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J. Biol. Chem., Vol. 276, Issue 15, 11465-11468, April 13, 2001
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,
Dana-Farber Cancer Institute, Harvard Medical School, Boston,
Massachusetts 02115 and The Abl family of mammalian nonreceptor tyrosine
kinases consists of c-Abl and ARG (Abl-related gene). Certain insights
are available regarding the involvement c-Abl in the response of cells to stress. ARG, however, has no known function in cell signaling. The
present studies demonstrate that ARG associates with the proapoptotic Siva-1 protein. The functional significance of the ARG-Siva-1 interaction is supported by the finding that ARG is activated by
oxidative stress and that this response involves ARG-mediated phosphorylation of Siva-1 on Tyr48. The proapoptotic
effects of Siva-1 are accentuated in cells stably expressing ARG and
are inhibited in ARG-deficient cells. Moreover, the proapoptotic
effects of Siva-1 are abrogated by mutation of the Tyr48
site. We also show that the apoptotic response to oxidative stress is
attenuated in ARG-deficient cells and that this defect is corrected by
reconstituting ARG expression. These findings support a model in which
the activation of ARG by oxidative stress induces apoptosis by a
Siva-1-dependent mechanism.
Department of Molecular Biophysics and
Biochemistry, Yale University, New Haven, Connecticut 06520, and
§ Department of Microbiology and Immunology, University of Illinois at
Chicago, Chicago, Illinois 60612
To whom correspondence should be addressed: Dana-Farber
Cancer Institute, Harvard Medical School, 44 Binney St., Boston, MA 02115. Tel.: 617-632-3141; Fax: 617-632-2934; E-mail:
donald_kufe@dfci.harvard.edu.
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