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Molecular and Cellular Biology, May 2001, p. 3534-3546, Vol. 21, No. 10
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.10.3534-3546.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Inhibition of Nuclear Import by Protein Kinase B (Akt) Regulates the Subcellular Distribution and Activity of the Forkhead Transcription Factor AFX

Amy M. Brownawell,1,* Geert J. P. L. Kops,2 Ian G. Macara,1 and Boudewijn M. T. Burgering2

Center for Cell Signaling, University of Virginia, Charlottesville, Virginia 22908,1 and Laboratory for Physiological Chemistry and Centre for Biomedical Genetics, University Medical Center, 3584CG Utrecht, The Netherlands2

Received 21 November 2000/Returned for modification 28 December 2000/Accepted 27 February 2001

AFX belongs to a subfamily of Forkhead transcription factors that are phosphorylated by protein kinase B (PKB), also known as Akt. Phosphorylation inhibits the transcriptional activity of AFX and changes the steady-state localization of the protein from the nucleus to the cytoplasm. Our goal was threefold: to identify the cellular compartment in which PKB phosphorylates AFX, to determine whether the nuclear localization of AFX plays a role in regulating its transcriptional activity, and to elucidate the mechanism by which phosphorylation alters the localization of AFX. We show that phosphorylation of AFX by PKB occurs in the nucleus. In addition, nuclear export mediated by the export receptor, Crm1, is required for the inhibition of AFX transcriptional activity. Both phosphorylated and unphosphorylated AFX, however, bind Crm1 and can be exported from the nucleus. These results suggest that export is unregulated and that phosphorylation by PKB is not required for the nuclear export of AFX. We show that AFX enters the nucleus by an active, Ran-dependent mechanism. Amino acids 180 to 221 of AFX comprise a nonclassical nuclear localization signal (NLS). S193, contained within this atypical NLS, is a PKB-dependent phosphorylation site on AFX. Addition of a negative charge at S193 by mutating the residue to glutamate reduces nuclear accumulation. PKB-mediated phosphorylation of AFX, therefore, attenuates the import of the transcription factor, which shifts the localization of the protein from the nucleus to the cytoplasm and results in the inhibition of AFX transcriptional activity.

* Corresponding author. Mailing address: University of Virginia, Center for Cell Signaling, P.O. Box 800577, Charlottesville, VA 22908. Phone: (804) 982-0083. Fax: (804) 924-1236. E-mail: amb7c{at}Virginia.edu.

Molecular and Cellular Biology, May 2001, p. 3534-3546, Vol. 21, No. 10
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.10.3534-3546.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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