ATM phosphorylation promotes autoubiquitination of COP1 in vitro (Dornan et al., 2006). The number of ubiquitin molecules shown in this reaction is set arbitrarily at 4.
Dixit, VM, Shimizu, H, O'Rourke, K, Eby, M, Dornan, D, Dudhela, T, Mah, A, Seshagiri, S
ubiquitin-protein transferase activity of p-S387-RFWD2 [cytosol]
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