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Inhibition of TFII-I-Dependent Cell Cycle Regulation by p53

Programs in Immunology,¹ Genetics, Sackler School of Graduate Biomedical Sciences, Department of Pathology, Tufts University School of Medicine, 150 Harrison Avenue, Boston, Massachusetts 02111,³ Department of Biological Sciences, Columbia University, New York, New York 10027,² Lombardi Comprehensive Cancer Center, Department of Oncology, Georgetown University, 3970 Reservoir Rd. NW, Washington, D.C. 20057-1468⁴

Received 21 April 2005/ Returned for modification 13 July 2005/ Accepted 21 September 2005

The multifunctional transcription factor TFII-I is tyrosine phosphorylated in response to extracellular growth signals and transcriptionally activates growth-promoting genes. However, whether activation of TFII-I also directly affects the cell cycle profile is unknown. Here we show that under normal growth conditions, TFII-I is recruited to the cyclin D1 promoter and transcriptionally activates this gene. Most strikingly, upon cell cycle arrest resulting from genotoxic stress and p53 activation, TFII-I is ubiquitinated and targeted for proteasomal degradation in a p53- and ATM (ataxia telangiectasia mutated)-dependent manner. Consistent with a direct role of TFII-I in cell cycle regulation and cellular proliferation, stable and ectopic expression of wild-type TFII-I increases cyclin D1 levels, resulting in accelerated entry to and exit from S phase, and overcomes p53-mediated cell cycle arrest, despite radiation. We further show that the transcriptional regulation of cyclin D1 and cell cycle control by TFII-I are dependent on its tyrosine phosphorylation at positions 248 and 611, sites required for its growth signal-mediated transcriptional activity. Taken together, our data define TFII-I as a growth signal-dependent transcriptional activator that is critical for cell cycle control and proliferation and further reveal that genotoxic stress-induced degradation of TFII-I results in cell cycle arrest.

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