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pubmed-article:21445056pubmed:abstractTextMany p53 missense mutations possess dominant-negative activity and oncogenic gain of function. We report that for structurally destabilized p53 mutants, these effects result from mutant-induced coaggregation of wild-type p53 and its paralogs p63 and p73, thereby also inducing a heat-shock response. Aggregation of mutant p53 resulted from self-assembly of a conserved aggregation-nucleating sequence within the hydrophobic core of the DNA-binding domain, which becomes exposed after mutation. Suppressing the aggregation propensity of this sequence by mutagenesis abrogated gain of function and restored activity of wild-type p53 and its paralogs. In the p53 germline mutation database, tumors carrying aggregation-prone p53 mutations have a significantly lower frequency of wild-type allele loss as compared to tumors harboring nonaggregating mutations, suggesting a difference in clonal selection of aggregating mutants. Overall, our study reveals a novel disease mechanism for mutant p53 gain of function and suggests that, at least in some respects, cancer could be considered an aggregation-associated disease.lld:pubmed
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pubmed-article:21445056pubmed:articleTitleGain of function of mutant p53 by coaggregation with multiple tumor suppressors.lld:pubmed
pubmed-article:21445056pubmed:affiliationSwitch Laboratory, Flanders Institute for Biotechnology, Vrije Universiteit Brussel, Brussels, Belgium.lld:pubmed
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