Cyclophilins belong to the family of peptidyl-prolyl cis/trans isomerases (PPIases), which are ubiquitous and highly conserved enzymes capable of cis/trans isomerizing Xaa-Pro peptide bonds. Members of the CyP40-type cyclophilins have originally been described as components of hormone receptor complexes. Here, we describe NcCyP41, a CyP40 ortholog from Neurospora crassa, its expression in Escherichia coli and subsequent purification. Characterization of NcCyP41 reveals that it is a heat shock protein, which is active as a cyclosporin A-sensitive PPIase. Affinity chromatography using immobilized recombinant NcCyP41 yielded two major NcCyP41-binding proteins: Hsp80 (a Hsp90 ortholog from N.crassa) and CyPBP37. CyPBP37 has not been described. In addition, this is the first record describing an interaction between a member of Cyp40-type cyclophilins and of CyPBP37-type proteins, respectively. CyPBP37 expression is repressed by thiamine and in the stationary phase in N.crassa. CyPBP37 is present in different isoforms. The expression of a CyPBP37 ortholog in yeast, Thi4p, is diminished in a mutant lacking one of the two CyP40 orthologs (Cpr7p). In addition, the DeltaCpr7p deletion mutant shows a thiamine-dependent growth defect. We conclude that, in yeast, Cpr7p and Thi4p interact functionally.
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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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