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Molecular and Cellular Biology, July 2005, p. 5363-5379, Vol. 25, No. 13
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.13.5363-5379.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

ATM Activation and Its Recruitment to Damaged DNA Require Binding to the C Terminus of Nbs1

Zhongsheng You,1,{dagger} Charly Chahwan,2,{dagger} Julie Bailis,1 Tony Hunter,1* and Paul Russell2*

Molecular and Cell Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037,1 Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 920372

Received 25 March 2005/ Returned for modification 3 April 2005/ Accepted 7 April 2005

ATM has a central role in controlling the cellular responses to DNA damage. It and other phosphoinositide 3-kinase-related kinases (PIKKs) have giant helical HEAT repeat domains in their amino-terminal regions. The functions of these domains in PIKKs are not well understood. ATM activation in response to DNA damage appears to be regulated by the Mre11-Rad50-Nbs1 (MRN) complex, although the exact functional relationship between the MRN complex and ATM is uncertain. Here we show that two pairs of HEAT repeats in fission yeast ATM (Tel1) interact with an FXF/Y motif at the C terminus of Nbs1. This interaction resembles nucleoporin FXFG motif binding to HEAT repeats in importin-ß. Budding yeast Nbs1 (Xrs2) appears to have two FXF/Y motifs that interact with Tel1 (ATM). In Xenopus egg extracts, the C terminus of Nbs1 recruits ATM to damaged DNA, where it is subsequently autophosphorylated. This interaction is essential for ATM activation. A C-terminal 147-amino-acid fragment of Nbs1 that has the Mre11- and ATM-binding domains can restore ATM activation in an Nbs1-depleted extract. We conclude that an interaction between specific HEAT repeats in ATM and the C-terminal FXF/Y domain of Nbs1 is essential for ATM activation. We propose that conformational changes in the MRN complex that occur upon binding to damaged DNA are transmitted through the FXF/Y-HEAT interface to activate ATM. This interaction also retains active ATM at sites of DNA damage.

* Corresponding author. Mailing address for Paul Russell: Department of Molecular Biology, MB3, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037. Phone: (858) 784-8273. Fax: (858) 784-2265. E-mail: prussell{at}scripps.edu. Mailing address for Tony Hunter: Molecular and Cell Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037. Phone: (858) 453-4100. Fax: (858) 457-4765. E-mail: hunter{at}salk.edu.

{dagger} These authors contributed equally to this work.

Molecular and Cellular Biology, July 2005, p. 5363-5379, Vol. 25, No. 13
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.13.5363-5379.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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