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  • Title: Identification of ErbB-2 kinase domain motifs required for geldanamycin-induced degradation.
    Author: Tikhomirov O, Carpenter G.
    Journal: Cancer Res; 2003 Jan 01; 63(1):39-43. PubMed ID: 12517775.
    Abstract:
    The ansamycin antibiotic geldanamycin (GA) induces the intracellular degradation of ErbB-2/neu. Degradation of ErbB-2 proceeds through cleavage(s) within the kinase domain, resulting in the formation of a 135 kDa ectodomain fragment and a fragment(s) of approximately 50 kDa containing the COOH-terminal region. On the basis of independent means of identification, two adjacent sequence motifs have been identified in ErbB-2 that are required for GA-induced degradation. These motifs encompass residues 776-783 and 784-786 within the NH(2)-terminal lobe of the ErbB-2 kinase domain. This is also a region in which the epidermal growth factor receptor and ErbB-2 kinase domains differ significantly in sequence. Although mutations in this region abrogate GA-induced ErbB-2 degradation, the tyrosine kinase activity of ErbB-2 is not disrupted. Interestingly, these ErbB-2 mutants are specifically resistant to GA-induced degradation but retain sensitivity to other drugs, such as staurospore and curcumin, which are also able to provoke ErbB-2 degradation.
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