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Molecular and Cellular Biology, September 2003, p. 6150-6158, Vol. 23, No. 17
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.17.6150-6158.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Retention but Not Recruitment of Crb2 at Double-Strand Breaks Requires Rad1 and Rad3 Complexes

Li-Lin Du, Toru M. Nakamura, Bettina A. Moser, and Paul Russell*

Departments of Molecular Biology and Cell Biology, The Scripps Research Institute, La Jolla, California 92037

Received 30 April 2003/ Returned for modification 27 May 2003/ Accepted 5 June 2003

The fission yeast checkpoint protein Crb2, related to budding yeast Rad9 and human 53BP1 and BRCA1, has been suggested to act as an adapter protein facilitating the phosphorylation of specific substrates by Rad3-Rad26 kinase. To further understand its role in checkpoint signaling, we examined its localization in live cells by using fluorescence microscopy. In response to DNA damage, Crb2 localizes to distinct nuclear foci, which represent sites of DNA double-strand breaks (DSBs). Crb2 colocalizes with Rad22 at persistent foci, suggesting that Crb2 is retained at sites of DNA damage during repair. Damage-induced Crb2 foci still form in cells defective in Rad1, Rad3, and Rad17 complexes, but these foci do not persist as long as in wild-type cells. Our results suggest that Crb2 functions at the sites of DNA damage, and its regulated persistent localization at damage sites may be involved in facilitating DNA repair and/or maintaining the checkpoint arrest while DNA repair is under way.

* Corresponding author. Mailing address: The Scripps Research Institute, 10550 North Torrey Pines Rd., La Jolla, CA 92037. Phone: (858) 784-8273. Fax: (858) 784-2265. E-mail: prussell{at}scripps.edu.

Molecular and Cellular Biology, September 2003, p. 6150-6158, Vol. 23, No. 17
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.17.6150-6158.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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