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Molecular and Cellular Biology, May 2007, p. 3708-3715, Vol. 27, No. 10
0270-7306/07/$08.00+0     doi:10.1128/MCB.01838-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

A Novel Stat3 Binding Motif in Gab2 Mediates Transformation of Primary Hematopoietic Cells by the Stk/Ron Receptor Tyrosine Kinase in Response to Friend Virus Infection

Graduate Program in Immunobiology,¹ Programs in Signal Transduction and Stem Cells and Regeneration, Burnham Institute for Medical Research, La Jolla, California 92037,² Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802³

Received 28 September 2006/ Returned for modification 18 December 2006/ Accepted 27 February 2007

Friend erythroleukemia virus has long served as a paradigm for the study of the multistage progression of leukemia. Friend virus infects erythroid progenitor cells, followed by an initial polyclonal expansion of infected cells, which is driven by the activation of a naturally occurring truncated form of the Stk receptor tyrosine kinase (Sf-Stk). Subsequently, the accumulation of additional mutations in p53 and the activation of PU.1 result in full leukemic transformation. The early stages of transformation induced by Friend virus are characterized in vitro by the Epo-independent growth of infected erythroblasts. We have shown previously that this transforming event requires the kinase activity and Grb2 binding site of Sf-Stk and the recruitment of a Grb2/Gab2 complex to Sf-Stk. Here, we demonstrate that Stat3 is required for the Epo-independent growth of Friend virus-infected cells and that the activation of Stat3 by Sf-Stk is mediated by a novel Stat3 binding site in Gab2. These results underscore a central role for Stat3 in hematopoietic transformation and describe a previously unidentified role for Gab2 in the recruitment and activation of Stat3 in response to transforming signals generated by tyrosine kinases.

Published ahead of print on 12 March 2007.

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