E3 ubiquitin ligase CHIP (STUB1) mediates ERBB2 ubiquitination by associating with the ERBB2 indirectly, through the chaperone protein HSP90. CHIP (STUB1) ubiquitinates both ERBB2 and HSP90, leading to their proteasome-dependent degradation. Ubiquitination of ERBB2 by CHIP (STUB1) is independent of ERBB2 activation.
Mimnaugh, E, Yuan, X, Neckers, LM, Marcu, M, Xu, W, Patterson, C
ubiquitin-protein transferase activity of STUB1 [cytosol]
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