer phosphorylation after 6 mins by ELISA
Irreversible inhibition of GST-tagged ERBB2 (unknown origin) (Ile-675 to Val-1256 residues) expressed in baculovirus infected Sf9 insect cells assessed as reduction in Glu/Tyr copolymer phosphorylation after 6 mins by ELISA
Irreversible inhibition of GST-tagged ERBB4 (unknown origin) (Gly-259 to Gly-690 residues) expressed in baculovirus infected Sf9 insect cells assessed as reduction in Glu/Tyr copolymer phosphorylation after 6 mins by ELISA
Irreversible inhibition of full length human ERBB1 autophosphorylation transfected in EGF-stimulated mouse NIH/3T3 cells incubated for 2 hrs followed by stimulation with EGF for 10 mins
Irreversible inhibition of ERBB1 autophosphorylation in EGF-stimulated human A431 cells assessed as length of drug exposure time required to provide 100% inhibition treated with compound followed by stimulation with EGF by sandwich ELISA
Irreversible inhibition of human recombinant GST-tagged JAK3 expressed in baculovirus infected Sf9 insect cells assessed as reduction in polyglutamic acid-tyrosine phosphorylation after 30 mins by ELISA
In vivo inhibition of full length human ERBB1 autophosphorylation transfected in NIH/3T3 cells implanted in mouse at 30 mg/kg, po qd for 2 days measured 24 hrs post last dose by Western blot analysis