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. 1990 Dec;87(23):9103–9107. doi: 10.1073/pnas.87.23.9103

Tissue-specific transformation by epidermal growth factor receptor: a single point mutation within the ATP-binding pocket of the erbB product increases its intrinsic kinase activity and activates its sarcomagenic potential.

H K Shu 1, R J Pelley 1, H J Kung 1
PMCID: PMC55112  PMID: 1979168

Abstract

Avian c-erbB is activated to a leukemia oncogene following truncation of its amino-terminal, ligand-binding domain by retroviral insertion. The insertionally activated transcripts encode protein products that have constitutive tyrosine kinase activity and that can induce erythro-leukemia but not sarcomas. We have found that a single point mutation within the ATP-binding pocket of the tyrosine kinase domain in this truncated molecule can increase the ability of this oncogene to induce anchorage-independent growth of fibroblasts in vitro and fibrosarcoma formation in vivo. Associated with this increased transforming potential is a corresponding increase in the kinase activity of the mutant erbB protein product. The mutation, which converts a valine to isoleucine at position 157 of the insertionally activated c-erbB product, is at a residue that is highly conserved within the protein kinase family. To our knowledge, this is the first demonstration of a point mutation in the ATP-binding pocket that activates a tyrosine kinase.

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