The Arabidopsis RRM domain protein EDM3 mediates race-specific disease resistance by controlling H3K9me2-dependent alternative polyadenylation of RPP7 immune receptor transcripts.

The Arabidopsis RRM domain protein EDM3 mediates race-specific disease resistance by controlling H3K9me2-dependent alternative polyadenylation of RPP7 immune receptor transcripts.
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DOI:
10.1111/tpj.14148
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发表时间:
2019-03
期刊:
The Plant journal : for cell and molecular biology
影响因子:
--
通讯作者:
Eulgem T
Eulgem T
中科院分区:
其他
文献类型:
--
作者:
Lai Y;Cuzick A;Lu XM;Wang J;Katiyar N;Tsuchiya T;Le Roch K;McDowell JM;Holub E;Eulgem T

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nlr受体RPP7介导拟南芥种族特异性免疫。先前对增强型霜霉病(edm)突变体的筛选发现,共同伴侣SGT1b (EDM1)和博士指蛋白EDM2是RPP7的关键调节因子。在这里,我们描述了RPP7免疫受损的第三个edm突变体edm3。EDM3编码一个具有rna识别基序的核定位蛋白。与EDM2一样,EDM3在RPP7位点促进组蛋白H3赖氨酸9二甲基化(H3K9me2)。H3K9me2的全局分析显示,EDM3影响了大量位点上的沉默标记。重要的是,EDM3和EDM2在体内都与h3k9me2标记的染色质和RPP7关键近端聚腺苷化位点的转录物共同作用,在那里它们抑制近端转录物的聚腺苷化/终止。我们的研究结果强调了植物NLR基因调控的复杂性,并在组蛋白标记和NLR转录物加工之间建立了功能和物理联系。
The NLR-receptor RPP7 mediates race-specific immunity in Arabidopsis. Previous screens for enhanced downy mildew (edm) mutants identified the co-chaperone SGT1b (EDM1) and the PHD-finger protein EDM2 as critical regulators of RPP7. Here, we describe a third edm mutant compromised in RPP7 immunity, edm3. EDM3 encodes a nuclear-localized protein featuring an RNA-recognition motif. Like EDM2, EDM3 promotes histone H3 lysine 9 dimethylation (H3K9me2) at RPP7. Global profiling of H3K9me2 showed EDM3 to affect this silencing mark at a large set of loci. Importantly, both EDM3 and EDM2 co-associate in vivo with H3K9me2-marked chromatin and transcripts at a critical proximal polyadenylation site of RPP7, where they suppress proximal transcript polyadeylation/termination. Our results highlight the complexity of plant NLR gene regulation, and establish a functional and physical link between a histone mark and NLR-transcript processing.
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