在Ustilaginoidea virens中对曼诺西尔转移酶相关基因的功能分析
Shilong Wang1, Yating Zhang1, Lili Qu2
1Department of Plant Pathology, College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China.
International journal of molecular sciences
|April 17, 2025
概括
米假污染病原体Ustilaginoidea virens使用ALG3效应蛋白N-糖化抑制米免疫力. 这种N-糖化对ALG3的稳定性和功能至关重要,使病原体能够逃避宿主防御.
科学领域:
- 植物病理学 植物病理学
- 分子菌学分子菌学
- 生物化学 生化学
背景情况:
- 由Ustilaginoidea virens引起的米虚假污垢对米生产和健康构成重大威胁.
- 病原性真菌分泌效应蛋白来抑制宿主免疫反应,通常涉及转化后的修改,如糖化.
- 病毒效应因子的翻译后调节,特别是N-糖化,仍然在很大程度上没有特征.
研究的目的:
- 研究N-糖化在U. virens效应蛋白ALG3.3的功能中的作用.
- 阐明ALG3对U. virens毒性和宿主免疫抑制有所贡献的机制.
主要方法:
- 基因删除突变结构 (ΔUvALG).
- 分析二次感染的叶生长和毒性.
- 测量宿主细胞中反应性氧物种的产生.
- 评估ALG3蛋白稳定性和胆结合活性.
- 在N-糖化位的位点定向突变发生.
主要成果:
- 删除ΔUvALG显著降低了U. virens的毒性,并阻止了二次感染的菌体生长.
- ΔUvALG突变诱导宿主细胞增加反应性物种的产生,表明无法抑制免疫力.
- ALG3 隔离着基寡糖,防止它们被大米识别,并抑制免疫激活.
- ALG3具有三个重要的N-糖化位点;同时进行Alg介导的N-糖化对于蛋白质稳定性和基结合活性至关重要.
结论:
- 甲基介导的ALG3的N-糖化对其稳定性和抑制大米先天免疫力的效应作用至关重要.
- 这种N-糖基化机制使U.病毒能够逃避宿主防御并建立感染.
- 准ALG3 N-糖化可能是开发抗病米品种的潜在策略.
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