Abstract
Acute promyelocytic leukemia is associated with chromosomal translocations that involve the RARα gene and several distinct loci producing a variety of fusion proteins. One such fusion partner is promyelocytic leukemia zinc-finger gene (PLZF), a member of the POK (POZ and Krüppel) family of transcriptional repressors that is a key developmental regulator, stem cell maintenance factor and tumor suppressor. Overexpression of PLZF has been shown to induce cell cycle arrest at the G1 to S transition and repress the expression of key pro-proliferative genes such as CCNA2 and MYC. However, given this data suggesting an important growth inhibitory role for PLZF, relatively little is known regarding regulation of its activity. Here we show that the main cyclin-dependent kinase involved at the G1 to S transition (CDK2) phosphorylates PLZF at two consensus sites found within PEST domains present in the hinge region of the protein. This phosphorylation triggers the ubiquitination and subsequent degradation of PLZF, which impairs PLZF transcriptional repression ability and antagonizes its growth inhibitory effects. This critical mechanism of PLZF regulation may thus be relevant for cell cycle progression during the development and the pathogenesis of human cancer.
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Acknowledgements
We thank T Merghoub for supplying the PLZF reporter construct, E Rego, M Bhaumik and F Piazza for experimental assistance and other members of the Pandolfi lab for advice and constructive discussion. This work was supported by the NCI through grant CA-71692 to PPP and by Spanish Ministry of Education and Science (MEC) through grant SAF2005-00306 and Xunta de Galicia through grant PGIDIT05PXIB20801PR to JAC.
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Costoya, J., Hobbs, R. & Pandolfi, P. Cyclin-dependent kinase antagonizes promyelocytic leukemia zinc-finger through phosphorylation. Oncogene 27, 3789–3796 (2008). https://doi.org/10.1038/onc.2008.7
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DOI: https://doi.org/10.1038/onc.2008.7
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