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Assay Method Information

Assay Name:  Enzyme Assay
Description:  Kinase activity and inhibition was measured by established protocols (see e.g. Braunwalder et al., A Solid-Phase Assay for the Determination of Protein Tyrosine Kinase Activity of c-src Using Scintillating Microtitration Plates, Anal Biochem. 234, 1, 23-26). In such cases, the transfer of 33PO4 from ATP to the synthetic substrates poly(Glu, Tyr) 4:1 or poly(Arg, Ser) 3:1 attached to the bioactive surface of microtiter plates is taken as a measure of enzyme activity. After an incubation period, the amount of phosphate transferred is measured by first washing the plate with 0.5% phosphoric acid, adding liquid scintillant, and then counting in a liquid scintillation detector. The IC50 is determined by the concentration of compound that causes a 50% reduction in the amount of 33P incorporated onto the substrate bound to the plate.
Affinity data for this assay
 

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Last update November 1, 2007
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