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The stability of tubulins present in crude extracts of untransformed BALB/c-3T3 mouse fibroblasts, Chinese hamster lung cells, and various of their simian virus 40 transformants was assessed by measurement of their individual colchicine-binding decay rates. In all cases studied the decays followed the kinetics of first-order reactions, and rates were reduced at low temperatures and by vinblastine sulfate. Under all assay conditions, including different temperatures and protein concentrations, tubulins of normal cells decayed considerably faster than those of simian virus 40-transformed cells. Experiments performed with a number of Chinese hamster lung cell clones transformed with temperature-sensitive simian virus 40 gene A mutants showed a clear correlation between increased tubulin stability and the expression of gene A function. These results suggest that it is T-antigen, the viral gene A product, that affects tubulin.
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G Wiche, and
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G Wiche, and
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April 2020,
ACS nano,
G Wiche, and
R Furtner, and
N Steinhaus, and
R D Cole
June 1982,
Biochemistry,
G Wiche, and
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R D Cole
October 1975,
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G Wiche, and
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