The GAIT system: a gatekeeper of inflammatory gene expression.

The GAIT system: a gatekeeper of inflammatory gene expression.
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DOI:
10.1016/j.tibs.2009.03.004
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发表时间:
2009-07
影响因子:
13.8
通讯作者:
Fox, Paul L.
Fox, Paul L.
中科院分区:
生物学1区
文献类型:
--
作者:
Mukhopadhyay, Rupak;Jia, Jie;Arif, Abul;Ray, Partho Sarothi;Fox, Paul L.

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功能相关的基因是由特定的RNA-蛋白质相互作用,直接转录选择性的翻译控制共调节。在骨髓细胞中,干扰素(IFN)-γ诱导异源四聚体、IFN-γ激活的翻译抑制剂(GAIT)复合物的形成,该复合物包含谷氨酰-脯氨酰tRNA合成酶(EPRS)、NS 1相关蛋白1(NSAP 1)、核糖体蛋白L13 a和甘油醛-3-磷酸脱氢酶(GAPDH)。该复合物结合炎性mRNA家族中定义的3′非翻译区元件并抑制其翻译。IFN-γ依赖性磷酸化,以及随后分别从tRNA多合成酶复合物和60 S核糖体亚基释放EPRS和L13 a,调节GAIT复合物组装。EPRS识别并结合靶mRNA,NSAP 1负调节RNA结合,L13 a通过结合真核起始因子4G抑制翻译起始。GAIT系统对转录后调节子的抑制可能有助于慢性炎症的消退。
Functionally related genes are coregulated by specific RNA–protein interactions that direct transcript-selective translational control. In myeloid cells, interferon (IFN)-γ induces formation of the heterotetrameric, IFN-γ-activated inhibitor of translation (GAIT) complex comprising glutamyl-prolyl tRNA synthetase (EPRS), NS1-associated protein 1 (NSAP1), ribosomal protein L13a and glyceraldehyde-3-phosphate dehydrogenase (GAPDH). This complex binds defined 3′ untranslated region elements within a family of inflammatory mRNAs and suppresses their translation. IFN-γ-dependent phosphorylation, and consequent release of EPRS and L13a from the tRNA multisynthetase complex and 60S ribosomal subunit, respectively, regulates GAIT complex assembly. EPRS recognizes and binds target mRNAs, NSAP1 negatively regulates RNA binding, and L13a inhibits translation initiation by binding eukaryotic initiation factor 4G. Repression of a post-transcriptional regulon by the GAIT system might contribute to the resolution of chronic inflammation.
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