Ubiquitin conjugation factor E4 A is a protein that in humans is encoded by the UBE4A gene.[5][6]

AliasesUBE4A, E4, UBOX2, UFD2, ubiquitination factor E4A, NEDHMS Quick facts Available structures, PDB ...
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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. This gene encodes an additional conjugation factor, E4, which is involved in multiubiquitin chain assembly.[6]