High resolution structures for the complexes formed by the immunosuppressive agents FK506 and rapamycin with the human immunophilin FKBP-12 have been determined by X-ray diffraction. FKBP-12 has a novel fold comprised of a five-stranded beta-sheet wrapping around a short alpha-helix with an overall conical shape. Both FK506 and rapamycin bind in the cavity defined by the beta-sheet, alpha-helix and three loops. Both FK506 and rapamycin bind in similar fashions with a set of hydrogen bonds and an unusual carbonyl binding pocket. Bound FK506 has a different conformation than free (crystalline) FK506 while rapamycin's bound conformation is virtually identical to that of unbound rapamycin. FKBP-12 is a peptidyl-prolyl isomerase (PPIase), and the structures of the complexes suggest ways in which this catalytic activity could operate. The different complexes are active in suppressing different steps of T cell activation, an activity seemingly unconnected with the PPIase activity.
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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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