一个细菌效应器劫持了NBR1以调节自和泛介导降解,促进细菌感染
Yaqian Shi1,2, Fang Fang1,2, Xuejin Cui1
1National Citrus Engineering Research Center, Citrus Research Institute, Southwest University, Chongqing, China.
Plant biotechnology journal
|December 17, 2025
概括
类病原体使用效应蛋白来逃避宿主防御. 这项研究揭示了细菌效应蛋白SDE4405如何操纵全方位/26S蛋白酶体系统 (UPS) 和自,促进感染和疾病.
科学领域:
- 植物病原体相互作用
- 分子植物病理学 分子植物病理学
- 细胞免疫力 细胞免疫力
背景情况:
- 自和无处不在/26S蛋白酶体系统 (UPS) 是对病原体的关键宿主免疫机制.
- 病原体经常部署效应蛋白来破坏这些细胞防御系统.
- 一个单一的病原体效应器对自和UPS的协调调节仍然不太了解.
研究的目的:
- 为了研究Citrus sinensis RING finger E3结合酶 (CsRHY1A) 和Candidatus Liberibacter asiaticus (CLas) 效应蛋白SDE4405.5之间的相互作用.
- 阐明SDE4405颠覆宿主自和UPS通路的机制.
- 了解SDE4405中特定氨酸残留物对其相互作用和功能的作用.
主要方法:
- 同免疫沉以确认蛋白质相互作用.
- 乌比基化试验检测蛋白质的修饰.
- 降解测试用于评估蛋白质的稳定性.
- 酵母二杂交和双分子光补充 (BiFC) 来研究蛋白质-蛋白质相互作用.
- 位点定向突变发生,以确定关键的功能残留物.
主要成果:
- CsRHY1A与CLas效应体SDE4405直接相互作用,并通过在Lys87和Lys92.2的无化对其进行蛋白质体降解.
- SDE4405通过破坏无化来竞争性抑制CsRHY1A介导的降解,并准自受体CsNBR1.
- SDE4405干扰了CsNBR1-CsATG8s的结合,抑制了另一种CLas效应物的选择性自,即SDE1.1.
- SDE4405的Lys87和Lys92对于与CsRHY1A和CsNBR1的相互作用以及对CsNBR1依赖的稳定至关重要.
结论:
- CLas效应器SDE4405采用了一种复杂的策略,以抵消类植物中蛋白质酶和自取决于自的降解途径.
- SDE4405操纵宿主泛素联酶CsRHY1A和自受体CsNBR1,以促进其自身的稳定性和细菌毒性.
- 了解这些病原体逃避机制为开发抗黄龙 (HLB) 的类品种提供了潜在的目标.
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