N-糖化促进了植物细胞表面受体的激活
Fangshuai Jia1,2, Yu Xiao3, Yaojie Feng4
1College of Life Sciences, Henan Normal University, Xinxiang, China.
Nature plants
|November 7, 2024
概括
植物受体激酶 (RKs) 介导免疫. 这项研究揭示了MALE DISCOVERER1-INTERACTING受体类KINASE 2 (MIK2) 如何识别 SERINE-RICH内源性 (SCOOPs) 以及MIK2的N-糖化如何激活植物免疫反应.
科学领域:
- 植物生物学 植物生物学
- 植物免疫的分子机制
- 结构生物学是结构生物学.
背景情况:
- 植物受体激酶 (RKs) 对于植物免疫中的跨膜信号传递至关重要.
- MIK2 (MALE DISCOVERER1-INTERACTING RECEPTOR-LIKE KINASE 2) 识别了SCOOP (SERINE-RICH ENDOGENOUS PEPTIDES) ,从而触发了免疫力. 这就是为什么我们可以使用MIK2来进行检测.
- 目前尚不完全了解SCOOP识别和MIK2激活的确切机制.
研究的目的:
- 阐明SCOOP的MIK2介导识别的结构基础.
- 了解BAK1共受体在MIK2激活中的作用.
- 调查N-糖化对MIK2功能和植物免疫力的影响.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定MIK2-SCOOP12-BAK1复合物的结构.
- 位点定向突变发生,以分析特定基因和糖化位点的功能.
- 评估转基因植物中的植物免疫反应.
主要成果:
- 化EM结构揭示了MIK2的DNHH图案如何识别SCOOP12的SxS图案.
- 在MIK2Asn410的N-甘氨酸与共同受体BAK1.1直接相互作用.
- 突变N410糖化位点破坏了MIK2-BAK1的相互作用,并损害了SCOOP12触发的免疫力.
结论:
- 这项研究揭示了MIK2.2对SCOOP识别的分子机制.
- 对于MIK2与BAK1的相互作用以及随后的植物免疫的激活,MIK2的N-糖化是必不可少的.
- 这些发现为LRR-RK通过N-糖化激活提供了一个新的激活机制.
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