Polo-like kinase 3 regulates CtIP during DNA double-strand break repair in G1.
Polo-like kinase 3 regulates CtIP during DNA double-strand break repair in G1.
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DOI:
10.1083/jcb.201401146
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发表时间:
2014-09-29
期刊:
影响因子:
--
通讯作者:
Löbrich M
中科院分区:
文献类型:
--
作者:
Barton O;Naumann SC;Diemer-Biehs R;Künzel J;Steinlage M;Conrad S;Makharashvili N;Wang J;Feng L;Lopez BS;Paull TT;Chen J;Jeggo PA;Löbrich M
Plk3 phosphorylates CtIP in G1 in a damage-inducible manner and is required with CtIP for the repair of complex double-strand breaks and regulation of resection-mediated end-joining pathways. DNA double-strand breaks (DSBs) are repaired by nonhomologous end joining (NHEJ) or homologous recombination (HR). The C terminal binding protein–interacting protein (CtIP) is phosphorylated in G2 by cyclin-dependent kinases to initiate resection and promote HR. CtIP also exerts functions during NHEJ, although the mechanism phosphorylating CtIP in G1 is unknown. In this paper, we identify Plk3 (Polo-like kinase 3) as a novel DSB response factor that phosphorylates CtIP in G1 in a damage-inducible manner and impacts on various cellular processes in G1. First, Plk3 and CtIP enhance the formation of ionizing radiation-induced translocations; second, they promote large-scale genomic deletions from restriction enzyme-induced DSBs; third, they are required for resection and repair of complex DSBs; and finally, they regulate alternative NHEJ processes in Ku−/− mutants. We show that mutating CtIP at S327 or T847 to nonphosphorylatable alanine phenocopies Plk3 or CtIP loss. Plk3 binds to CtIP phosphorylated at S327 via its Polo box domains, which is necessary for robust damage-induced CtIP phosphorylation at S327 and subsequent CtIP phosphorylation at T847.
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DOI:
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