title: The yeast gene COQ5 is differentially regulated by Mig1p, Rtg3p and Hap2p.
abstract: Ubiquinone (CoQ) is an important component of the electron transport chain and serves to regenerate cellular anti-oxidants. In Saccharomyces cerevisiae, expression of the COQ5 gene, encoding for a C-methyltransferase involved in CoQ synthesis, is transcriptionally regulated by carbon source. We have identified three transcription factors involved in this regulation. Mig1p repressed COQ5 expression on dextrose, while Rtg1p/Rtg3p heterodimers up-regulated COQ5 expression on oleic acid. Hap2p modulated the response to oleic acid but did not have an effect in other nonfermentable carbon sources such as glycerol. These results suggest that the regulation of COQ5 gene expression by carbon source is multifactorial and involves the interaction of various transcription factors.
authors.affiliation: Division of Nutritional Sciences, Department of Human Ecology, A2703, University of Texas at Austin, Austin, TX 78712-1097, USA. rhagerman@mail.utexas.edu
authors.forename: Ruth A
authors.initials: RA
authors.lastname: Hagerman
authors.forename: Richard A
authors.initials: RA
authors.lastname: Willis
mesh_terms: D001483:Base Sequence; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D023081:CCAAT-Binding Factor / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000494:pharmacology; D005656:Fungal Proteins / Q000494:pharmacology; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects; D005947:Glucose; D008780:Methyltransferases / Q000032:analysis / Q000096:biosynthesis / Q000235:genetics*; D008969:Molecular Sequence Data; D019301:Oleic Acid; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000096:biosynthesis; D012097:Repressor Proteins / Q000494:pharmacology; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000494:pharmacology; D014157:Transcription Factors; D001616:beta-Galactosidase / Q000032:analysis
chemical_list: D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D023081:CCAAT-Binding Factor; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C085976:MIG1 protein, S cerevisiae; D012333:RNA, Messenger; C104438:RTG3 protein, S cerevisiae; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D019301:Oleic Acid; C105459:COQ5 protein, S cerevisiae; D008780:Methyltransferases; D001616:beta-Galactosidase; D005947:Glucose