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- W1973217811 abstract "Multiple E2F1 phosphorylation sites have been described as targets of different kinases, yet their in vivo implication is uncertain. We previously reported that GSK3beta is able to phosphorylate E2F1 in vitro at Ser403 and Ser433. Recently, it has been shown that both residues are also direct targets of p38 MAP kinase. In order to determine whether Ser403 phosphorylation occurs in vivo and to elucidate its role in E2F1 transcription activity, we developed a phospho-E2F1(Ser403) antibody for use in in vivo detection studies. Our results demonstrate that endogenous E2F1 is phosphorylated in vivo on Ser403, however neither GSK3beta nor p38 MAP kinase are responsible for this event. E2F1 phosphorylation on Ser403 is induced after treatment with doxorubicin in a dose response manner. The transcriptional response of E2F1 to doxorubicin is lower in an E2F1 Ser/Ala403 mutated construct relative to the wild type, suggesting a role for Ser403 phosphorylation in DNA damage conditions. Comparative study between the expression of the bcl2 gene family induced by the wild type and E2F1 Ser/Ala403 mutant revealed a statistically different pattern between both conditions. These results suggest that phosphorylation of Ser403 could influence the selection and regulation of E2F1 target genes." @default.
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- W1973217811 date "2010-08-01" @default.
- W1973217811 modified "2023-10-01" @default.
- W1973217811 title "Study of the in vivo phosphorylation of E2F1 on Ser403" @default.
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- W1973217811 doi "https://doi.org/10.1016/j.bbamcr.2010.04.003" @default.
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