Has no ubiquitin ligase activity on its own. The ube2v/ube2n heterodimer 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. Mediates transcriptional activation of target genes. Plays a role in the control of progress through the cell cycle and differentiation. Plays a role in the error-free DNA repair pathway and contributes to the survival of cells after DNA damage (By similarity). Heterodimer with ube2n. Belongs to the ubiquitin-conjugating enzyme family.