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在Arabidopsis中识别病原体衍生脂

H Kato¹, K Nemoto², M Shimizu²

¹Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.

Science (New York, N.Y.)

|May 19, 2022

概括

植物免疫受体可以识别微生物脂质. 该Phytophthora infestans-ceramide D (Pi-Cer D) 分子由中性CERAMIDASE 2 (NCER2) 处理,并被RDA2识别以触发防御.

科学领域:

植物免疫力
分子植物病原体相互作用
植物中的脂质信号

背景情况:

植物使用模式识别受体 (PRR) 来检测微生物入侵者并启动防御机制.
病原体的脂质分子可以作为植物免疫反应的关键信号.

研究的目的:

阐明植物识别病原体衍生的脂质的分子机制.
为了确定检测Phytophthora infestans-ceramide D (Pi-Cer D) 的植物受体和酶.

主要方法:

生物化学测定用于研究胺裂变和识别.
使用缺乏NCER2和RDA2的Arabidopsis突变物进行遗传分析.
对病原体耐药性的测定

主要成果:

菌体胺Pi-Cer D会触发Arabidopsis的防御反应.
阿拉比多普西斯中性基酶2 (NCER2) 裂解Pi-Cer D,释放出一个9甲基分支的基.
抗 DFPM 阻断沉酸信号2 (RDA2) 的莱克类似激酶特别识别了这种微生物基,诱导了植物免疫力.
在RDA2或NCER2中的功能丧失突变会降低Arabidopsis对菌病原体的耐药性.

结论:

一个新的植物免疫路径通过酶处理和特定受体结合来识别微生物脂质.
NCER2-RDA2模块是检测病原体衍生的9-甲基分支基的一个关键机制.
这项研究揭示了植物对脂质形式的病原体相关分子模式 (PAMPs) 的重要见解.

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