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Transformed cells exhibit altered response to db cycle amp-mediated modulation of protein phosphorylation and different endogenous phosphoprotein acceptors.

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Endogenous protein phosphorylation has been studied in extracts from rat cells transformed by temperature-sensitive derivatives of Rous sarcoma virus which can reversibly express a transformed behavior at 33 degrees C and reacquire "normal" properties at 39 degrees C. The expression of transformation appeared associated with marked alterations in the type of phosphoprotein acceptors and with an increased protein kinase activity, particularly in detergent solubilized fractions. A comparison of the effect of dibutyryl cyclic AMP on protein phosphorylation revealed a transformation-dependent response, as well as a different effect of the cycle nucleotide in cytoplasmic and detergent solubilized fractions. Our studies suggest that the processes leading to malignant transformation are accompanied by altered response of the phosphorylating system to cyclic nucleotide-mediated modulation and by marked alteration in phosphoprotein acceptors.

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