A salt-sensitive mutant of Kluyveromyces lactis was isolated that was unable to grow in high-salt media. This mutant was also respiratory-deficient and temperature-sensitive for growth. The mutation mapped in a single nuclear gene that is the ortholog of BCS1 of Saccharomyces cerevisiae. The BCS1 product is a mitochondrial protein required for the assembly of respiratory complex III. The bcs1 mutation of S. cerevisiae leads to a loss of respiration, but, unlike in K. lactis, it is not accompanied by salt sensitivity. All the respiratory-deficient K. lactis mutants tested were found to be salt-sensitive compared to their isogenic wild-type strains. In the presence of the respiratory inhibitor antimycin A, the wild-type strain also became salt-sensitive. By contrast, none of the S. cerevisiae respiratory-deficient mutants tested showed increased salt sensitivity. The salt sensitivity of the Klbcs1 mutant, but not its respiratory deficiency, was suppressed by the multicopy KlVMA13 gene, a homolog of the S. cerevisiae VMA13 gene encoding a subunit of the vacuolar H(+)-ATPase. These results suggest that cellular salt homeostasis in K. lactis is strongly dependent on mitochondrial respiratory activity, and/or that the ion homeostasis of mitochondria themselves could be a primary target of salt stress.
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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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