精氨酸甲基转移酶 6 在植物抗病毒免疫中起介导作用

IF 20.6 1区 医学 Q1 MICROBIOLOGY Cell host & microbe Pub Date : 2024-08-05 DOI:10.1016/j.chom.2024.07.014
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引用次数: 0

摘要

病毒抑制RNA沉默(VSR)对成功感染至关重要。据报道,基于核苷酸结合和富亮氨酸重复序列(NLR)以及自噬介导的免疫反应可将 VSR 作为反防御策略的目标。在这里,我们报告了一种由精氨酸甲基转移酶6(PRMT6)介导的针对VSR的防御机制。在番茄灌木枯萎病病毒(TBSV)感染过程中,PRMT6 在番茄植株中的敲除和过表达分别导致病害症状的增强和减轻。PRMT6 通过甲基化 TBSV P19 的关键精氨酸残基 R43 和 R115,与 TBSV P19 相互作用并抑制其 VSR 功能,从而降低其二聚化和小 RNA 结合活性。对天然番茄种群的分析表明,与 PRMT6 高水平和低水平表达相关的两个主要等位基因分别与高水平和低水平的病毒抗性显著相关。我们的研究确定了 PRMT6 介导的 VSR 精氨酸甲基化是植物抗病毒免疫的一种机制。
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Protein arginine methyltransferase 6 mediates antiviral immunity in plants

Viral suppressor RNA silencing (VSR) is essential for successful infection. Nucleotide-binding and leucine-rich repeat (NLR)-based and autophagy-mediated immune responses have been reported to target VSR as counter-defense strategies. Here, we report a protein arginine methyltransferase 6 (PRMT6)-mediated defense mechanism targeting VSR. The knockout and overexpression of PRMT6 in tomato plants lead to enhanced and reduced disease symptoms, respectively, during tomato bush stunt virus (TBSV) infection. PRMT6 interacts with and inhibits the VSR function of TBSV P19 by methylating its key arginine residues R43 and R115, thereby reducing its dimerization and small RNA-binding activities. Analysis of the natural tomato population reveals that two major alleles associated with high and low levels of PRMT6 expression are significantly associated with high and low levels of viral resistance, respectively. Our study establishes PRMT6-mediated arginine methylation of VSR as a mechanism of plant immunity against viruses.

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来源期刊
Cell host & microbe
Cell host & microbe 生物-微生物学
CiteScore
45.10
自引率
1.70%
发文量
201
审稿时长
4-8 weeks
期刊介绍: Cell Host & Microbe is a scientific journal that was launched in March 2007. The journal aims to provide a platform for scientists to exchange ideas and concepts related to the study of microbes and their interaction with host organisms at a molecular, cellular, and immune level. It publishes novel findings on a wide range of microorganisms including bacteria, fungi, parasites, and viruses. The journal focuses on the interface between the microbe and its host, whether the host is a vertebrate, invertebrate, or plant, and whether the microbe is pathogenic, non-pathogenic, or commensal. The integrated study of microbes and their interactions with each other, their host, and the cellular environment they inhabit is a unifying theme of the journal. The published work in Cell Host & Microbe is expected to be of exceptional significance within its field and also of interest to researchers in other areas. In addition to primary research articles, the journal features expert analysis, commentary, and reviews on current topics of interest in the field.
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