Abstract
The calcium- and phospholipid-dependent kinase activity (protein kinase C) was isolated from bovine brains by a combination of DEAE-cellulose chromatography, gel filtration and hydrophobic chromatography on octyl-Sepharose and phenyl-Sepharose. The phorbol ester receptor co-purifies with the protein kinase C throughout the procedure yielding a homogeneous protein of 79 500 daltons on SDS-polyacrylamide gels. The purified kinase incorporated approximately 5000 nmol phosphate into substrate/min/mg protein at saturating concentrations of Ca2+ and phosphatidyl serine. Reciprocal plots of protein kinase activity at varying phosphatidyl serine concentrations were biphasic and yielded two apparent Ka values for phosphatidyl serine of 0.6-2 and 35-80 micrograms/ml). These apparent Ka values were reduced 2- to 3-fold by either diolein (20 micrograms/ml) or phorbol-12,13-dibutyrate (10 micrograms/ml). The protein binds [3H]phorbol-12,13-dibutyrate ( [3H]PDB) with high affinity (Ka = 15 nM) in a phosphatidyl serine-dependent manner. At saturating phosphatidyl serine concentrations 0.89 mol [3H]PDB are bound per mol protein. The identification of protein kinase C as the phorbol ester receptor is discussed with respect to the function and regulation of this protein.
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Selected References
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