Abstract
The FoxM1 transcription factor plays critical roles in the expression of genes that are essential for cell proliferation. FoxM1 null or depleted cells fail to progress through mitosis, as expression of several mitotic genes depends upon FoxM1. The transcriptional activity of FoxM1 is stimulated by cyclin-cdk-mediated phosphorylation at a site within the transcriptional activation domain. Here, we characterize the role of an N-terminal inhibitory domain in the transcriptional activity of FoxM1. Deletion of the N-terminal 232 amino-acid residues increases the transcriptional and transforming activities of FoxM1. Moreover, while the activity of the full-length FoxM1 is stimulated by growth factors, the activity of the N-terminal deletion mutant is constitutively high in all phases of the cell cycle. The N-terminal deletion also eliminates the requirement for cyclin-cdk to activate FoxM1. We provide evidence that the N-terminal domain interacts with the C-terminal half of the transcription factor to attenuate its transcriptional activity. Moreover, the N-terminal fragment inhibits the transcriptional activity of FoxM1 in G1/S cells, but not in G2/M cells. Our results suggest that cyclin-cdk phosphorylates FoxM1 to counteract the inhibition by the N-terminal domain to fully activate FoxM1 in G2/M phase.
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Acknowledgements
While this work was in progress, RHC died in his fight against pancreatic cancer. The authors dedicate this work to his memory. This work was supported by NIH grants to RHC. LFL is supported by NIH Grant CA46565, AT is supported by NIH Grant DK044525 and PR is supported by NIH Grants CA124488 and CA100035.
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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).
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Park, H., Wang, Z., Costa, R. et al. An N-terminal inhibitory domain modulates activity of FoxM1 during cell cycle. Oncogene 27, 1696–1704 (2008). https://doi.org/10.1038/sj.onc.1210814
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DOI: https://doi.org/10.1038/sj.onc.1210814
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