Ubiquitinating enzymes (UBEs) catalyze protein ubiquitination, a reversible process countered by deubiquitinating enzymes (DUB) action. There are five DUB subfamilies including the USP, UCH, OTU, MJD, and JAMM enzymes. USP3 (ubiquitin specific peptidase
3), also known as UBP or SIH003, is a 520 amino acid protein that contains one UBP
