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Shafman T, Khanna KK, Kedar P, Spring K, Kozlov S, Yen T, Hobson K, Gatei M, Zhang N, Watters D, Egerton M, Shiloh Y, Kharbanda S, Kufe D, Lavin MF
Interaction between ATM protein and c-Abl in response to DNA damage
Nature (1997) 387:520-523.
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 response(1-4). Previous results have demonstrated that AT cells are hypersensitive to ionizing radiation(5-7) and are defective at the G1/S checkpoint after radiation damage(8-10). Because cells lacking the protein tyrosine kinase c-Abl are also defective in radiation-induced G1 arrest(11), 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 G1 arrest.
Publication Date: 1997-05-29.
Last updated on Thursday, April 02, 2020