MAPK6 is an unstable protein that is constitutively degraded by the ubiquitin-proteasome system. Degradation is promoted by two destabilization regions in the N-terminal region of MAPK6 which are required for the conjugation of ubiquitin to the free amino-terminal by an unknown ligase (Coulombe et al, 2003; Coulombe et al, 2004). Although in this reaction ubiquitination is depicted as occuring in the cytosol, it may also occur in the nucleus.
Meloche, S, Rodier, G, Coulombe, P, Bonneil, E, Thibault, P
Meloche, S, Rodier, G, Coulombe, P, Pelletier, S, Pellerin, J
ubiquitin protein ligase activity of unknown ubiquitin ligase [cytosol]
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