Tombusvirus replication depends on Sec39p endoplasmic reticulum-associated transport protein.

Tombusvirus replication depends on Sec39p endoplasmic reticulum-associated transport protein.
复制标题

Tombusvirus 的复制依赖于 Sec39p 内质网相关转运蛋白。

DOI:
10.1016/j.virol.2013.07.039
复制
发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
P. D. Nagy
P. D. Nagy
中科院分区:
医学3区
文献类型:
--
作者:
Z. Sasvári;Paulina Alatriste Gonzalez;R. Rachubinski;P. D. Nagy

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正链RNA病毒破坏亚细胞膜,在感染细胞中构建病毒复制酶复合物(VRC)。Tombusviruses使用过氧化物酶体膜来组装它们的VRC,并且它们可以在不存在过氧化物酶体的情况下有效地转换到内质网膜。在本文中,我们表明,ER驻留Sec39p囊泡转运蛋白是至关重要的活性VRC在酵母模型宿主的形成。Sec39p在酵母或植物中的表达的抑制导致大大减少的番茄丛矮病毒积累。此外,从Sec39p缺失的酵母细胞中纯化的番茄丛矮病毒复制酶显示出低的体外活性。此外,在无细胞提取物或在分离的ER膜与压抑Sec39p表达的酵母中,番茄丛矮病毒RNA复制差。当Sec39p在酵母中耗尽时,Tombusvirus p33复制蛋白错误定位于ER。总的来说,Sec39p是第一个过氧化物酶体生物合成蛋白,其特征在于对番茄丛矮病毒在酵母和植物中的复制至关重要。
Positive-stranded RNA viruses subvert subcellular membranes to built viral replicases complexes (VRCs) in infected cells. Tombusviruses use peroxisomal membranes for the assembly of their VRCs and they can efficiently switch to the endoplasmic reticulum membrane in the absence of peroxisomes. In this paper, we show that the ER-resident Sec39p vesicular transport protein is critical for the formation of active VRCs in yeast model host. Repression of Sec39p expression in yeast or in plants resulted in greatly reduced tombusvirus accumulation. Moreover, the purified tombusvirus replicase from Sec39p-depleted yeast cells showed lowin vitroactivity. Also, tombusvirus RNA replication was poor in cell-free extracts or in isolated ER membranes from yeast with repressed Sec39p expression. The tombusvirus p33 replication protein was mislocalized to the ER when Sec39p was depleted in yeast. Overall, Sec39p is the first peroxisomal biogenesis protein characterized that is critical for tombusvirus replication in yeast and plants.
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