Structural switch of lysyl-tRNA synthetase between translation and transcription.

Structural switch of lysyl-tRNA synthetase between translation and transcription.
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DOI:
10.1016/j.molcel.2012.10.010
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发表时间:
2013-01-10
期刊:
影响因子:
16
通讯作者:
Guo, Min
Guo, Min
中科院分区:
生物学1区
文献类型:
--
作者:
Ofir-Birin, Yifat;Fang, Pengfei;Bennett, Steven P.;Zhang, Hui-Min;Wang, Jing;Rachmin, Inbal;Shapiro, Ryan;Song, Jing;Dagan, Arie;Pozo, Jorge;Kim, Sunghoon;Marshall, Alan G.;Schimmel, Paul;Yang, Xiang-Lei;Nechushtan, Hovav;Razin, Ehud;Guo, Min

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Lysyl-tRNA合成酶(LysRS)是翻译装置的一个组成部分,从细胞质多trna合成酶复合物(MSC)中释放出来,通过未明确的机制激活受刺激肥大细胞的转录因子MITF。在这里,我们发现ser207磷酸化激发了LysRS的一个新的构象,使其翻译失活,但激活了其转录功能。MSC亚复合物的晶体结构表明,LysRS通过与支架蛋白p38/AIMP2的n端结合而被保留在MSC中。磷酸化在LysRS结构域界面产生的空间冲突破坏了p38/AIMP2的结合槽,释放LysRS并引发其核易位。这种改变也暴露了LysRS的c端结构域与MITF结合,并触发LysRS定向产生激活MITF的第二信使Ap4A。因此,我们的研究结果表明,由磷酸化引发的单一构象变化会导致多种效应,从而驱动LysRS功能从翻译到转录的排他性转换。
Lysyl-tRNA synthetase (LysRS), a component of the translation apparatus, is released from the cytoplasmic multi-tRNA synthetase complex (MSC) to activate the transcription factor MITF in stimulated mast cells through undefined mechanisms. Here we show that Ser207-phosphorylation provokes a new conformer of LysRS that inactivates its translational, but activates its transcriptional function. The crystal structure of an MSC sub-complex established that LysRS is held in the MSC by binding to the N-terminus of the scaffold protein p38/AIMP2. Phosphorylation-created steric clashes at the LysRS domain interface disrupt its binding grooves for p38/AIMP2, releasing LysRS and provoking its nuclear translocation. This alteration also exposes the C-terminal domain of LysRS to bind to MITF and triggers LysRS-directed production of the second messenger Ap4A that activates MITF. Thus our results establish that a single conformational change triggered by phosphorylation leads to multiple effects driving an exclusive switch of LysRS function from translation to transcription.
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