A new mechanistic principle by which protein tyrosine kinase substrates fluorescently report the introduction of a phosphate moiety has been developed. NMR was used to establish that tyrosine phosphorylation induces the disruption of π-π stacking interactions of the tyrosine moiety with a proximal fluorophore on the peptide substrate. We have demonstrated that (1) the peptide substrates described in this study are useful for a wide variety of different tyrosine kinases, (2) physiological concentrations of ATP can be employed (unlike the standard radioactive ATP kinase assays), thus providing a more realistic assessment of inhibitor potency, and (3) protein kinase self-activation can be observed in real-time.
Self-reporting fluorescent substrates of protein tyrosine kinases. / Wang, Qunzhao; Cahill, Sean M.; Blumenstein, Michael; Lawrence, David S.In: Journal of the American Chemical Society, Vol. 128, No. 6, 15.02.2006, p. 1808-1809.
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