Journal
JOURNAL OF MOLECULAR CELL BIOLOGY
Volume 14, Issue 1, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jmcb/mjab078
Keywords
mutant p53-393*78; mutant p53-374*48; p53; longer C-terminus p53; dominant-negative effect; drug resistance; acetylation
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Funding
- Reynolds and Ryan Families Chair Fund of Translational Cancer
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The study identifies a novel form of p53 mutation, p53 long C-terminus (p53LC), present in various human cancers, which exhibits loss-of-function and dominant-negative effects. These mutants interact with wild-type p53, retaining it in the cytoplasm and preventing it from binding to target gene promoters, thereby inhibiting its transcriptional activity. Additionally, the mutants render p53-containing cancer cells insensitive to p53-activating agents.
The vast majority of p53 missense mutants lose the wild-type (wt) function and/or exert 'dominant-negative' effects on their wt counterpart. Here, we identify a novel form of p53 mutation with an extended C-terminus (p53 long C-terminus, p53LC) in a variety of human cancers. Interestingly, the two representative mutants (named 'p53-374*48' and 'p53-393*78') as tested in this study show both loss-of-function and dominant-negative phenotypes in cell proliferation and colony formation assays. Mechanistically, p53LCs interact with and retain wt p53 in the cytoplasm and prevent it from binding to the promoters of target genes, consequently inhibiting its transcriptional activity. Also, p53LCs are very stable, though not acetylated in cells. Remarkably, the p53LCs can desensitize wt p53-containing cancer cells to p53-activating agents. Together, our results unveil a longer form of p53 mutant that possesses a dominant-negative effect on its wt counterpart, besides losing its wt activity.
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