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Official Full Name: ubiquitination factor E4B
Also known as: E4; UFD2; HDNB1; UBOX3; UFD2A
Ubiquitin modification of proteins is an important cellular mechanism for the degradation of abnormal or short-lived proteins. Ubiquitination involves at least three classes of enzymes: ubiquitin activating enzymes (E1s), ubiquitin conjugating enzymes (E2s) and ubiquitin protein ligases (E3s). This gene encodes an additional coupling factor, E4, which is involved in polyubiquitin chain assembly. This gene is also the strongest candidate among neuroblastoma tumor suppressor genes. Alternative splice transcript variants of this gene have been found to encode distinct isoforms.