Self-reporting fluorescent substrates of protein tyrosine kinases

Qunzhao Wang, Sean M. Cahill, Michael Blumenstein, David S. Lawrence

Research output: Contribution to journalArticlepeer-review

69 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1808-1809
Number of pages2
JournalJournal of the American Chemical Society
Issue number6
StatePublished - Feb 15 2006

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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