Ligand-independent dimerization of oncogenic v-erbB products involves covalent interactions

Margaret A. Adelsman, Brenda K. Huntley, Nita Jane Maihle

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Mutant v-erbB products of avian c-erbB1 have previously been used to correlate structural domains of the receptor encoded by this proto-oncogene with tissue-specific transformation potential. In these studies, deletion of the ligand-binding domain of the receptor has been shown to be required for transformation of erythroblasts, fibroblasts, and endothelial cells. It has, therefore, been postulated that deletion of this domain results in an allosteric change in the receptor analogous to the ligand-bound state of the epidermal growth factor receptor; i.e., it induces a receptor conformation that is constitutively active with respect to mitogenic signaling. While oncogenic v-erbB products have been shown to be expressed on the cell surface of both fibroblasts and erythroblasts, no comprehensive analysis of the oligomeric potential of these products has been conducted. Since the first event known to follow epidermal growth factor binding to its receptor is oligomerization, and receptor dimerization has been correlated with mitogenic signaling, we have carefully analyzed the ability of several v-erbB products to oligomerize in the three target cell types transformed by these oncogenes. In this report, we demonstrate that v-erbB products can efficiently homodimerize in all three target tissues, that this dimerization is ligand independent and occurs at the cell surface, and that there is no apparent correlation between v-erbB dimerization and transformation of avian fibroblasts. Furthermore, both oncogenic and non-oncogenic v-erbB products can heterodimerize with the native c-erbB1 product in chicken embryo fibroblasts, suggesting that heterodimerization between v-erbB and native c- erbB1 is not sufficient to result in c-erbB1-mediated sarcomagenesis.

Original languageEnglish (US)
Pages (from-to)2533-2544
Number of pages12
JournalJournal of Virology
Volume70
Issue number4
StatePublished - Mar 27 1996
Externally publishedYes

Fingerprint

dimerization
Dimerization
Fibroblasts
Ligands
Erythroblasts
receptors
fibroblasts
erythroblasts
Proto-Oncogenes
Oncogenes
Epidermal Growth Factor Receptor
Epidermal Growth Factor
proto-oncogenes
Chickens
Embryonic Structures
Endothelial Cells
oncogenes
epidermal growth factor
cells
endothelial cells

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

Cite this

Adelsman, M. A., Huntley, B. K., & Maihle, N. J. (1996). Ligand-independent dimerization of oncogenic v-erbB products involves covalent interactions. Journal of Virology, 70(4), 2533-2544.

Ligand-independent dimerization of oncogenic v-erbB products involves covalent interactions. / Adelsman, Margaret A.; Huntley, Brenda K.; Maihle, Nita Jane.

In: Journal of Virology, Vol. 70, No. 4, 27.03.1996, p. 2533-2544.

Research output: Contribution to journalArticle

Adelsman, MA, Huntley, BK & Maihle, NJ 1996, 'Ligand-independent dimerization of oncogenic v-erbB products involves covalent interactions', Journal of Virology, vol. 70, no. 4, pp. 2533-2544.
Adelsman, Margaret A. ; Huntley, Brenda K. ; Maihle, Nita Jane. / Ligand-independent dimerization of oncogenic v-erbB products involves covalent interactions. In: Journal of Virology. 1996 ; Vol. 70, No. 4. pp. 2533-2544.
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