从载体传播的细菌植物病原体的鞭毛蛋白,冷冲击蛋白和延长因子Tu的感知和演变
Jessica Trinh1, Megann Tran1, Gitta Coaker1
1Department of Plant Pathology, University of California, Davis, Davis, California, USA.
Molecular plant pathology
|October 26, 2024
概括
载体传播的细菌植物病原体已经进化到逃避植物免疫检测. 它们的蛋白质特征较少具有免疫性,这表明一种策略可以避免被宿主模式识别受体识别.
科学领域:
- 植物病理学 植物病理学
- 细菌遗传学 细菌遗传学
- 植物与微生物的相互作用
背景情况:
- 载体传播的细菌病原体导致全球农作物的重大损失.
- 这些病原体由于宿主/载体依赖性而具有减少的基因组.
- 植物免疫系统通过模式识别受体检测到保存的病原体特征.
研究的目的:
- 研究植物对载体病原体及其自由生活的亲属蛋白质特征的免疫识别.
- 为了比较冷冲击蛋白 (csp22),鞭毛蛋白 (flg22) 和延长因子Tu (elf18) 的表位的免疫性.
主要方法:
- 在载体传播的病原体与自由生活的亲属中对csp22,flg22和elf18的基因拷贝数进行比较分析.
- 在植物免疫反应试验中,使用西红和阿拉比多普西斯模型来评估表位细胞免疫性.
- 检查特定的"Candidatus Liberibacter"csp22表位在阳和非阳植物中的表位.
主要成果:
- 与自由生活的亲属相比,载体传播的病原体通常具有较少的csp22和鞭毛素基因拷贝.
- 来自载体传播的病原体的皮层表现出较低的免疫原性,而不是来自自由生活的对应物.
- "Candidatus Liberibacter asiaticus"的csp22引发了植物免疫反应,与"Candidatus Liberibacter solanacearum"的csp22不同.
结论:
- 载体传播的细菌植物病原体已经进化了逃避宿主免疫识别的机制.
- 病原体衍生表位体的免疫性降低是免疫逃避的一个关键策略.
- 特定的表位变异会影响病原体触发植物免疫的能力.
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