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

Caspari, Thomas and Dahlen, Maria and Kanter-Smoler, Gunilla and Lindsay, Howard D. and Hofmann, Kay and Papadimitriou, Konstantinos and Sunnerhagen, Per and Carr, Antony M. (2000) Characterization of Schizosaccharomyces pombe Hus1: a PCNA-Related Protein That Associates with Rad1 and Rad9. Molecular and Cellular Biology, 20 (4). pp. 1254-1262. ISSN 0270-7306

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Abstract

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.

Item Type: Article
Journal or Publication Title: Molecular and Cellular Biology
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Health and Medicine > Medicine
ID Code: 9444
Deposited By: Dr Howard Lindsay
Deposited On: 10 Jun 2008 11:53
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:37
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9444

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