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Polo‐like kinase 1 regulates mitotic arrest after UV irradiation through dephosphorylation of p53 and inducing p53 degradation
Author(s) -
Chen Jie,
Dai Gu,
Wang Yi-Qian,
Wang Sheng,
Pan Fei-Yan,
Xue Bin,
Zhao Dong-Hong,
Li Chao-Jun
Publication year - 2006
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2006.05.047
Subject(s) - plk1 , mitosis , microbiology and biotechnology , kinase , dephosphorylation , phosphorylation , cell cycle checkpoint , phosphatase , hyperphosphorylation , biology , chemistry , cell cycle , cancer research , biochemistry , cell
Ultraviolet (UV) irradiation can result in cell cycle arrest. The reactivation of Polo‐like kinase 1 (Plk1) is necessary for cell cycle reentry. But the mechanism of how Plk1 regulates p53 in UV‐induced mitotic arrest cells remained elusive. Here we find that UV treatment leads HEK293 cells to inverse changes of Plk1 and p53. Over‐expression of Plk1 rescue UV‐induced mitotic arrest cells by inhibiting p53 activation. Plk1 could also inhibit p53 phosphorylation at Ser15, thus facilitates its nuclear export and degradation. Further examination shows that Plk1, p53 and Cdc25C can form a large complex. Plk1 could bind to the sequence‐specific DNA‐binding domain of p53 and active Cdc25C by hyperphosphorylation. These results hypothesize that Plk1 and Cdc25C participate in recovery the mitotic arrest through binding to the different domain of p53. Cdc25C may first be actived by Plk1, and then its phosphatase activity makes p53 dephosphorylated at Ser15.