We have identified and characterized a homolog of the 40 kDa cyclophilins in the budding yeast Saccharomyces cerevisiae. At the amino acid level, this novel yeast cyclophilin, termed Cyp40, is 47% identical to human cyclophilin-40. Recombinant Cyp40 produced in bacteria has a peptidyl-prolyl cis-trans isomerase activity with a catalytic efficiency (k[cat]/K[m]) of 0.5 x 10(6)M(-1)s(-1), which can be inhibited by cyclosporin A with an IC50 value of 60nM. Using a polyclonal antibody against Cyp40 we have found that Cyp40 is predominantly cytoplasmic, and that its expression is induced 3-4-fold by heat shock. Moreover, Cyp40 can be coprecipitated from yeast extracts with the cytosolic molecular chaperone Hsp90. Surprisingly, a Cyp40-deficient yeast strain is fully viable at normal and elevated temperatures. Cyp40 is also dispensable for normal regulation of vertebrate steroid receptors in yeast. While other immunophilins could conceivably compensate a Cyp40 defect, our results are compatible with the notion that immunophilins may be fortuitous partners in the biochemically established steroid receptor-Hsp90 complex.
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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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