通过Ca(2+) 传感器蛋白激酶传递差异性先天免疫信号
Marie Boudsocq1, Matthew R Willmann, Matthew McCormack
1Department of Genetics, Harvard Medical School, Center for Computational and Integrative Biology, Massachusetts General Hospital, Massachusetts 02114, USA.
Nature
|February 19, 2010
概括
植物天生的免疫依赖于依赖的蛋白激酶 (CDPKs) 来感知信号并触发防御反应. 这些CDPK对于微生物关联分子模式 (MAMP) 信号传输期间的转录重编程至关重要.
科学领域:
- 植物生物学 植物生物学
- 免疫学 免疫学 免疫学
- 分子信号传递是分子信号传递.
背景情况:
- 天生的免疫力是植物和动物对病原体的第一个防御.
- 微生物相关的分子模式 (MAMPs) 触发了保存的信号通路,包括MAPK级联.
- (Ca2+) 是植物防御的关键媒介,但其在早期MAMP反应中的感知和信号仍然不清楚.
研究的目的:
- 为了识别参与植物先天免疫信号传递的Ca2+传感器蛋白质.
- 阐明CDPKs在MAMP触发的转录重编程中的作用.
- 了解CDPKs,MAPK级联和早期防御基因激活之间的相互作用.
主要方法:
- 功能性基因组查以确定关键基因.
- 全基因组基因表达概况 (转录组分析).
- 产生和分析多个cpk突变植物 (双倍,三倍,四倍).
主要成果:
- 四个依赖的蛋白激酶 (CDPK) 被确定为关键的Ca2+传感器蛋白质,用于植物先天免疫中的转录重编程.
- CDPK和MAPK级联不同调节MAMP介导的程序,影响防御,代谢物,细胞壁修饰和氧化还原信号.
- 突变分析显示,CDPKs对于氧化突发,早期基因激活 (例如,由flg22) 和病原体防御至关重要,高阶突变的严重性增加.
结论:
- CDPK 作为各种 MAMP 触发的信号的关键融合点.
- 这项研究强调了Ca2+信号在植物中的复杂作用,揭示了特定CDPKs在启动MAMP信号通路方面的重要积极功能.
- CDPKs是植物先天免疫的重要积极调节者,与之前描述的负面调节者 (如calmodulin) 不同.
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