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Molecular and Cellular Biology, November 1998, p. 6560-6570, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Global Regulatory Functions of Oaf1p and Pip2p (Oaf2p), Transcription Factors That Regulate Genes Encoding Peroxisomal Proteins in Saccharomyces cerevisiae

Igor V. Karpichevdagger and Gillian M. Small*

Department of Cell Biology and Anatomy, Mount Sinai School of Medicine, New York, New York 10029

Received 2 June 1998/Returned for modification 14 July 1998/Accepted 28 July 1998

Two transcription factors, Oaf1p and Pip2p (Oaf2p), are key components in the pathway by which several Saccharomyces cerevisiae genes encoding peroxisomal proteins are activated in the presence of a fatty acid such as oleate. By searching the S. cerevisiae genomic database for the consensus sequence that acts as a target for these transcription factors, we identified 40 genes that contain a putative Oaf1p-Pip2p binding site in their promoter region. Quantitative Northern analysis confirmed that the expression of 22 of the genes identified is induced by oleate and that either one or both of these transcription factors are required for the activation. In addition to known peroxisomal proteins, the regulated genes encode novel peroxisomal proteins, a mitochondrial protein, and proteins of unknown location and function. We demonstrate that Oaf1p regulates certain genes in the absence of Pip2p and that both of these transcription factors play a role in maintaining the glucose-repressed state of one gene. Furthermore, we provide evidence that the defined consensus binding site is not required for the regulation of certain oleate-responsive genes.

* Corresponding author. Mailing address: Department of Cell Biology and Anatomy, Box 1007, Mount Sinai School of Medicine, New York, NY 10029. Phone: (212) 241-0981. Fax: (212) 860-1174. E-mail: small{at}msvax.mssm.edu.

dagger Permanent address: Centre of Bioengineering, Russian Academy of Sciences, Moscow 117312, Russia.

Molecular and Cellular Biology, November 1998, p. 6560-6570, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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