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DDK Phosphorylates checkpoint clamp component Rad9 and promotes its release from damaged chromatin

journal contribution
posted on 2023-06-08, 08:02 authored by Kanji Furuya, Izumi Miyabe, Yasuhiro Tsutsui, Francesca Paderi, Naoko Kakusho, Hisao Masai, Hironori Niki, Antony CarrAntony Carr
When inappropriate DNA structures arise, they are sensed by DNA structure-dependent checkpoint pathways and subsequently repaired. Recruitment of checkpoint proteins to such structures precedes recruitment of proteins involved in DNA metabolism. Thus, checkpoints can regulate DNA metabolism. We show that fission yeast Rad9, a 9-1-1 heterotrimeric checkpoint-clamp component, is phosphorylated by Hsk1(Cdc7), the Schizosaccharomyces pombe Dbf4-dependent kinase (DDK) homolog, in response to replication-induced DNA damage. Phosphorylation of Rad9 disrupts its interaction with replication protein A (RPA) and is dependent on 9-1-1 chromatin loading, the Rad9-associated protein Rad4/Cut5(TopBP1), and prior phosphorylation by Rad3(ATR). rad9 mutants defective in DDK phosphorylation show wild-type checkpoint responses but abnormal DNA repair protein foci and decreased viability after replication stress. We propose that Rad9 phosphorylation by DDK releases Rad9 from DNA damage sites to facilitate DNA repair.

History

Publication status

  • Published

Journal

Molecular Cell

ISSN

1097-2765

Publisher

Elsevier

Issue

4

Volume

40

Page range

606-618

Department affiliated with

  • Sussex Centre for Genome Damage Stability Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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