Abstract
Protein tyrosine kinases play key roles in the progression of numerous human diseases including several types of cancers. We report here a simple colorimetric assay for tyrosine kinase activity employing synthetic peptide substrates prepared on Tentagel synthesis beads. Phosphorylation of compounds on beads was detected with an antiphosphotyrosine antibody complexed with a secondary antibody-alkaline phosphatase conjugate. This assay may prove useful for the identification and characterization of synthetic substrates of this important class of enzymes.
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