Bcr-Abl oncoproteins bind directly to activators of the Ras signalling pathway

Lorri Puil, Jiaxin Liu, Gerald Gish, Geraldine Mbamalu, David Bowtell, Pier Giuseppe Pelicci, Ralph Arlinghaus, Tony Pawson

Research output: Contribution to journal › Article

Abstract

The cytosolic 185 and 210 kDa Bcr-Abl protein tyrosine kinases play important roles in the development of Philadelphia chromosome positive (Ph+) chronic myelogenous leukemia (CML) and acute lymphoblastic leukemia (Ph+ ALL). p185 and p210 Bcr-Abl contain identical abl-encoded sequences juxtaposed to a variable number of bcr-derived amino acids. As the mitogenic and transforming activities of tyrosine kinases involve stimulation of the Ras pathway, we analyzed Bcr-Abl oncoproteins for interactions with cytoplasmic proteins that mediate Ras activation. Such polypeptides include Grb2, which comprises a single Src homology 2 (SH2) domain flanked by two SH3 domains, and the 66, 52 and 46 kDa Shc proteins which possess an SH2 domain in their carboxy-terminus. Grb2 associates with tyrosine phosphorylated proteins through its SH2 domain, and with the Ras guanine nucleotide releasing protein mSos1 through its SH3 domains. mSos1 stimulates conversion of the inactive GDP-bound form of Ras to the active GTP-bound state. In bcr-abl-transformed cells, Grb2 and mSos1 formed a physical complex with Bcr-Abl. In vitro, the Grb2 SH2 domain bound Bcr-Abl through recognition of a tyrosine phosphorylation site within the amino-terminal bcr-encoded sequence (p.Tyrl77-Val-Asn-Val), that is common to both Bcr-Abl proteins. These results suggest that autophosphorylation within the Bcr element of Bcr-Abl creates a direct physical link to Grb2-mSos1, and potentially to the Ras pathway, and thereby modifies the target specificity of the Abl tyrosine kinase. Bcr-Abl tyrosine kinases also phosphorylate Shc proteins on tyrosine, inducing the formation of an Shc-Grb2 complex that also has the potential to stimulate Ras. Bcr-Abl oncoproteins may therefore couple to the Ras pathway through the formation of multiple Grb2 complexes.

Original languageEnglish
Pages (from-to)764-773
Number of pages10
JournalEMBO Journal
Volume13
Issue number4
Publication statusPublished - Feb 15 1994

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src Homology Domains
Oncogene Proteins
Protein-Tyrosine Kinases
Tyrosine
bcr-abl Fusion Proteins
Proteins
ras Proteins
Phosphorylation
Guanine Nucleotides
Philadelphia Chromosome
Chromosomes
Guanosine Triphosphate
Leukemia, Myelogenous, Chronic, BCR-ABL Positive
Precursor Cell Lymphoblastic Leukemia-Lymphoma
Chemical activation
Amino Acids
Peptides

Keywords

  • Bcr-Abl
  • Grb2
  • Leukemia
  • Ras
  • Sos

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

Cite this

Puil, L., Liu, J., Gish, G., Mbamalu, G., Bowtell, D., Pelicci, P. G., ... Pawson, T. (1994). Bcr-Abl oncoproteins bind directly to activators of the Ras signalling pathway. EMBO Journal, 13(4), 764-773.

Bcr-Abl oncoproteins bind directly to activators of the Ras signalling pathway. / Puil, Lorri; Liu, Jiaxin; Gish, Gerald; Mbamalu, Geraldine; Bowtell, David; Pelicci, Pier Giuseppe; Arlinghaus, Ralph; Pawson, Tony.

In: EMBO Journal, Vol. 13, No. 4, 15.02.1994, p. 764-773.

Research output: Contribution to journal › Article

Puil, L, Liu, J, Gish, G, Mbamalu, G, Bowtell, D, Pelicci, PG, Arlinghaus, R & Pawson, T 1994, 'Bcr-Abl oncoproteins bind directly to activators of the Ras signalling pathway', EMBO Journal, vol. 13, no. 4, pp. 764-773.
Puil L, Liu J, Gish G, Mbamalu G, Bowtell D, Pelicci PG et al. Bcr-Abl oncoproteins bind directly to activators of the Ras signalling pathway. EMBO Journal. 1994 Feb 15;13(4):764-773.
Puil, Lorri ; Liu, Jiaxin ; Gish, Gerald ; Mbamalu, Geraldine ; Bowtell, David ; Pelicci, Pier Giuseppe ; Arlinghaus, Ralph ; Pawson, Tony. / Bcr-Abl oncoproteins bind directly to activators of the Ras signalling pathway. In: EMBO Journal. 1994 ; Vol. 13, No. 4. pp. 764-773.
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