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AKT‐dependent phosphorylation of Niban regulates nucleophosmin‐ and MDM2‐mediated p53 stability and cell apoptosis
Author(s) -
Ji Haitao,
Ding Zhiyong,
Hawke David,
Xing Dongming,
Jiang BingHua,
Mills Gordon B,
Lu Zhimin
Publication year - 2012
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/embor.2012.53
Subject(s) - nucleophosmin , protein kinase b , phosphorylation , mdm2 , microbiology and biotechnology , apoptosis , cancer research , dna damage , signal transduction , biology , chemistry , biochemistry , dna , myeloid leukemia
Although Niban is highly expressed in human cancer cells, the cellular functions of Niban remain largely unknown. We demonstrate here that ultraviolet irradiation induces phosphorylation of Niban at S602 by AKT, which increases the association of Niban with nucleophosmin and disassociation of nucleophosmin from the MDM2 complex. This leads to the promotion of MDM2–p53 interaction and subsequent p53 degradation, thereby providing an antiapoptotic effect. Conversely, depletion of or deficiency in Niban expression promotes stabilization of p53 with increased cell apoptosis. Our findings illustrate a pivotal role for AKT‐mediated phosphorylation of Niban in protecting cells from genotoxic stress–induced cell apoptosis.