Activation of MEK kinase 1 by the c-Abl protein tyrosine kinase in response to DNA damage |
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| Authors: | Kharbanda S Pandey P Yamauchi T Kumar S Kaneki M Kumar V Bharti A Yuan Z M Ghanem L Rana A Weichselbaum R Johnson G Kufe D |
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| Affiliation: | Dana Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA. surender_kharbanda@dfci.harvard.edu |
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| Abstract: | The c-Abl protein tyrosine kinase is activated by certain DNA-damaging agents and regulates induction of the stress-activated c-Jun N-terminal protein kinase (SAPK). Here we show that nuclear c-Abl associates with MEK kinase 1 (MEKK-1), an upstream effector of the SEK1-->SAPK pathway, in the response of cells to genotoxic stress. The results demonstrate that the nuclear c-Abl binds to MEKK-1 and that c-Abl phosphorylates MEKK-1 in vitro and in vivo. Transient-transfection studies with wild-type and kinase-inactive c-Abl demonstrate c-Abl kinase-dependent activation of MEKK-1. Moreover, c-Abl activates MEKK-1 in vitro and in response to DNA damage. The results also demonstrate that c-Abl induces MEKK-1-mediated phosphorylation and activation of SEK1-SAPK in coupled kinase assays. These findings indicate that c-Abl functions upstream of MEKK-1-dependent activation of SAPK in the response to genotoxic stress. |
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