Enables ubiquitin conjugating enzyme binding activity. Contributes to ubiquitin conjugating enzyme activity. Acts upstream of or within error-free postreplication DNA repair. Predicted to be located in cytosol and nucleoplasm. Predicted to be part of UBC13-MMS2 complex and ubiquitin ligase complex. Predicted to be active in nucleus. Orthologous to several human genes including UBE2V1 (ubiquitin conjugating enzyme E2 V1).