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Recombinant Sindbis virus expressing functionalGFP in the nonstructural protein nsP3

机译:在非结构蛋白nsP3中表达功能性GFP的重组Sindbis病毒

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Sindbis virus vectors usually express foreign genes cloned in the structural region of the viral genome. In this report, we tested the possibility of expressing genes in the nonstructural region. We made a recombinant virus with a GFP gene inserted in the nsP3 sequence. The resulting Toto1101/GFP virus was infectious and grew to the same high titer as the parental virus. The nsP3-GFP fusion protein, like nsP3 itself, was phosphorylated. With confocal fluorescence microscopy, we found that nsP3-GFP, as a component of viral RNA replication complex, was on the plasma membrane early in infection (2 h post-infection), but quickly moved to punctate intracellular structures and remained there throughout the course of infection. The observed fluorescence indicates that GFP is functionally expressed in this nonstructural region and other marker or therapeutic genes should be able to be expressed in the same fashion, thus improving the utility of these viral vectors.
机译:Sindbis病毒载体通常表达克隆在病毒基因组结构区域中的外源基因。在这份报告中,我们测试了在非结构区域表达基因的可能性。我们用nsP3序列中插入的GFP基因制成了重组病毒。所得的Toto1101 / GFP病毒具有感染力,并与亲本病毒一样具有高滴度。 nsP3-GFP融合蛋白与nsP3本身一样被磷酸化。通过共聚焦荧光显微镜,我们发现nsP3-GFP是病毒RNA复制复合物的一个组成部分,在感染初期(感染后2小时)位于质膜上,但是很快移动到点状细胞内结构,并在整个过程中保持在那里感染。观察到的荧光表明GFP在该非结构性区域中功能性表达,并且其他标记物或治疗性基因应该能够以相同的方式表达,从而提高了这些病毒载体的效用。

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