Abstract
Treatment of mouse L cells with mouse IFN gamma induced a cytoplasmic Ca-dependent protein kinase, which highly phosphorylated cellular enzymes such as phosphodiesterase and RNase in vitro. The kinase partially purified from IFN gamma-treated cells (100 units/ml, 12 h at 37 degrees C) was different from IFN-induced dsRNA-dependent protein kinase since it was dsRNA independent. The kinase may have played an important role in mediating IFN-induced biological effects, since cellular enzymes were found to alter enzyme activity after phosphorylation by the kinase in vitro.
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