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Molecular and Cellular Biology, February 2000, p. 1254-1262, Vol. 20, No. 4
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Characterization of Schizosaccharomyces pombe Hus1: a PCNA-Related Protein That Associates with Rad1 and Rad9

Thomas Caspari,1 Maria Dahlen,2 Gunilla Kanter-Smoler,2 Howard D. Lindsay,1 Kay Hofmann,3 Konstantinos Papadimitriou,1 Per Sunnerhagen,2 and Antony M. Carr1,*

MRC Cell Mutation Unit, University of Sussex, Brighton BN1 9RR, United Kingdom1; Department of Molecular Biology, Lundberg Laboratory, Göteborg University, S-413 90 Göteborg, Sweden2; and MEMOREC Stoffel GmbH, D-50829 Cologne, Germany3

Received 11 August 1999/Returned for modification 21 September 1999/Accepted 12 November 1999

Hus1 is one of six checkpoint Rad proteins required for all Schizosaccharomyces pombe DNA integrity checkpoints. MYC-tagged Hus1 reveals four discrete forms. The main form, Hus1-B, participates in a protein complex with Rad9 and Rad1, consistent with reports that Rad1-Hus1 immunoprecipitation is dependent on the rad9+ locus. A small proportion of Hus1-B is intrinsically phosphorylated in undamaged cells and more becomes phosphorylated after irradiation. Hus1-B phosphorylation is not increased in cells blocked in early S phase with hydroxyurea unless exposure is prolonged. The Rad1-Rad9-Hus1-B complex is readily detectable, but upon cofractionation of soluble extracts, the majority of each protein is not present in this complex. Indirect immunofluorescence demonstrates that Hus1 is nuclear and that this localization depends on Rad17. We show that Rad17 defines a distinct protein complex in soluble extracts that is separate from Rad1, Rad9, and Hus1. However, two-hybrid interaction, in vitro association and in vivo overexpression experiments suggest a transient interaction between Rad1 and Rad17.

* Corresponding author. Mailing address: MRC Cell Mutation Unit, Brighton BN1 9RR, United Kingdom. Phone: 0044-1273-678-122. Fax: 0044-1273-678-121. E-mail: a.m.carr{at}sussex.ac.uk.

Molecular and Cellular Biology, February 2000, p. 1254-1262, Vol. 20, No. 4
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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