May 25, 1976

Purification and properties of a virion protein kinase

The Journal of Biological Chemistry
H Silberstein, J T August

Abstract

The protein kinase associated with virions of frog virus 3 was purified to apparent homogeneity by ion exchange chromatography and gel filtration. The enzyme protein appeared as a single polypeptide of molecular weight 50,000 to 55,000 as determined by gel filtration, glycerol gradient sedimentation, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and comprised approximately 0.4% of the total virion protein. The activity was classified as a cyclic nucleotide-independent protein kinase as it was not effected by cyclic adenosine 3':5'-monophosphate, cyclic guanosine 3':5'-monophosphate, or inhibited by a cyclic nucleotide-dependent protein kinase inhibitor protein, and utilized GTP as well as ATP as a phosphate donor. The greatest rates of phosphorylation were obtained with acidic phosphoprotein substrates such as casein or phosvitin, although potential physiological substrates for this activity included specific virion polypeptides of frog virus.

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Mentioned in this Paper

Manganese
Protein Kinase Inhibitors
Cyclic AMP, (R)-Isomer
Protein KINASE
Histone H7
Phosvitin
Cyclic GMP
Guanosine Triphosphate
Hydrogen-Ion Concentration
Adenosine Triphosphate, Chromium Ammonium Salt

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