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UBC13 is a member of the E2 ubiquitin-conjugating enzyme family also known as Ubiquitin-conjugating enzyme E2 N, Ubiquitin-protein ligase N, Ubiquitin carrier protein N and Bendless-like ubiquitin-conjugating enzyme. 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 a member of the E2 ubiquitin-conjugating enzyme family. UBC13 forms a heterodimer with UBE2V2 which then catalyzes the synthesis of non-canonical poly-ubiquitin chains that are linked through Lys-63. This type of poly-ubiquitination does not lead to protein degradation by the proteasome. UBC13 also mediates transcriptional activation of target genes and plays a role in the control of progress through the cell cycle and differentiation, as well as error-free DNA repair. UBC13 also contributes to the survival of cells after DNA damage.
