一种植物病原菌效应蛋白的激活,由一个真核细胞环素激活
Gitta Coaker1, Arnold Falick, Brian Staskawicz
1Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.
概括
植物免疫受体RPS2使用一种细菌效应蛋白,AvrRpt2,来触发防御. 由环菲林激活的AvrRpt2会切割RIN4,从而启动植物对Pseudomonas syringae的抗药性.
科学领域:
- 植物免疫力 植物免疫力
- 分子植物微生物相互作用.
- 细菌病原体的发生.
背景情况:
- 高级植物具有天生的免疫力来检测细菌效应蛋白.
- 阿拉比多普西斯对Pseudomonas syringae的耐药性依赖于RPS2蛋白质,当像AvrRpt2这样的效应物存在时.
研究的目的:
- 阐明 AvrRpt2 激活 RPS2 中介植物免疫的机制.
- 为了确定负责AvRpt2激活的宿主因子.
主要方法:
- 研究了AvrRpt2在工厂防御信号中的作用.
- 确定了激活AvrRpt2蛋白酶活性的宿主因子.
- 确定了植物细胞内AvrRpt2的点.
主要成果:
- AvrRpt2是一种囊蛋白酶,可以切割阿拉比多的蛋白质RIN4.
- 通过 AvrRpt2 的 RIN4 裂变作为 RPS2 中介电阻的信号.
- 一种被识别为环素的真核细胞因子是AvrRpt2激活和随后的RIN4裂变所必需的.
结论:
- 循环林介导的AvrRpt2的激活对其蛋白酶活性至关重要.
- 活跃的AvrRpt2直接分裂RIN4,触发植物防御反应.
- 这条路径突出了对细菌病原体的复杂植物监控机制.
相关概念视频
Transgenic Plants
Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
Transformation
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
Microbe-Plant Interactions
Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
Bacterial Toxins
Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...


