Terbium as a luminescent probe of metal-binding sites in protein kinase C.


In the present report, we demonstrate that Tb3+ binds to protein kinase C and serves as a luminescent reporter of certain cationic metal-binding sites. Tb3+ titration of 50 nM protein kinase C results in a 20-fold enhancement of Tb3+ luminescence which is half-maximal at 12 microM Tb3+. A Kd of approximately 145 nM was determined for Tb3+ binding to the… (More)


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