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USP5 (ubiquitin carboxyl-terminal hydrolase 5) cleaves linear and branched multiubiquitin polymers with a marked preference for branched polymers. It is involved in unanchored Lys-48-linked polyubiquitin disassembly, and also binds linear and Lys-63 linked polyubiquitin with a lower affinity. Knock-down of USP5 causes the accumulation of p53/TP53 and an increase in p53/TP53 transcriptional activity because the unanchored polyubiquitin that accumulates is able to compete with ubiquitinated p53/TP53 but not with MDM2 for proteasomal recognition.
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Protein Aliases: Deubiquitinating enzyme 5; Isopeptidase T; testicular tissue protein Li 218; ubiquitin carboxy terminal hydrolase T; Ubiquitin carboxyl-terminal hydrolase 5; ubiquitin isopeptidase T; ubiquitin specific peptidase 5 (isopeptidase T); ubiquitin specific protease 5; ubiquitin specific protease 5 (isopeptidase T); Ubiquitin thioesterase 5; ubiquitin thiolesterase 5; ubiquitin-specific protease-5 (ubiquitin isopeptidase T); Ubiquitin-specific-processing protease 5
Gene Aliases: AA407472; ISOT; ISOT-1; Ucht; USP5
UniProt ID: (Human) P45974, (Mouse) P56399
Entrez Gene ID: (Human) 8078, (Rat) 297593, (Mouse) 22225
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