Direct binding of eps8 to the juxtamembrane domain of EGFR is phosphotyrosine- and SH2-independent

P. Castagnino, Z. Biesova, W. T. Wong, F. Fazioli, G. N. Gill, P. P. Di Fiore

Research output: Contribution to journalArticlepeer-review


Several signal transducers bind through their SH2 domains to phosphotyrosine-containing motifs present in receptor tyrosine kinases (RTKs). However, the juxtamembrane regions of the epidermal growth factor receptor (EGFR) and of the related erbB-2 protein, while important in mitogenic signalling, lack demonstrable tyrosine phosphorylation sites, suggesting that other modalities of receptor-transducer interactions exist. A candidate for investigating this type of association is p97(eps8), a recently described substrate for RTKs. p97(eps8) is phosphorylated by several RTKs, associates with EGFR in vivo and, upon overexpression, enhances the transduction of EGFR-mediated mitogenic signals. Here we report that eps8 binds directly to the juxtamembrane region of EGFR through a domain that does not bear resemblance to SH2 domains and by a mechanism that does not require the presence of phosphotyrosine residues. Thus, the physical association between EGFR and eps8 represents a novel interaction between RTKs and their substrates.

Original languageEnglish
Pages (from-to)723-729
Number of pages7
Issue number4
Publication statusPublished - 1995


  • Binding
  • EGFR
  • eps 8
  • Juxtamembrane

ASJC Scopus subject areas

  • Cancer Research
  • Genetics
  • Molecular Biology


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