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Mol Cell Biol, June 1998, p. 3310-3320, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

TFII-I Enhances Activation of the c-fos Promoter through Interactions with Upstream Elements

Dae-Won Kim,1 Venugopalan Cheriyath,2 Ananda L. Roy,2 and Brent H. Cochran1,*

Department of Cellular and Molecular Physiology1 and Department of Pathology,2 Tufts University School of Medicine, Boston, Massachusetts 02111

Received 5 December 1997/Returned for modification 19 January 1998/Accepted 20 March 1998

The transcription factor TFII-I was initially isolated as a factor that can bind to initiator elements in core promoters. Recent evidence suggests that TFII-I may also have a role in signal transduction. We have found that overexpression of TFII-I can enhance the response of the wild-type c-fos promoter to a variety of stimuli. This effect depends on the c-fos c-sis-platelet-derived growth factor-inducible factor binding element (SIE) and serum response element (SRE). There is no effect of cotransfected TFII-I on the TATA box containing the c-fos basal promoter. Three TFII-I binding sites can be found in c-fos promoter. Two of these overlap the c-fos SIE and SRE, and another is located just upstream of the TATA box. Mutations that distinguish between serum response factor (SRF), STAT, and TFII-I binding to the c-fos SIE and SRE suggest that the binding of TFII-I to these elements is important for c-fos induction in conjunction with the SRF and STAT transcription factors. Moreover, TFII-I can form in vivo protein-protein complexes with the c-fos upstream activators SRF, STAT1, and STAT3. These results suggest that TFII-I may mediate the functional interdependence of the c-fos SIE and SRE elements. In addition, the ras pathway is required for TFII-I to exert its effects on the c-fos promoter, and growth factor stimulation enhances tyrosine phosphorylation of TFII-I. These results indicate that TFII-I is involved in signal transduction as well as transcriptional activation of the c-fos promoter.

* Corresponding author. Mailing address: Department of Physiology, Tufts University School of Medicine, 136 Harrison Ave., Boston, MA 02111. Phone: (617) 636-0442. Fax: (617) 636-6745. E-mail: cochran{at}opal.tufts.edu.

Mol Cell Biol, June 1998, p. 3310-3320, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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