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• W1510800235 abstract "We have identified a tyrosine kinase activity present in tumors which were raised in rats by subcutaneous injection of Rous sarcoma virus-transformed rat cells (SR-NRK). This kinase phosphorylates tyrosine on the heavy chain of IgG from tumor-bearing rabbit (TBR) sera specific for the src gene product, pp60src. Using TBR-IgG phosphorylation as an assay, we have purified this kinase over 7200-fold. The purification procedure involves detergent extraction of tumors followed by sequential column chromatography on hydroxylapatite, DEAE-Sephacel, oligodeoxyadenosine-cellulose, an affinity column prepared from TBR-sera, and Sephacryl S-200. The IgG kinase activity behaves as a molecule of apparent Mr = 54,000 on Sephacryl S-200 molecular sieve chromatography. Analysis of the Sephacryl fractions by SDS-PAGE indicates that a major Coomassie blue-stained band with an apparent Mr = 54,000 (p54), co-elutes with the peak of kinase activity. From 600 g of tumors, approximately 200 micrograms of p54 are obtained. We have four types of evidence which show that p54 is related to pp60src. 1) Purified p54 is capable of undergoing endogenous phosphorylation in the presence of [gamma-32P]ATP producing a 32P-labeled pp54 polypeptide which is specifically immunoprecipitated by TBR-sera and contains only phosphotyrosine. 2) Purified p54 competes with 32P-labeled pp60src for binding to TBR-IgG, indicating a degree of purification over starting material which agrees very well with the results obtained by the IgG kinase assay. 3) V8 protease digestion of pp60src and p54 suggests that they share a common 26,000 fragment. 4) Antibodies to partially purified p54 specifically precipitate pp60src from Rous sarcoma virus-transformed chicken cells." @default.
• W1510800235 created "2016-06-24" @default.
• W1510800235 creator A5051950292 @default.
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• W1510800235 date "1982-06-01" @default.
• W1510800235 modified "2023-10-18" @default.
• W1510800235 title "Purification of a tyrosine-specific protein kinase from Rous sarcoma virus-induced rat tumor." @default.
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• W1510800235 doi "https://doi.org/10.1016/s0021-9258(18)34547-2" @default.
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