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Selective proteolysis is an important regulatory mechanism in all cells. In eukaryotes, this process gains specificity by tagging proteins with the small protein ubiquitin. K48 linked polyubiquitin chains of four and more ubiquitin moieties target proteins for hydrolysis by the proteasome. Prior to degradation the polyubiquitin chain is removed from the protein, cleaved into single units, and recycled...
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