Interaction of E3 with both substrate and E2-Ub, brings them into proximity so that ubiquitin is transferred from E2 to the substrate. In most cases the transfer of ubiquitin is direct from E2 to substrate, but in a small subset of E3s, it occurs via a covalent E3-Ub thioester intermediate (Raymond et al. 2009).
Ohmura-Hoshino, M, Goto, E, Matsuki, Y, Aoki, M, Mito, M, Uematsu, M, Hotta, H, Ishido, S
Hatakeyama, S, Nakayama, KI
Deshaies, RJ, Joazeiro, CA
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