Replication and trafficking of a plant virus are coupled at the entrances of plasmodesmata.

Replication and trafficking of a plant virus are coupled at the entrances of plasmodesmata.
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DOI:
10.1083/jcb.201304003
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发表时间:
2013-06-24
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Oparka KJ
Oparka KJ
中科院分区:
其他
文献类型:
--
作者:
Tilsner J;Linnik O;Louveaux M;Roberts IM;Chapman SN;Oparka KJ

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植物病毒运动蛋白在胞间连丝处将复制复合物区室化,用于定位RNA合成和病毒在细胞之间的定向运输。植物病毒利用运动蛋白(MP)来修饰称为胞间连丝(PD)的细胞间孔,以穿过植物细胞壁。许多病毒编码一组保守的三个MP,称为三重基因块(TGB),以马铃薯X病毒(PVX)为代表。在本文中,使用活细胞成像的病毒RNA(vRNA)和病毒编码的蛋白质,我们表明,TGB蛋白在运动过程中有不同的功能。TGB 2和TGB 3在PD孔处建立了内质网衍生的膜帽。这些帽含有PVX复制酶和非固定化的vRNA,代表PD锚定的病毒复制位点。TGB 1介导病毒外壳蛋白插入PD,可能是通过与新生病毒粒子的5 ′端相互作用,并通过TGB 2/3复合物募集到PD。我们提出了一种新的植物病毒运动模型,我们称之为coreplicational插入,其中MP功能区室化复制复合物在PD的本地化RNA合成和细胞之间的病毒定向运输。
Plant virus movement proteins compartmentalize replication complexes at plasmodesmata for localized RNA synthesis and directional trafficking of the virus between cells. Plant viruses use movement proteins (MPs) to modify intercellular pores called plasmodesmata (PD) to cross the plant cell wall. Many viruses encode a conserved set of three MPs, known as the triple gene block (TGB), typified by Potato virus X (PVX). In this paper, using live-cell imaging of viral RNA (vRNA) and virus-encoded proteins, we show that the TGB proteins have distinct functions during movement. TGB2 and TGB3 established endoplasmic reticulum–derived membranous caps at PD orifices. These caps harbored the PVX replicase and nonencapsidated vRNA and represented PD-anchored viral replication sites. TGB1 mediated insertion of the viral coat protein into PD, probably by its interaction with the 5′ end of nascent virions, and was recruited to PD by the TGB2/3 complex. We propose a new model of plant virus movement, which we term coreplicational insertion, in which MPs function to compartmentalize replication complexes at PD for localized RNA synthesis and directional trafficking of the virus between cells.
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