The modification of proteins with ubiquitin is an important cellular mechanism for targeting abnormal or short-lived proteins for degradation. Ubiquitination involves at least three classes of enzymes: ubiquitin-activating enzymes, or E1s, ubiquitin-conjugating enzymes, or E2s, and ubiquitin-protein ligases, or E3s. UBE4B is an additional conjugation factor, E4, which is involved in multiubiquitin chain assembly. It is also the strongest candidate in the neuroblastoma tumor suppressor (1).
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