阿布西斯酸不敏感5的氧调节会影响Arabidopsis的种子发芽和幼苗发育
Inmaculada Sánchez-Vicente1, Fátima Pollo-Rodríguez1, Isabel Mateos1
1Dept. of Botany and Plant Physiology, Institute for Agribiotechnology Research (CIALE), Faculty of Biology, University of Salamanca. C/Río Duero 12, 37185 Salamanca, Spain.
Journal of experimental botany
|February 6, 2026
概括
翻译后的修改调节了种子的发芽. 氧化对ABI5 (一种关键的转录因子) 的修饰影响了苗木的建立,像氧化h5 (TRXh5) 这样的氧化还原素控制了这一过程的可逆性.
科学领域:
- 植物生物学 植物生物学
- 分子信号传递是分子信号传递.
- 转毒生物学 转毒生物学
背景情况:
- 翻译后修饰 (PTMs) 对于调节转录因子活性和细胞反应至关重要.
- 种子发芽和苗木建立是由PTMs控制的复杂过程,特别是涉及酸 (ABA) 信号通路和ABI5转录因子.
研究的目的:
- 为了研究氧化还原环境在调节ABI5复合体及其特定修饰位的作用,Cys153.3.
- 阐明ABI5.5的氧化介导S-化 (SNO) 的分子机制和可逆性.
- 探索氧化还原素对ABI5调节的影响及其对种子发芽和苗木建立的下游影响.
主要方法:
- 在不同氧化还原条件下分析ABI5复合物的形成.
- 对Cys153的局部定向突变发生和对ABI5亚细胞局部化酸化效应的评估.
- 使用 thioredoxin h5 (TRXh5) 建立一个用于 SNO 逆转性的酶系统.
- 在种子中过度表达ROXY10和ROXY21氧化还原素,以观察对发芽和ABI5积累的影响.
主要成果:
- 氧化还原环境显著影响ABI5复合体的形成,其中Cys153发挥着关键作用.
- 对Cys153的突变和酸化状态改变了ABI5的亚细胞局部.
- 一个涉及TRXh5的酶系统证明了ABI5 S-化过程的可逆性.
- 过度表达ROXY10和ROXY21导致种子发芽失调和改变ABI5蛋白水平.
结论:
- 氧化还原调节,特别是在Cys153中对ABI5的S-化,是控制种子发芽和苗木建立的关键机制.
- 由TRXh5介导的ABI5 SNO的可逆性突显了植物中氧化还原信号的动态性质.
- 这项研究确定了氧化还原控制和通过ABI5传递ABA信号之间的直接生理联系,这对植物发育至关重要.
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