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水稻瘤矮病毒S12编码第2个RNA沉默抑制子

, PP. 61-69

Keywords: 水稻瘤矮病毒(RGDV),Pns12,RNA沉默抑制子

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Abstract:

RNA沉默是一种保守而普遍存在于真核生物体内用于调控基因表达和发育的一种机制,也是植物抵抗病毒侵染和转录的一种防御机制.作为一种反防御机制,许多植物病毒编码沉默抑制子.本研究利用农杆菌共浸润的方法发现,RGDV基因组S12片段编码的Pns12蛋白是该病毒的第2个RNA沉默抑制因子.?Pns12能够抑制正义链RNA诱发的局部沉默,但不能抑制由双链RNA诱发的局部沉默,在异源病毒表达载体PVX中,Pns12能够增强PVX对本氏烟草的致病性.上述结果提示,Pns12蛋白为RNA沉默抑制因子,可能作用于RNA沉默路径中dsRNA形成的上游.此外,Pns12亚细胞定位结果显示,Pns12主要定位于烟草表皮细胞的细胞核内,推测该基因可能在细胞核中发挥功能.

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