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- W46307890 abstract "The biosynthesis of fibronectin by human embryo fibroblasts, transformed by SV-40 virus, was investigated in intact cells and in a cell-free protein-synthesizing system on free and membrane-bound polyribosomes, isolated from the same cells. It was shown that fibronectin production in the culture medium by transformed fibroblasts is reduced by a factor of 4.5, while its percent content in the medium is decreased by a factor of 2. The content of fibronectin material precipitable by antibodies during the immunoprecipitation reaction proved to be somewhat greater in transformed cells than in normal cells, although the percentage was decreased by a factor of 1.5. However, the content of the fibronectin monomer with molecular weight 220 kilodaltons was 1.6 times as great in the cellular material of normal fibroblasts. In an investigation of fibronectin biosynthesis in a cell-free system it was established that in transformed cells 45% of the fibronectin is synthesized on free polyribosomes; in normal fibroblasts only 13% of the fibronectin is synthesized on free polyribosomes. It is suggested that one of the consequences of the transformation of human fibroblasts by SV-40 virus, leading to a decrease in fibronectin production, is the spatial uncoupling of the polyribosomes and membrane structures responsible formore » protein transport out of the cell, as a result of which a substantial portion of the fibronectin synthesized by transformed fibroblasts is subjected to intracellular degradation.« less" @default.
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- W46307890 date "1986-10-10" @default.
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- W46307890 title "Biosynthesis of fibronectin by human embryo fibroblasts" @default.
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