The UBC poly-protein contains 9 Ubiquitin monomers that are released by proteolysis. Either USP5 (Falquet et al. 1995) or OTULIN can perform the proteolyic cleavage reactions (Grou et al. 2015).
Falquet, L, Paquet, N, Frutiger, S, Hughes, GJ, Hoang-Van, K, Jaton, JC
Grou, CP, Pinto, MP, Mendes, AV, Domingues, P, Azevedo, JE
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