The conformation of the synthetic renin inhibitor CP-69,799, bound to the active site of the fungal aspartic proteinase endothiapepsin (EC 3.4.23.6), has been determined by X-ray diffraction at 1.8 A resolution and refined to the crystallographic R factor of 16%. CP-69,799 is an oligopeptide transition--state analogue inhibitor that contains a new dipeptide isostere at the P1-P1' position. This dipeptide isostere is a nitrogen analogue of the well-explored hydroxyethylene dipeptide isostere, wherein the tetrahedral P1' C alpha atom has been replaced by trigonal nitrogen. The inhibitor binds in the extended conformation, filling S4 to S3' pockets, with hydroxyl group of the P1 residue positioned symmetrically between the two catalytic aspartates of the enzyme. Interactions between the inhibitor and the enzyme include 12 hydrogen bonds and extensive van der Waals contacts in all the pockets, except for S3'. The crystal structure reveals a bifurcated orientation of the P2 histidine side chain and an interesting relative rotation of the P3 phenyl ring to accommodate the cyclohexyl side chain at P1. The binding of the inhibitor to the enzyme, while producing no large distortions in the enzyme active site cleft, results in small but significant change in the relative orientation of the two endothiapepsin domains. This structural change may represent the action effected by the proteinase as it distorts its substrate towards the transition state for proteolytic cleavage.
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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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