This study describes the thermodynamic characterization of a Ubq-UIM fusion construct (Ubq-UIM), designed from the ubiquitin-UIM interaction system, to determine whether it exhibits cooperativity of folding. The Ubq-UIM fusion constructs exhibit higher stability than the core Ubq molecule, consistent with the finding that the UIM helix is docked to Ubq. Temperature-induced unfolding profiles of Ubq-UIM were monitored by DSC and far-UV and near-UV CD spectroscopies. Ubq-UIM appears to exhibit cooperative unfolding as indicated by results of global fits of a two-state model to far- and near-UV CD and DSC thermal unfolding data. The cooperativity of Ubq-UIM unfolding was further tested by the amino acid substitutions that selectively stabilize or destabilize Ubq, UIM, and/or the interface. The effects of these substitutions on the thermodynamic properties of Ubq-UIM are described well by a thermodynamic model for cooperativity in proteins. In particular, a substitution that lowered the stability of the Ubq-UIM interface indeed led to a decrease in cooperativity.
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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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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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Evidence ID | Analyze ID | File | Description |
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