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- W2069886003 abstract "The subcellular locations of transforming proteins encoded by the related avian sarcoma viruses, PRCII and Fujinami sarcoma virus (FSV), were compared by cell fractionation and by indirect immunofluorescence. Whereas both viruses encode gag-fps proteins associated with tyrosine-specific kinase activity, FSV is more highly tumorigenic than PRCII in vivo. Cell fractionation studies showed that the PRCII transforming protein, P105, became associated with the high-speed particulate fraction shortly after synthesis. However, PRCII P105 did not fractionate with the plasma membrane marker, but rather with high-density membranes. It is unique in this subcellular localization among viral tyrosine kinases. This membrane association was found to be relatively insensitive to salt concentration and did not require divalent cations. Immunofluorescent studies, using anti-fps serum, showed that the PRCII protein was present in discrete, large, cytoplasmic patches, as well as in a juxtanuclear location. In contrast, FSV-encoded P130 was found to fractionate with the plasma membrane marker when cells were analyzed in low salt in the presence of magnesium. However, at higher salt concentrations and in the absence of magnesium, the bulk of P130 was found to be soluble. Immunofluorescent staining of FSV P130 revealed a diffuse, cytoplasmic pattern that was distinct from that of the PRCII product. The observed difference in the subcellular localization of these transforming proteins may be the cause of the difference in tumorigenicity between the two viruses." @default.
- W2069886003 created "2016-06-24" @default.
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- W2069886003 date "1984-05-01" @default.
- W2069886003 modified "2023-10-16" @default.
- W2069886003 title "Transforming proteins of fujinami and PRCII avian sarcoma viruses have different subcellular locations" @default.
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- W2069886003 doi "https://doi.org/10.1016/0042-6822(84)90127-2" @default.
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