Interaction of the Influenza A Virus NS1 Protein with the 5'-m7G-mRNA·eIF4E·eIF4G1 Complex.

Interaction of the Influenza A Virus NS1 Protein with the 5'-m7G-mRNA·eIF4E·eIF4G1 Complex.
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DOI:
10.1021/acs.biochem.2c00019
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发表时间:
2022-07-19
期刊:
影响因子:
2.9
通讯作者:
Joseph, Simpson
Joseph, Simpson
中科院分区:
生物学3区
文献类型:
--
作者:
Cruz, Alejandro;Joseph, Simpson

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甲型流感病毒是季节性流行病的罪魁祸首,每年在全世界造成数十万人死亡。甲型流感病毒(NS 1)的非结构蛋白在感染过程中对宿主产生各种拮抗作用。这些过程包括抑制宿主干扰素系统、抑制细胞凋亡反应和增强病毒mRNA翻译,所有这些都有助于甲型流感病毒的总体毒力。尽管NS 1刺激翻译的机制尚不清楚,但已显示NS 1结合多聚腺苷酸结合蛋白1(PABP 1)和真核起始因子G1(eIF 4G 1),这两种蛋白是帽依赖性翻译所必需的。我们在5 '-m7 G-mRNA·eIF 4 E·eIF 4G 1复合物的背景下直接分析了NS 1和eIF 4G 1之间的相互作用。有趣的是,我们的研究表明,在存在或不存在5 '-m7 G-mRNA的情况下,NS 1可以结合该复合物。此外,我们有兴趣研究NS 1是否与eIF 4 E直接相互作用。我们的研究结果表明,NS 1只能在5 '-m7 G-mRNA不存在的情况下与eIF 4 E结合。考虑到以前的数据,我们提出,NS 1刺激翻译结合eIF 4G 1和招聘的43 S翻译前起始复合物的mRNA。
The influenza A virus is responsible for seasonal epidemics that result in hundreds of thousands of deaths worldwide annually. The non-structural protein of the influenza A virus (NS1) inflicts various antagonistic processes on the host during infection. These processes include inhibition of the host interferon system, inhibition of the apoptotic response, and enhancement of viral mRNA translation, all of which contribute to the overall virulence of the influenza A virus. Although the mechanism by which NS1 stimulates translation is unknown, NS1 has been shown to bind both Poly-A Binding Protein 1 (PABP1) and Eukaryotic Initiation Factor G1 (eIF4G1), two proteins necessary for cap-dependent translation. We directly analyzed the interaction between NS1 and eIF4G1 within the context of the 5’-m7G-mRNA•eIF4E•eIF4G1 complex. Interestingly, our studies show that NS1 can bind this complex in the presence or absence of 5’-m7G-mRNA. Additionally, we were interested in investigating whether NS1 interacts with eIF4E directly. Our results indicate NS1 can bind to eIF4E only in the absence of 5’-m7G-mRNA. Considering previous data, we propose that NS1 stimulates translation by binding to eIF4G1 and recruiting the 43S pre-translation initiation complex to the mRNA.
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