Abstract
Phosphorylation of p53 at Ser 46 was shown to regulate p53 apoptotic activity. Here we demonstrate that homeodomain-interacting protein kinase-2 (HIPK2), a member of a novel family of nuclear serine/threonine kinases, binds to and activates p53 by directly phosphorylating it at Ser 46. HIPK2 localizes with p53 and PML-3 into the nuclear bodies and is activated after irradiation with ultraviolet. Antisense inhibition of HIPK2 expression reduces the ultraviolet-induced apoptosis. Furthermore, HIPK2 and p53 cooperate in the activation of p53-dependent transcription and apoptotic pathways. These data define a new functional interaction between p53 and HIPK2 that results in the targeted subcellular localization of p53 and initiation of apoptosis.
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Acknowledgements
We thank M. Crescenzi and G. Blandino for helpful advice and stimulating discussions. G.D. and S.S. are particularly grateful to A. Sacchi for her constant availability, support and scientific inspiration. I.M. and M.G. are recipients of fellowships from Fondazione Italiana per la Ricerca sul Cancro. This work was supported by a New Unit Start-Up Grant to S.S. and by Investigator Grants to G.D.S. and G.P. from Associazione Italiana per la Ricerca sul Cancro.
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D'Orazi, G., Cecchinelli, B., Bruno, T. et al. Homeodomain-interacting protein kinase-2 phosphorylates p53 at Ser 46 and mediates apoptosis. Nat Cell Biol 4, 11–19 (2002). https://doi.org/10.1038/ncb714
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DOI: https://doi.org/10.1038/ncb714
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