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Five different types of protein kinase activities have been evaluated in cell lines from murine lymphomas induced by Abelson leukemia virus (A-MuLV), whose oncogene codes for a tyrosine protein kinase. Such activities were compared with those of normal cells and of cells transformed by Moloney leukemia virus (M-MuLV), lacking oncogene sequences in its genome. While cAMP-dependent protein kinase and casein kinase-1 do not undergo significant changes, casein kinase-2 rises in both A-MuLV and M-MuLV infected lymphocytes, becoming largely associated with the particulate fraction of transformed cells. Protein kinase-C on the other hand is unchanged in M-MuLV transformed cells but it undergoes a 2-3-fold increment in both soluble and particulate fractions of A-MuLV transformed lymphocytes, which also display high tyrosine protein kinase activity.
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