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Molecular and Cellular Biology, October 2001, p. 6395-6405, Vol. 21, No. 19
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.19.6395-6405.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Upc2p and Ecm22p, Dual Regulators of Sterol Biosynthesis in Saccharomyces cerevisiae

Åshild Vik and Jasper Rine*

Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720

Received 9 May 2001/Returned for modification 7 June 2001/Accepted 2 July 2001

Sterol levels affect the expression of many genes in yeast and humans. We found that the paralogous transcription factors Upc2p and Ecm22p of yeast were sterol regulatory element (SRE) binding proteins (SREBPs) responsible for regulating transcription of the sterol biosynthetic genes ERG2 and ERG3. We defined a 7-bp SRE common to these and other genes, including many genes involved in sterol biosynthesis. Upc2p and Ecm22p activated ERG2 expression by binding directly to this element in the ERG2 promoter. Upc2p and Ecm22p may thereby coordinately regulate genes involved in sterol homeostasis in yeast. Ecm22p and Upc2p are members of the fungus-specific Zn[2]-Cys[6] binuclear cluster family of transcription factors and share no homology to the analogous proteins, SREBPs, that are responsible for transcriptional regulation by sterols in humans. These results suggest that Saccharomyces cerevisiae and human cells regulate sterol synthesis by different mechanisms.

* Corresponding author: Mailing address: Department of Molecular and Cell Biology, 401 Barker Hall, University of California at Berkeley, Berkeley, CA 94720-3202. Phone: (510) 642-7047. Fax: (510) 642-6420. E-mail: jrine{at}uclink4.berkeley.edu.

Molecular and Cellular Biology, October 2001, p. 6395-6405, Vol. 21, No. 19
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.19.6395-6405.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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