Protein disulfide-isomerase (PDI), which reactivates inactive scrambled RNase, was purified from Saccharomyces cerevisiae. The enzyme was purified 1,850-fold to apparent homogeneity by five purification steps: 30-70% ammonium sulfate fractionation, DEAE Toyopearl-650S and Butyl Toyopearl-650S chromatographies, and differential Phenyl-5PW HPLC with or without cysteine. The native enzyme had an apparent Mr of 140,000 on gel filtration chromatography, and its NH2-terminal was blocked. The Mr of its subunits were estimated to be 70,000 by sodium dodecyl sulfate polyacrylamide gel electrophoresis, indicating that the enzyme is probably composed of two identical subunits. The Mr of the subunits changed to 60,000 on endoglucosaminidase H treatment, indicating that the enzyme is transported into the endoplasmic reticulum. The enzyme has a pH optimum of 8.5, and pI of 4.02. Its enzymic properties were compared with those of purified bovine liver PDI. The Km values of yeast and bovine PDIs for scrambled RNase were 1 x 10(-5) and 2 x 10(-5) M, and their Vmax values were 6 and 7 units/mg protein, respectively. The two enzymes showed no significant differences in Km or Vmax values with respect to thiol compounds. Bacitracin inhibited both PDIs in the same fashion. These results indicate that this yeast PDI corresponds to mammalian PDI.
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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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