Yeast sterol mutants were subjected to ESR analysis in an attempt to elucidate how altered sterol composition correlates with membrane permeability. The technique requires spin labeling the intact yeast cells with a small, water-soluble nitroxide probe (2,2,5,5 tetramethyl-3-pyrrolin-1-oxyl-3-carboxylic acid, PCA), suspending cells in a NiCl2 solution, and measuring the extent of Ni2+ entry through the membrane by its magnetic dipolar line broadening effect on the PCA signal. The wild type, A184D, was found to be impermeable to Ni2+ during all growth phases while the sterol mutant erg 6/2 was readily permeable to Ni2+. Other sources of line broadening such as increased rotational correlation time and cell nonviability are shown to be neglibible. Internal Ni2+ concentrations for erg 6/2 and kinetics of Ni2+ entry were determined.
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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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