Homogeneous assay methods

摘要

The present invention provides a method of assaying for kinase activity, comprising contacting a fluorescently labeled phosphorylatable peptide substrate with an ATP analog in the presence of a kinase enzyme to yield a first product; contacting the first product with a reactant that comprises a biotin derivative to yield a second product; contacting the second product with a biotin-binding protein; and detecting a difference in a fluorescence polarization level from the second product as compared to a fluorescence polarization of the peptide substrate.