科研动态

羊口疮（传染性脓疱）和小反刍兽疫的病原体分别为羊口疮病毒（orf virus，ORFV）和小反刍兽疫病毒（peste despetits ruminants virus，PPRV）。如果通过反向遗传技术进行基因修饰，PPRV可成为表达外源蛋白的有效载体。ORFV含有1个具有高免疫原性的B2L蛋白。本研究首先构建了含B2L基因开放阅读框的重组PPRV cDNA clone，然后通过反向遗传技术，拯救了一株表达B2L蛋白的重组PPRV。试验表明，该重组病毒的生长动力学类似其母源病毒；Western blot和质谱分析表明，该重组PPRV可在细胞内表达B2L蛋白。该研究为羊口疮和小反刍兽疫二联疫苗的研制奠定了基础。

Rescue of Recombinant Peste des PetitsRuminants Virus for Expressing Orf Virus B2L Protein

Orf（contagiousecthyma）and peste des petits ruminants（PPR）are caused byorf virus（ORFV）and peste despetits ruminants virus（PPRV），respectively. If genetically modifiedby reverse genetics tool，the PPRV wouldbe a useful vector to express foreign proteins. The ORFV contains a highlyimmunogenic envelope protein，B2L protein.In this study，a recombinant PPRV cDNA clone，which contained the B2L gene openreading frame，was rescued using reverse genetics toexpress the B2L protein. This recombinant PPRV was demonstrated to have similargrowth kinetics to that of its parental virus. In vitro expression of the B2Lprotein by it was demonstrated by Western blot and confirmed by massspectrometry，therefore paving the way fordevelopment of a bivalent vaccine candidate against both diseases.

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