S-nitrosylation of the zinc finger protein SRG1 regulates plant immunity.

S-nitrosylation of the zinc finger protein SRG1 regulates plant immunity.
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锌指蛋白 SRG1 的 S-亚硝基化可调节植物免疫。

DOI:
10.1038/s41467-018-06578-3
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发表时间:
2018-10-12
影响因子:
16.6
通讯作者:
Loake GJ
Loake GJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Cui B;Pan Q;Clarke D;Villarreal MO;Umbreen S;Yuan B;Shan W;Jiang J;Loake GJ

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一氧化氮(NO)协调过多的不一致的植物免疫反应,包括全球基因表达的重编程。然而,同源的分子机制在很大程度上仍然未知。在这里,我们表明锌指转录因子(ZF-TF),SRG 1,是一个中心的NO生物活性在植物免疫过程中,它作为一个积极的调节器。NO积累促进SRG 1表达,随后SRG 1占据靶启动子内的重复典型序列。SRG 1的结构域使其能够募集辅阻遏物TOPLESS,从而抑制靶基因的表达。持续的NO合成驱动SRG 1 S-亚硝基化主要在Cys 87,缓解SRG 1 DNA结合和转录抑制活性。因此,Cys 87的突变损害了NO介导的SRG 1依赖性转录抑制的控制。因此,SRG 1-SNO的形成可能有助于减弱植物免疫应答的负反馈回路。SRG 1 Cys 87在进化上是保守的,因此可能是ZF-TF功能的氧化还原调节的靶点。在病原体感染时,植物积累一氧化氮,随后调节防御基因的表达。在这里,作者表明,锌指转录因子SRG 1的S-亚硝基化影响转录抑制,并有助于激活防御反应。
Nitric oxide (NO) orchestrates a plethora of incongruent plant immune responses, including the reprograming of global gene expression. However, the cognate molecular mechanisms remain largely unknown. Here we show a zinc finger transcription factor (ZF-TF), SRG1, is a central target of NO bioactivity during plant immunity, where it functions as a positive regulator. NO accumulation promotes SRG1 expression and subsequently SRG1 occupies a repeated canonical sequence within target promoters. An EAR domain enables SRG1 to recruit the corepressor TOPLESS, suppressing target gene expression. Sustained NO synthesis drives SRG1 S-nitrosylation predominantly at Cys87, relieving both SRG1 DNA binding and transcriptional repression activity. Accordingly, mutation of Cys87 compromises NO-mediated control of SRG1-dependent transcriptional suppression. Thus, the SRG1-SNO formation may contribute to a negative feedback loop that attenuates the plant immune response. SRG1 Cys87 is evolutionary conserved and thus may be a target for redox regulation of ZF-TF function across phylogenetic kingdoms. Upon pathogen infection plants accumulate nitric oxide which subsequently regulates defence gene expression. Here, the authors show that S-nitrosylation of the zinc finger transcription factor SRG1 affects transcriptional suppression and contributes to activation of defence responses.
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