Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. In vitro catalyzes 'Lys- 11'- and 'Lys-48'-, as well as 'Lys-63'-linked polyubiquitination (By similarity).
Hans, Fiesel, Strong, Jäckel, Rasse, Geisler, Springer, Schulz, Voigt, Kahle: "UBE2E ubiquitin-conjugating enzymes and ubiquitin isopeptidase Y regulate TDP-43 protein ubiquitination." in: The Journal of biological chemistry, Vol. 289, Issue 27, pp. 19164-79, (2014) (PubMed).