Characterization of Schizosaccharomyces pombe Hus1: a PCNA-Related Protein That Associates with Rad1 and Rad9
| Autor: | Kay Hofmann, Konstantinos Papadimitriou, Thomas Caspari, Antony M. Carr, Gunilla Kanter-Smoler, Per Sunnerhagen, Maria Dahlén, Howard D. Lindsay |
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| Jazyk: | angličtina |
| Rok vydání: | 2000 |
| Předmět: |
Immunoprecipitation
Macromolecular Substances Molecular Sequence Data Cell Cycle Proteins Biology DNA-binding protein Fungal Proteins Proliferating Cell Nuclear Antigen Two-Hybrid System Techniques Schizosaccharomyces medicine Amino Acid Sequence Phosphorylation Molecular Biology Cell Nucleus Fungal protein Sequence Homology Amino Acid Cell Cycle Cell Biology Cell cycle biology.organism_classification Endonucleases Molecular biology DNA Dynamics and Chromosome Structure Cell biology DNA-Binding Proteins Cell nucleus medicine.anatomical_structure Schizosaccharomyces pombe Schizosaccharomyces pombe Proteins biological phenomena cell phenomena and immunity |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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