Engineered xylose-metabolizing Saccharomyces cerevisiae cells grown on xylose show increased expression of YMR315W at both the mRNA and protein levels. Additionally, the YMR315W promoter contains a putative binding site for the transcription factor Stb5p, which has been shown to regulate genes involved in NADPH production such as ZWF1, GND1 and GND2. We hypothesized that Ymr315wp, a conserved protein of unknown function, is an additional source of NADPH in wild-type cells. In this study, we purified histidine-tagged enzyme and determined that Ymr315wp is an NADP(H)-specific oxidoreductase. We also showed that YMR315W transcription is regulated by Stb5p in response to diamide induced NADPH depletion. Overexpression of Ymr315wp in BY4727 cells resulted in elevated NADPH levels and increased resistance to diamide. However, the presence of Ymr315wp in cells lacking the oxidative branch of the pentose phosphate pathway resulted in decreased NADPH levels and increased diamide sensitivity. These results suggest that in BY4727 cells Ymr315wp contributes to NADPH production as an alternative source of NADPH.
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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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