Protein disulfide isomerase (PDI) is believed to function in vivo by catalyzing the isomerization of disulfide bonds in proteins and thereby facilitating their folding. In S. cerevisiae PDI is encoded by an essential gene. Deletion of nearly one-third of the C-terminal residues of PDI altered PDI's cellular localization but not cell viability. Further deletions resulted in lethality, but these truncated proteins still exhibited PDI activity in vitro. Cells carrying a variant PDI in which both-CGHC-active sites were disrupted were viable. However, these cells exhibited a delay in the disulfide bond formation and transport of carboxypeptidase Y. In vitro enzyme assays revealed that disruption of both sites abolished catalytic activity. These results indicate that PDI catalyzes disulfide bond formation both in vivo and in vitro and that the integrity of the active sites is required for catalysis. However, this catalytic activity is not essential for yeast viability.
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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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