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. 1989 Aug;9(8):3385–3392. doi: 10.1128/mcb.9.8.3385

Stabilization of the p53 transformation-related protein in mouse fibrosarcoma cell lines: effects of protein sequence and intracellular environment.

O Halevy 1, A Hall 1, M Oren 1
PMCID: PMC362384  PMID: 2529426

Abstract

The transformation-related protein p53 is normally very labile. The stability of p53 is significantly increased in a number of fibrosarcoma cell lines derived from mouse tumors induced by treatment with physical or chemical agents. In many instances, p53 stabilization is correlated with the ability to form a stable complex with the heat shock protein cognate hsc70. We describe a line in which p53 is very stable yet has no detectable interaction with hsc70. The inability to form such a complex probably resides in the primary structure of the endogenous p53, since introduction of other p53 variants into those cells resulted in the appearance of a p53-hsc70 complex. The factors affecting p53 stability were investigated by stable transfection experiments. The results indicated that the primary structure of the p53 protein is a major determinant of its turnover rate; different p53 variants were degraded at distinct and characteristic rates in a number of transformed cell types. However, at least one p53 variant was degraded differently in nontransformed BALB/c-3T3 than in transformed fibrosarcoma cells, demonstrating that the specific cellular environment can also affect the stability of p53.

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