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J. Biol. Chem., Vol. 276, Issue 20, 17276-17280, May 18, 2001

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Ataxia Telangiectasia Mutated (ATM) Kinase and ATM and Rad3 Related Kinase Mediate Phosphorylation of Brca1 at Distinct and Overlapping Sites
IN VIVO ASSESSMENT USING PHOSPHO-SPECIFIC ANTIBODIES^*

Magtouf Gatei, Bin-Bing Zhou^§, Karen Hobson, Shaun Scott, David Young, and Kum Kum Khanna^¶

From the  Queensland Institute of Medical Research, P.O. Royal Brisbane Hospital, Brisbane Qld 4029, Australia, the ^§ Department of Oncology Research, Glaxo SmithKline Beecham, King of Prussia, Pennsylvania 19406, and the ^¶ Department of Pathology, University Of Queensland, Brisbane Qld 4029, Queensland, Australia

Recent studies have provided evidence that breast cancer susceptibility gene products (Brca1 and Brca2) suppress cancer, at least in part, by participating in DNA damage signaling and DNA repair. Brca1 is hyperphosphorylated in response to DNA damage and co-localizes with Rad51, a protein involved in homologous-recombination, and Nbs1·Mre11·Rad50, a complex required for both homologous-recombination and nonhomologous end joining repair of damaged DNA. Here, we report that there is a qualitative difference in the phosphorylation states of Brca1 between ionizing radiation (IR) and UV radiation. Brca1 is phosphorylated at Ser-1423 and Ser-1524 after IR and UV; however, Ser-1387 is specifically phosphorylated after IR, and Ser-1457 is predominantly phosphorylated after UV. These results suggest that different types of DNA-damaging agents might signal to Brca1 in different ways. We also provide evidence that the rapid phosphorylation of Brca1 at Ser-1423 and Ser-1524 after IR (but not after UV) is largely ataxia telangiectasia mutated (ATM) kinase-dependent. The overexpression of catalytically inactive ATM and Rad3 related (ATR) kinase inhibited the UV-induced phosphorylation of Brca1 at these sites, indicating that ATR controls Brca1 phosphorylation in vivo after the exposure of cells to UV light. Moreover, ATR associates with Brca1; ATR and Brca1 foci co-localize both in cells synchronized in S phase and after exposure of cells to DNA-damaging agents. ATR can itself phosphorylate the region of Brca1 phosphorylated by ATM (Ser-Gln cluster in the C terminus of Brca1, amino acids 1241-1530). However, there are additional uncharacterized ATR phosphorylation site(s) between residues 521 and 757 of Brca1. Taken together, our results support a model in which ATM and ATR act in parallel but somewhat overlapping pathways of DNA damage signaling but respond primarily to different types of DNA lesion.

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