Abstract：
:Chick embryo fibroblasts (CEF) infected with avian sarcoma virus become rapidly transformed as a result of expression of the viral src gene in the form of a single polypeptide of molecular weight 60,000 (pp60src) with protein kinase activity and suggested preferential association with the plasma membrane. Studies with normal avian and mammalian cells have revealed the presence of an antigenically related protein which seems to have similar kinase activity, but which is present at less than 1% of the levels of virally induced src protein found in transformed cells. As dynamic phosphorylation is important in numerous regulatory processes, the phenotypic expression of transformation may arise from an imbalance in one or more regulatory mechanisms that are controlled by protein phosphorylation. The cell membrane is affected during transformation, including its phosphotransferase activity. The latter has been shown using isolated membrane fractions whose properties may be changed during preparation. Therefore, we have compared the phosphorylation state of individual membrane proteins found in intact normal and RSV-transformed cells and report here the identification of two heavily phosphorylated, acidic membrane proteins in normal CEF which are specifically dephosphorylated on transformation by wild-type and temperature-sensitive Rous sarcoma viruses.
journal_name
Naturejournal_title
Natureauthors
Witt DP,Gordon JAdoi
10.1038/287241a0subject
Has Abstractpub_date
1980-09-18 00:00:00pages
241-4issue
5779eissn
0028-0836issn
1476-4687journal_volume
287pub_type
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