Currently, there are no specific protein tyrosine kinase inhibitors available. This review summarizes our efforts to develop an active-site-directed inhibitor of pp60c-srv Initial efforts are directed at determining substrate specificity with synthetic peptides and at developing a biological system to test the potential of pp60c-src inhibitors to effectively inhibit the growth of pp60c-src activated cell lines. To meet these goals, we have developed new methods for purifying recombinant pp60C-SRC, assaying tyrosine kinase activity, synthesizing cyclic peptides, and generating random peptide libraries. In addition, we discuss the generation of potential artifacts while using polyhydroxy aromatic compounds as tyrosine kinase inhibitors.
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