Trp-tRNA synthetase bridges DNA-PKcs to PARP-1 to link IFN-γ and p53 signaling.

Trp-tRNA synthetase bridges DNA-PKcs to PARP-1 to link IFN-γ and p53 signaling.
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DOI:
10.1038/nchembio.937
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发表时间:
2012-04-15
影响因子:
14.8
通讯作者:
Schimmel, Paul
Schimmel, Paul
中科院分区:
生物学1区
文献类型:
--
作者:
Sajish, Mathew;Zhou, Quansheng;Kishi, Shuji;Valdez, Delgado M., Jr.;Kapoor, Mili;Guo, Min;Lee, Sunhee;Kim, Sunghoon;Yang, Xiang-Lei;Schimmel, Paul

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IFN-γ产生强的抗增殖反应,部分通过激活p53。然而,长期以来已知的IFN-γ依赖性上调人Trp-tRNA合成酶(TrpRS),一种在蛋白质合成的第一步中激活色氨酸形成Trp-AMP的细胞质酶,是无法解释的。在这里,我们报告的TrpRS与DNA依赖性蛋白激酶(DNA-PKcs)的催化亚基和聚(ADP-核糖)聚合酶1(PARP-1),在人类细胞中的主要PARP的核复合物。IFN-γ依赖的DNA-PKcs的聚(ADP-核糖基)化(激活其激酶功能)和伴随的p53激活被Trp-SA特异性阻止,Trp-SA是Trp-AMP的类似物,其破坏TrpRS/DNA-PKcs/PARP-1复合物。在脊椎动物系统中证实了TrpRS与体内p53信号传导的连接。这些和进一步的结果表明,一个令人惊讶的进化扩展的蛋白质合成装置的核作用,连接主要的信号通路。
IFN-γ engenders strong anti-proliferative responses, in part through activation of p53. However, the long-known IFN-γ-dependent upregulation of human Trp-tRNA synthetase (TrpRS), a cytoplasmic enzyme that activates tryptophan to form Trp-AMP in the first step of protein synthesis, is unexplained. Here we report a nuclear complex of TrpRS with the catalytic subunit of DNA-dependent protein kinase (DNA-PKcs) and with poly (ADP-ribose) polymerase 1 (PARP-1), the major PARP in human cells. The IFN-γ-dependent poly (ADP-ribosyl)ation of DNA-PKcs (which activates its kinase function) and concomitant activation of p53 were specifically prevented by Trp-SA, an analog of Trp-AMP that disrupted the TrpRS/DNA-PKcs/PARP-1 complex. The connection of TrpRS to p53 signaling in vivo was confirmed in a vertebrate system. These and further results suggest a surprising evolutionary expansion of the protein synthesis apparatus to a nuclear role that links major signaling pathways.
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