IFIT3的RNA结合活性促进了流感A病毒的感染和翻译效率
bioRxiv : the preprint server for biology
|March 3, 2025
概括
具有四基重复 (IFIT) 的干扰素诱导蛋白质可以促进流感A病毒 (IAV) 复制. 这项研究表明,IFIT3直接结合RNA,这一功能对于增强病毒基因表达和转化至关重要.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 宿主细胞利用抗病毒因素,包括具有四基重复 (IFIT) 的干扰素诱导蛋白,以对抗病毒感染.
- IFIT2和IFIT3已被确定为流感A病毒 (IAV) 感染期间的亲病毒宿主因素,与它们的典型抗病毒作用相反.
- 在IAV感染期间,IFIT2增强了宿主和病毒mRNA的翻译,促进了病毒复制.
研究的目的:
- 研究IFIT3的RNA结合能力及其在IAV感染期间的功能意义.
- 为了确定IFIT3上的RNA结合部位,并确定它是否保存.
- 阐明IFIT3的RNA结合能力及其在调节宿主和病毒mRNA转化中的作用之间的关系.
主要方法:
- 使用电移动转移试验 (EMSA) 来验证IFIT3.3的直接RNA结合.
- 进行了RNA结合部位识别 (RBS-ID) 实验,以绘制RNA结合表面的地图.
- 确定RNA结合部位的部位定向突变发生进行了,随后进行了共同免疫沉以评估二分化和功能测试以评估翻译调制.
主要成果:
- 通过IFIT3直接结合RNA被证实.
- 在IFIT3上确定了一个进化保守的RNA结合表面,与IFIT2共享.
- IFIT3RNA结合部位的突变显著降低了其提高IAV基因表达和翻译效率的能力.
- 影响RNA结合部位的突变没有破坏IFIT3二分化.
结论:
- 这项研究表明,IFIT3通过保留的表面直接结合RNA.
- IFIT3的RNA结合活性对于其促进IAV基因表达和翻译的功能至关重要.
- 这些发现将IFIT3RNA结合与其作为一种亲病毒因子的作用联系起来,该因子在IAV感染期间调节宿主和病毒mRNA翻译.
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