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- W1963809300 abstract "p53 maintains genome integrity by initiating the transcription of genes involved in cell-cycle arrest, senescence, apoptosis and DNA repair. The activity of p53 is regulated by both post-translational modifications and protein–protein interactions. p53 that has been phosphorylated at S366, S378 and T387 binds 14-3-3 proteins in vitro. Here, we show that these sites are potential 14-3-3 binding sites in vivo. Epsilon (ε) and gamma (γ) isoforms required phosphorylation at either of these sites for efficient interaction with p53, while for sigma (σ) and tau (τ) these sites are dispensable. Further, σ and τ bound more weakly to p53 C-terminal phosphopeptides than did ε and γ. However, the four isoforms bound tightly to di-phosphorylated p53 C-terminal peptides than did the mono-phosphorylated counterparts. Interestingly, all the isoforms studied transcriptionally activated wild-type p53. σ and τ stabilized p53 levels in cells, while ε and γ stimulated p53-DNA binding activity in vitro. Overall, the results suggest that structurally and functionally similar 14-3-3 isoforms may exert their regulatory potential on p53 through different mechanisms. We discuss the isoform-specific roles of 14-3-3 in p53 stabilization and activation of specific-DNA binding." @default.
- W1963809300 created "2016-06-24" @default.
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- W1963809300 date "2009-11-20" @default.
- W1963809300 modified "2023-10-18" @default.
- W1963809300 title "Mechanistic differences in the transcriptional activation of p53 by 14-3-3 isoforms" @default.
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- W1963809300 doi "https://doi.org/10.1093/nar/gkp1041" @default.
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