We have used solid-phase chemistry to synthesize proteins equivalent to a human ubiquitin precursor (ubiquitin-52-amino-acid ribosomal protein fusion; UBICEP52) and representative of isopeptide-linked ubiquitin-protein conjugates [ubiquitin-(epsilonN)-lysine]; these proteins were precisely cleaved by a purified recombinant Drosophila deubiquitinating enzyme (DUB), UCH-D. Along with the previously synthesized ubiquitin-(alphaN)-valine, these synthetic proteins were used as substrates to assess the catalytic capacities of a number of diverse DUBs expressed in Escherichia coli: human HAUSP; mouse Unp; and yeast Ubps 1p, 2p, 3p, 6p, 11p, and 15p and Yuh1p. Distinct specificities of these enzymes were detected; notably, in addition to UCH-D, isopeptidase activity [ubiquitin-(epsilonN)-lysine cleavage] was only associated with Yuh1p, Unp, Ubp1p, and Ubp2p. Additionally, human placental 26S proteasomes were only able to cleave UBICEP52 and ubiquitin-(epsilonN)-lysine, suggesting that 26S proteasome-associated DUBs are class II-like. This work demonstrates that the synthetic approach offers an alternative to recombinant methods for the production of small proteins in vitro.
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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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