Inhibition of protein kinase C by calphostin C is light-dependent
- 1 April 1991
- journal article
- Published by Elsevier BV in Biochemical and Biophysical Research Communications
- Vol. 176 (1), 288-293
- https://doi.org/10.1016/0006-291x(91)90922-t
Abstract
Calphostin C, a secondary metabolite of the fungus Cladosporium cladosporioides, inhibits protein kinase C by competing at the binding site for diacylglycerol and phorbol esters. Calphostin C is a polycyclic hydrocarbon with strong absorbance in the visible and ultraviolet ranges. In characterizing the activity of this compound, we unexpectedly found that the inhibition of [3H]phorbol dibutyrate binding was dependent on exposure to light. Ordinary fluorescent light was sufficient for full activation. The inhibition of protein kinase C activity in cell-free systems and intact cells also required light. Light-dependent cytotoxicity was seen at concentrations about 5-fold higher than those inhibiting protein kinase C.Keywords
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