The budding yeast UbL-UBA protein Dsk2 has a UbL domain at its N-terminus and a UBA domain at its C-terminus, and thus functions as a shuttle protein in the ubiquitin-proteasome pathway. In this report we describe two isoforms of Xenopus Dsk2-related protein, XDRP1L and XDRP1S. Difference of the two proteins in sequence was that the UbL domain of XDRP1S lacks 15 residues in the middle part of that of XDRP1L. Both XDRP1L and XDRP1S were expressed in Xenopus eggs. XDRP1L and XDRP1S bound to polyubiquitinated proteins via their UBA domains. XDRP1L also bound to the proteasome via its UbL domain, whereas the XDRP1S UbL domain was less likely to bind to the proteasome. Instead, XDRP1S not XDRP1L bound to monomeric cyclin A and prevented its degradation. The existence of such Dsk2-isoforms in Xenopus eggs suggests that the shuttling function via the UbL-UBA protein Dsk2 is evolutionally conserved across species.
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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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