Autoubiquitinated COP1 is degraded by the proteasome. The number of ubiquitin molecules shown in this reaction is arbitrarily set at 4. (Dornan et al., 2006).
Dixit, VM, Shimizu, H, O'Rourke, K, Eby, M, Dornan, D, Dudhela, T, Mah, A, Seshagiri, S
endopeptidase activity of 26S proteasome [cytosol]
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