The COX6 gene encodes subunit VI of cytochrome c oxidase. Previously, this gene and its mRNAs were characterized, and its expression has been shown to be subject to glucose repression/derepression. In this study we have examined the effects of heme and the HAP1 (CYP1) and HAP2 genes on the expression of COX6. By quantitating COX6 RNA levels and assaying beta-galactosidase activity in yeast cells carrying COX6-lacZ fusion genes, we have found that COX6 is regulated positively by heme and HAP2, but is unaffected by HAP1. Through 5' deletion analysis we have also found that the effects of heme and HAP2 on COX6 are mediated by sequences between 135 and 590 base pairs upstream of its initiation codon. These findings identify COX6 as the fourth respiratory protein gene that is known to be regulated positively by heme and HAP2. The other three, CYC1, COX4, and COX5a, encode iso-1-cytochrome c, cytochrome c oxidase subunit IV, and an isolog, Va, of cytochrome c oxidase subunit V, respectively. Thus, it appears that the biogenesis of two interacting proteins, cytochrome c and cytochrome c oxidase, in the mitochondrial respiratory chain, are under the control of common factors.
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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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