一个病毒效应器阻止了植物NLR受体的周转,从而触发了强大的免疫反应
Chunli Wang1, Min Zhu1, Hao Hong1
1The Key Laboratory of Plant Immunity, Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, P. R. China.
植物免疫受体 (NLR) 保持在低水平,但激活强大的防御. 一个病毒效应器扰乱了NLR调节,稳定了受体,触发了对番茄斑点枯病毒的免疫力.
科学领域:
- 植物免疫和分子生物学
- 植物病原体相互作用
- 蛋白质的调节和信号传递.
背景情况:
- 植物细胞内核酸结合和氨酸丰富的重复免疫受体 (NLRs) 对于病原体防御至关重要.
- 虽然NLR蛋白保持在低基底水平,但它们在效应因子识别时强烈激活的机制尚不清楚.
- 番茄NLR Sw-5b是植物防御特定病原体的关键组成部分.
研究的目的:
- 阐明番茄NLR Sw-5b在无活性和活性状态中的调节机制.
- 了解病毒效应因子如何调节NLR稳定性和免疫激活.
- 研究E3结合酶SBP1在控制Sw-5b水平和功能的作用.
主要方法:
- 通过E3结合酶SBP1.1.介导的Sw-5b的研究泛基化和蛋白质循环.
- 分析了Sw-5b,SBP1和病毒效应器NSm之间的蛋白质-蛋白质相互作用.
- 使用番茄斑病毒的感染试验来研究免疫反应动态.
主要成果:
- 由于没有效应因子,不活跃的Sw-5b经历了缓慢的周转,受到SBP1对其N终端域的约束的调节.
- 活跃的Sw-5b经历了由于SBP1水平的增加和与N-终端和NB-LRR领域的相互作用而快速的周转.
- 病毒效应剂NSm破坏了Sw-5b-SBP1的相互作用,稳定了活跃的Sw-5b,并启动了强烈的免疫反应.
结论:
- SBP1作为Sw-5b的负调节器,控制其稳定性和周转率.
- 病毒效应者可以通过破坏调节蛋白相互作用来克服NLR介导的免疫力.
- 这项研究揭示了在病原体挑战时快速稳定和激活NLR的机制.
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