植物免疫受体Sr50的复活,以克服病原体的免疫逃避
Kyungyong Seong1, Wei Wei1, Sophie C Sent2
1Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.
bioRxiv : the preprint server for biology
|August 16, 2024
概括
科学家们对小麦进行了改造.
科学领域:
- 植物病理学 植物病理学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 植物疾病在全球范围内造成重大作物损失.
- 病原体进化经常克服植物耐药性基因,比如小麦Sr50基因对抗茎生.
- 有效的疾病控制需要克服病原体逃避植物免疫力的策略.
研究的目的:
- 为了设计小麦Sr50蛋白来识别进化的病原体效应因子.
- 恢复植物对已经绕过现有抵抗机制的病原体的免疫力.
- 开发一个框架来设计核酸结合的氨酸丰富的重复受体 (NLR) 蛋白.
主要方法:
- 利用计算结构分析和位点定向突变发生法来修改Sr50蛋白.
- 采用分子对接和蛋白质结构建模来引导突变.
- 在 *Nicotiana benthamiana* 和小麦原塑中测试了工程 Sr50 变体.
主要成果:
- 在Sr50中单次K711D替代部分恢复了AvrSr50QCMJC效应者的识别.
- 增强Sr50K711D的表达恢复了强大的免疫反应.
- 工程 Sr50 变种表现出对原始和进化的效应器的双重识别,展示了协同效应的表现.
结论:
- 通过NLR蛋白质工程,可以抵消病原体的适应,并恢复植物对疾病的抵抗力.
- 创建了新的Sr50变种,这些变种有可能在小麦中产生持久的茎抗性.
- 这项研究提供了一个针对不断演变的病原体的NLR工程模型.
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