We describe a conserved yeast gene, ERO1, that is induced by the unfolded protein response and encodes a novel glycoprotein required for oxidative protein folding in the ER. In a temperature-sensitive ero1-1 mutant, newly synthesized carboxypeptidase Y is retained in the ER and lacks disulfide bonds, as shown by thiol modification with AMS. ERO1 apparently determines cellular oxidizing capacity since mutation of ERO1 causes hypersensitivity to the reductant DTT, whereas overexpression of ERO1 confers resistance to DTT. Moreover, the oxidant diamide can restore growth and secretion in ero1 mutants. Genetic tests distinguish the essential function of ERO1 from that of PDI1. We show that glutathione is not required for CPY folding and conclude that Ero1p functions in a novel mechanism that sustains the ER oxidizing potential, supporting net formation of protein disulfide bonds.
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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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