The fatty acid synthase genes FAS1 and FAS2 of the yeast Saccharomyces cerevisiae are under transcriptional control of pathway-specific regulators of phospholipid biosynthesis. However, site-directed mutagenesis of the respective cis-acting elements upstream of FAS1 and FAS2 revealed that additional sequences activating both genes must exist. A deletion analysis of the FAS1 promoter lacking the previously characterized inositol/choline-responsive-element motif defined a region (nucleotides -760 to -850) responsible for most of the remaining activation potency. Gel-retardation experiments and in-vitro DNase footprint studies proved the binding of the general regulatory factors Rap1p, Abf1p and Reb1p to this FAS1 upstream region. Mutation of the respective binding sites led to a drop of gene activation to 8% of the wild-type level. Similarly, we also demonstrated the presence of a Reb1p-binding site upstream of FAS2 and its importance for gene activation. Thus, in addition to the previously characterized FAS-binding factor 1 interacting with the inositol/choline-responsive-element motif, a second motif common to the promoter regions of both FAS genes could be identified. Transcription of yeast fatty acid synthase genes is therefore subjected to both the pathway-specific control affecting genes of phospholipid biosynthesis and to the activation by general transcription factors allowing a sufficiently high level of constitutive gene expression.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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