菌体通过银河胺氧化酶操纵植物的天生的免疫力
Lydia R J Welsh1, Anna O Avrova1, Katrin Besser2
1Cell and Molecular Sciences, James Hutton Institute, Invergowrie, Dundee, UK.
Nature communications
|October 20, 2025
概括
植物虫感染者柏柏林桥梁类似酶的蛋白质 (BBEs) 修改植物细胞壁以逃避检测. 这项研究揭示了BBE对于病原体入侵至关重要,提供了新的作物保护策略.
科学领域:
- 植物病理学 植物病理学
- 分子微生物学分子微生物学
- 生物化学 生物化学
背景情况:
- 植物病原体 (Phytophthora infestans) 是一个重要的作物病原体,也是植物病原体相互作用的模型生物.
- 柏柏林桥酶样蛋白 (BBEs) 是各种生物体中发现的酶,但它们在虫病原性中的作用以前是未知的.
研究的目的:
- 为了功能性地描述P. infestans的BBE,并阐明它们在植物感染过程中的作用.
- 为了研究BBEs在植物细胞壁组件上的酶活性.
- 确定BBE在宿主殖民期间的本地化和重要性.
主要方法:
- 基因表达分析以确定感染期间的BBE上调.
- 酶性测试以评估由分泌的BBE氧化点滴素碎片的氧化.
- 光显微镜可视化植物中的BBE定位.
- 基因沉默用于评估BBE对感染进展的影响.
主要成果:
- 在P. infestans感染的早期,编码BBE的基因被上调.
- 分泌的BBE特别氧化较长的pectin片段,阻碍植物检测和反应性氧物种 (ROS) 信号传递.
- 主要的P. infestans BBE在感染期间定位在生殖管尖端和haustoria.
- 沉默BBE编码基因显著降低了病原体感染水平.
结论:
- 在P. infestans中,BBE是关键的病原性因素,促进宿主透和殖民.
- 由BBEs对pectin的酶性修饰代表了逃避病原体的新机制.
- 准BBE为开发作物保护和加强粮食安全的新战略提供了有希望的途径.
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