Abstract
A 96,000-dalton glycoprotein, p(96), was present in cell extracts obtained from gs-chf- chicken embryo fibroblasts infected with the avian RNA tumor viruses Rous-associated virus-2 subgroup B (RAV-2) and the Schmidt-Ruppin strain of Rous sarcoma virus subgroup A (SR-RSV-A), as well as from uninfected gsLchf+ (HE) cell extracts. It was not found in cell extracts from uninfected gs-chf- or gs+chf+ (HH) cells, nor from gs-chf- cells infected with envelope-deficient Bryan high-titer Rous sarcoma virus. Immunoprecipitation, kinetic, and biochemical data indicate the this polyprotein contains information that gives rise to the major virion glycoprotein gp85. A second polyprotein of 80,000 daltons, p/80), is also present in the RAV-2- and SR-RSV-A-infected gs-chf- cells. This second polyprotein contains less carbohydrate than p(96), and kinetic and biochemical data indicate that p(80) may be an immature form of p(96).
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