... recognize the specific protein to be ubiquitinated and catalyze the transfer of ubiquitin from E2 to this target protein. A ... les deux anneaux intérieurs sont constitués de sept sous-unités β qui contiennent le site actif de la protéase, tandis que les ... Ubiquitin-receptor proteins have an N-terminal ubiquitin-like (UBL) domain and one or more ubiquitin-associated (UBA) domains. ... This adenylated ubiquitin is then transferred to a cysteine of a second enzyme, ubiquitin-conjugating enzyme (E2). Lastly, a ...