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Title
Japanese: 
English:Srs2 plays a critical role in reversible G<inf>2</inf> arrest upon chronic and low doses of uv irradiation via two distinct homologous recombination-dependent mechanisms in postreplication repair-deficient cells 
Author
Japanese: 菱田卓, Hirade, Y., Haruta, N., Kubota, Y., 岩崎博史.  
English: Takashi Hishida, Hirade, Y., Haruta, N., Kubota, Y., Hiroshi Iwasaki.  
Language English 
Journal/Book name
Japanese:Molecular and Cellular Biology 
English:Molecular and Cellular Biology 
Volume, Number, Page Vol. 30    No. 20    pp. 4840-4850
Published date Aug. 2010 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
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Official URL http://www.scopus.com/inward/record.url?eid=2-s2.0-78049384988&partnerID=MN8TOARS
 
DOI https://doi.org/10.1128/MCB.00453-10
Abstract Differential posttranslational modification of proliferating cell nuclear antigen (PCNA) by ubiquitin or SUMO plays an important role in coordinating the processes of DNA replication and DNA damage tolerance. Previously it was shown that the loss of RAD6-dependent error-free postreplication repair (PRR) results in DNA damage checkpoint-mediated G2 arrest in cells exposed to chronic low-dose UV radiation (CLUV), whereas wild-type and nucleotide excision repair-deficient cells are largely unaffected. In this study, we report that suppression of homologous recombination (HR) in PRR-deficient cells by Srs2 and PCNA sumoylation is required for checkpoint activation and checkpoint maintenance during CLUV irradiation. Cyclin-dependent kinase (CDK1)-dependent phosphorylation of Srs2 did not influence checkpoint-mediated G2 arrest or maintenance in PRR-deficient cells but was critical for HR-dependent checkpoint recovery following release from CLUV exposure. These results indicate that Srs2 plays an important role in checkpoint-mediated reversible G2 arrest in PRR-deficient cells via two separate HR-dependent mechanisms. The first (required to suppress HR during PRR) is regulated by PCNA sumoylation, whereas the second (required for HR-dependent recovery following CLUV exposure) is regulated by CDK1-dependent phosphorylation.

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