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RNA Modulates the Interaction between Influenza A Virus NS1 and Human PABP1

机译:RNA调节流感病毒NS1和人类PABP1之间的相互作用

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摘要

Nonstructural protein 1 (NS1) is a multifunctional protein involved in preventing host-interferon response in influenza A virus (IAV). Previous studies have indicated that NS1 also stimulates the translation of viral mRNA by binding to conserved sequences in the viral 5'-UTR. Additionally, NS1 binds to poly(A) binding protein 1 (PABP1) and eukaryotic initiation factor 4G (eIF4G). The interaction of NS1 with the viral 5'-UTR, PABP1, and eIF4G has been suggested to specifically enhance the translation of viral mRNAs. In contrast, we report that NS1 does not directly bind to sequences in the viral 5'-UTR, indicating that NS1 is not responsible for providing the specificity to stimulate viral mRNA translation. We also monitored the interaction of NS1 with PABP1 using a new, quantitative FRET assay. Our data show that NS1 binds to PABP1 with high affinity; however, the binding of double-stranded RNA (dsRNA) to NS1 weakens the binding of NS1 to PABP1. Correspondingly, the binding of PABP1 to NS1 weakens the binding of NS1 to double-stranded RNA (dsRNA). In contrast, the affinity of PABP1 for binding to poly(A) RNA is not significantly changed by NS1. We propose that the modulation of NS1. PABP1 interaction by dsRNA may be important for the viral cycle.
机译:非结构蛋白1(NS1)是一种多官能蛋白,参与在流感病毒(IAV)中预防宿主干扰素应答。以前的研究表明,NS1还通过与病毒5'-UTR中的保守序列结合来刺激病毒mRNA的翻译。另外,NS1与聚(a)结合蛋白1(PABP1)和真核引发因子4G(EIF4G)结合。已经提出了NS1与病毒5'-UTR,PABP1和EIF4G的相互作用以特异性增强病毒MRNA的翻译。相反,我们报告说NS1不直接与病毒5'--UTR中的序列结合,表明NS1不责任提供刺激病毒mRNA翻译的特异性。我们还使用新的定量FRET测定监测NS1与PABP1的相互作用。我们的数据显示NS1与高亲和力的PABP1结合;然而,双链RNA(dsRNA)至NS1的结合削弱了NS1至PABP1的结合。相应地,PABP1至NS1的结合削弱了NS1与双链RNA(DSRNA)的结合。相反,通过NS1不会显着改变pABP1与聚(a)RNA结合的亲和力。我们提出了NS1的调制。 DSRNA的PABP1对病毒循环可能是重要的。

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  • 来源
    《Biochemistry》 |2018年第26期|共9页
  • 作者单位

    Univ Calif San Diego Dept Biol Sci 9500 Gilman Dr La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Chem &

    Biochem 9500 Gilman Dr La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Chem &

    Biochem 9500 Gilman Dr La Jolla CA 92093 USA;

    Univ Calif San Diego Dept Chem &

    Biochem 9500 Gilman Dr La Jolla CA 92093 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;
  • 关键词

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