Mutations in four genes: sconA (formerly suA25meth, mapA25), sconB (formerly mapB1), sconC and sconD, the last two identified in this work, relieve a group of sulphur amino acid biosynthetic enzymes from methionine-mediated sulphur metabolite repression. Exogenous methionine has no effect on sulphate assimilation in the mutant strains, whereas in the wild type it causes almost complete elimination of sulphate incorporation. In both mutant and wild-type strains methionine is efficiently taken up and metabolized to S-adenosylmethionine, homocysteine and other compounds, scon mutants also show elevated levels of folate-metabolizing enzymes which results from the large pool of homocysteine found in these strains. The folate enzymes appear to be inducible by homocysteine and repressible by methionine (or S-adenosylmethionine).
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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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