数字农科院2.0

Pepino mosaic virus antagonizes plant m(6)A modification by promoting the autophagic degradation of the m(6)A writer HAKAI

文献类型： 外文期刊

作者： He, Hao;Ge, Linhao;Li, Zhaolei;Zhou, Xueping;Li, Fangfang

作者机构：

关键词： Pepino mosaic virus;HAKAI;Autophagy;Beclin1

期刊名称： ABIOTECH

ISSN： 2096-6326

年卷期： 2023 年

页码：

收录情况： CSCD（2023-2024年度）

摘要： Autophagy plays an active anti-viral role in plants. Increasing evidence suggests that viruses can inhibit or manipulate autophagy, thereby winning the arms race between plants and viruses. Here, we demonstrate that overexpression of an m(6)A writer from Solanum lycopersicum, SlHAKAI, could negatively regulate pepino mosaic virus (PepMV) infection, inhibit viral RNA and protein accumulations by affecting viral m(6)A levels in tomato plants and vice versa. The PepMV-encoded RNA-dependent RNA polymerase (RdRP) directly interacts with SlHAKAI and reduces its protein accumulation. The RdRP-mediated decreased protein accumulation of SlHAKAI is sensitive to the autophagy inhibitor 3-methyladenine and is compromised by knocking down a core autophagy gene. Furthermore, PepMV RdRP could interact with an essential autophagy-related protein, SlBeclin1. RdRP, SlHAKAI, and SlBeclin1 interaction complexes form bright granules in the cytoplasm. Silencing of Beclin1 in Nicotiana benthamiana plants abolishes the RdRP-mediated degradation of SlHAKAI, indicating the requirement of Beclin1 in this process. This study uncovers that the PepMV RdRP exploits the autophagy pathway by interacting with SlBeclin1 to promote the autophagic degradation of the SlHAKAI protein, thereby inhibiting the m(6)A modification-mediated plant defense responses.

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