Accepts the ubiquitin-like protein NEDD8 from the uba3-nae1 E1 complex and catalyzes its covalent attachment to other proteins. The specific interaction with the E3 ubiquitin ligase rbx2, but not rbx1, suggests that the rbx2-ube2f complex neddylates specific target proteins, such as cul5. S-[NEDD8-protein]-yl-[E2 NEDD8-conjugating enzyme]-L-cysteine + [cullin]-L-lysine = [E2 NEDD8-conjugating enzyme]-L-cysteine + N(6)-[NEDD8-protein]-yl-[cullin]-L-lysine. Protein modification; protein neddylation. Interacts with uba3 and rbx2. Belongs to the ubiquitin-conjugating enzyme family. UBE2F subfamily.