Ku70型
拓扑异构酶
聚ADP核糖聚合酶
DNA修复
DNA损伤
Ku80型
细胞生物学
DNA
化学
解旋酶
生物
分子生物学
生物化学
聚合酶
DNA结合蛋白
基因
转录因子
核糖核酸
作者
Rajakumar Mandraju,Anil Chekuri,C. Bhaskar,Kerstin Duning,Joachim Kremerskothen,Anand K. Kondapi
标识
DOI:10.1016/j.abb.2011.10.001
摘要
In the present study, the activity of Topoisomerase IIβ (TopoIIβ) is evaluated during peroxide induced double stranded DNA breaks (DSBs) repair in primary neurons. The results showed that the TopoIIβ levels were enhanced during recovery from peroxide mediated damage (PED) along with Ku70, PARP-1, pol beta, and WRN helicase. Furthermore, siRNA mediated knock-down of TopoIIβ in primary neurons conferred enhanced susceptibility to PED in neurons. DSBs in neurons are repaired through two pathways, one promoted by Ku70, while the other is by PARP-1 dependent manner. Participation of TopoIIβ in both pathways was assessed by analysis of the interaction of TopoIIβ with Ku70 and PARP-1 using co-immunoprecipitation experiments in extracts of neurons under peroxide treatment and recovery. The results of these studies showed a strong interaction of TopoIIβ with Ku70 as well as PARP-1 suggesting that TopoIIβ is associated both in Ku70 and PARP-dependent pathways in DSBs repair in primary neurons. The study has thus established that TopoIIβ is an essential component in DSBs repair in primary neurons in both Ku70 and PARP-1 dependent pathways. We suppose that the interaction of TopoIIβ may provide stabilization of the repair complex, which may assist in maintenance of tensional integrity in genomic DNA.
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