We have isolated cold-sensitive fermentation mutants (Csf mutants) of a commercial baker's yeast that have practically no fermentation capacity at 5 degrees C and return to their normal capacity at 25 to 40 degrees C. CSF1 was cloned by functional complementation of the Csf phenotype. CSF1 contain an open reading frame of 8,874 nucleotides, encoding a protein of 2,958 amino acids. The nucleotide sequence was identical to that of the YLR087C gene in the Saccharomyces genome database, but there was no information about the function of the predicted CSF1 (YLR087C) protein. Gene disruption shows that CSF1 is required for growth and fermentation only at low temperatures. Permeabilized cells of the disruptant showed nearly the same ethanol production rate as those of the parent strain, even at 10 degrees C. The disruptant cells had the same glucose uptake rates as the parental cells at 30 degrees C, but three- to fivefold-lower rates than the parental cells at 10 degrees C. These findings suggest that CSF1 associates with a new nutrient transport system which exists on the plasma membrane and is required only at low temperature.
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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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