对于诱导性病原体防御所需的Arabidopsis中的一种新型蓝色代谢物
Jakub Rajniak1, Brenden Barco2, Nicole K Clay2
1Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.
Nature
|September 10, 2015
概括
研究人员在Arabidopsis thaliana中发现了一种新的植物防御途径,揭示了4-基-3-碳酸 (4-OH-ICN) 的生物合成. 这一发现揭示了有助于植物健康和对病原体免疫力的新分子.
科学领域:
- 植物生物化学
- 分子生物学
- 植物天生的免疫力
背景情况:
- 阿拉比多普西斯塔利亚的数千个基因缺乏已知的功能,这表明未被发现的分子对植物健康至关重要.
- 病原体诱导的P450细胞染色体是未表征的基因的关键组,在植物防御中具有潜在的作用.
研究的目的:
- 为了确定新型阿拉比多代谢物4-基-3-碳烯 (4-OH-ICN) 的完整生物合成途径.
- 阐明 CYP82C2 基因和相关酶在植物防御中的作用.
主要方法:
- 使用非向代谢学和同表达分析来识别4-OH-ICN通路.
- 在Saccharomyces cerevisiae和Nicotiana benthamiana中重建该途径以验证酶功能.
- 在4-OH-ICN途径中生成的Arabidopsis突变,用于功能分析.
主要成果:
- 发现了4-OH-ICN的完整生物合成途径, 这是一种具有前所未有的蓝色功能的新植物代谢物.
- 鉴定了一种亚利水素中间体,揭示了Arabidopsis中潜伏的基糖化物生物合成能力.
- 证明4-OH-ICN通路突变对Pseudomonas注射器的敏感性增加.
结论:
- 这项研究揭示了Arabidopsis中的一种新型的代谢分支,与素途径不同.
- 已识别的途径在诱导植物对细菌病原体的防御反应中起作用.
- 建立了一个更完整的框架来理解Arabidopsis中小分子介导的植物病原体防御.
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