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  • Src family kinases promote silencing of ATR-Chk1 signaling in termination of DNA damage checkpoint.

Src family kinases promote silencing of ATR-Chk1 signaling in termination of DNA damage checkpoint.

The Journal of biological chemistry (2014-03-19)
Yasunori Fukumoto, Mariko Morii, Takahito Miura, Sho Kubota, Kenichi Ishibashi, Takuya Honda, Aya Okamoto, Noritaka Yamaguchi, Atsushi Iwama, Yuji Nakayama, Naoto Yamaguchi
ABSTRACT

The DNA damage checkpoint arrests cell cycle progression to allow time for repair. Once DNA repair is completed, checkpoint signaling is terminated. Currently little is known about the mechanism by which checkpoint signaling is terminated, and the disappearance of DNA lesions is considered to induce the end of checkpoint signaling; however, here we show that the termination of checkpoint signaling is an active process promoted by Src family tyrosine kinases. Inhibition of Src activity delays recovery from the G2 phase DNA damage checkpoint following DNA repair. Src activity is required for the termination of checkpoint signaling, and inhibition of Src activity induces persistent activation of ataxia telangiectasia mutated (ATM)- and Rad3-related (ATR) and Chk1 kinases. Src-dependent nuclear protein tyrosine phosphorylation and v-Src expression suppress the ATR-mediated Chk1 and Rad17 phosphorylation induced by DNA double strand breaks or DNA replication stress. Thus, Src family kinases promote checkpoint recovery through termination of ATR- and Chk1-dependent G2 DNA damage checkpoint. These results suggest a model according to which Src family kinases send a termination signal between the completion of DNA repair and the initiation of checkpoint termination.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-v-Src (Ab-1) Mouse mAb (327), liquid, clone 327, Calbiochem®
Sigma-Aldrich
Monoclonal Anti-Cyclin A antibody produced in mouse, clone CY-A1, ascites fluid