Abstract
The gene mutated in the autosomal recessive disorder ataxia telangiectasia (AT), designated ATM (for 'AT mutated'), is a member of a family of phosphatidylinositol-3-kinase-like enzymes that are involved in cell-cycle control, meiotic recombination, telomere length monitoring and DNA-damage response1–4. Previous results have demonstrated that AT cells are hypersensitive to ionizing radiation5–7 and are defective at the Gl/S checkpoint after radiation damage8–10. Because cells lacking the protein tyrosine kinase c-Abl are also defective in radiation-induced Gl arrest11, we investigated the possibility that ATM might interact with c-Abl in response to radiation damage. Here we show that ATM binds c-Abl constitutively in control cells but not in AT cells. Our results demonstrate that the SH3 domain of c-Abl interacts with a DPAPNPPHFP motif (residues 1,373–1,382) of ATM. The results also reveal that radiation-induction of c-Abl tyrosine kinase activity is diminished in AT cells. These findings indicate that ATM is involved in the activation of c-Abl by DNA damage and this interaction may in part mediate radiation-induced Gl arrest.
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Shafman, T., Khanna, K., Kedar, P. et al. Interaction between ATM protein and c-Abl in response to DNA damage. Nature 387, 520–523 (1997). https://doi.org/10.1038/387520a0
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DOI: https://doi.org/10.1038/387520a0
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