Swa2p is an auxilin-like yeast protein that is involved in vesicular transport and required for uncoating of clathrin-coated vesicles. Swa2p contains a ubiquitin-associated (UBA) domain, which is present in a variety of proteins involved in ubiquitin (Ub)-mediated processes. We have determined a structural model of the Swa2p UBA domain in complex with Ub using NMR spectroscopy and molecular docking. Ub recognition occurs predominantly through an atypical interaction in which UBA helix alpha1 and the N-terminal part of helix alpha2 bind to Ub. Mutation of Ala148, a key residue in helix alpha1, to polar residues greatly reduced the affinity of the UBA domain for Ub and revealed a second low-affinity Ub-binding site located on the surface formed by helices alpha1 and alpha3. Surface plasmon resonance showed that the Swa2p UBA domain binds K48- and K63-linked di-Ub in a non-linkage-specific manner. These results reveal convergent evolution of a Ub-binding site on helix alpha1 of UBA domains involved in membrane protein trafficking.
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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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| Evidence ID | Analyze ID | File | Description |
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