Transcription of the QCR8 gene, encoding subunit VIII of the Saccharomyces cerevisiae mitochondrial ubiquinol-cytochrome c oxidoreductase (QCR), is controlled by the carbon-source-dependent heme-activator protein complex HAP2/3/4 and the general transcriptional regulators autonomous replication-site-binding factor ABF1 and centromere-binding and promoter-binding factor CPF1. In this study, we investigate and dissect the relative contributions and mutual interactions of these regulators in transcriptional control. Transcription was analyzed both under steady-state conditions and during nutritional shifts, in hap delta mutants and after site-specific mutagenesis of the various binding sites in the chromosomal context of the QCR8 gene. We present evidence for both direct and indirect interactions between ABF1 and HAP2/3/4, and show that HAP2/3/4 is essential for a rapid transcriptional induction during transition from repressed to derepressed conditions. However, the activator is not the only determinant for carbon-source-dependent regulation, and we observe a functional difference between HAP2/3/4 and the HAP2/3 subcomplex. ABF1 is required for maintainance of basal repressed and derepressed transcription in the steady state of growth. The repressive action of the negative modulator CPF1 during escape from glucose repression is overcome through the cooperative action of ABF1 and HAP2/3/4. The implications of the intricate interactions of these DNA-binding regulators for control of expression of mitochondrial protein genes are discussed.
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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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