Abstract
It has been demonstrated that the subcellular location of Tobamovirus movement protein (MP) which was fused with green fluorescent protein (MP:GFP) changed during the infection process. However, the intracellular route through which MP is transported and its biological meaning are still obscure. Treatment with brefeldin A (BFA), which disrupts ER-to-Golgi transport, inhibited the formation of irregularly shaped and filamentous structures of MP. In this condition, MP was still targeted to plasmodesmata in leaf cells. Furthermore, the viral cell-to-cell movement was not inhibited by BFA treatment. These data indicated that the targeting of viral replication complexes (VRCs) to plasmodesmata is mediated by a BFA-insensitive pathway and that the ER-to-Golgi transport pathway is not involved in viral intercellular movement.
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