在非血管性陆地植物中通过伊诺西酸盐进行GA独立的DELLA调节
Priyanshi Rana1, Anjana Edathil Kadangodan1, Paulami Koley1
1Department of Biochemistry, Indian Institute of Science (IISc), Bengaluru, India.
Nature chemical biology
|August 1, 2025
概括
在肝中,伊诺西酸 (InsP8) 降解了DELLA蛋白,促进了植物的发育. 这种非正规的DELLA规则保留在开花植物中,揭示了植物信号的新见解.
科学领域:
- 植物生物学 植物生物学
- 分子信号传输的方法
- 生物化学 生物化学
背景情况:
- 德拉蛋白质是植物生长的关键调节者,可以整合环境信号.
- 吉伯雷林 (GAs) 通常通过GID1受体在开花植物中触发DELLA降解.
- 植物,包括肝,拥有DELLA基因,但缺乏正规的GA受体,使其DELLA调节机制不清楚.
研究的目的:
- 为了研究控制DELLA蛋白调节的分子机制,在 bryophyte Marchantia polymorpha.
- 在非开花的陆地植物中确定调节DELLA抑制剂的新信号通路.
- 探索DELLA调节机制的进化保护.
主要方法:
- 对Marchantia polymorpha突变物进行遗传分析.
- 生物化学试验研究蛋白质 - 伊诺西托尔 - 酸盐相互作用.
- 乌比基化和蛋白质体降解试验.
- 与血管精子DELLA调节的比较分析.
主要成果:
- 在Marchantia polymorpha中,因诺酸盐信使InsP8对MpDELLA进行负面调节.
- InsP8直接与MpDELLA结合,促进其多基化和蛋白质体降解.
- 这种由InsP8介导的DELLA降解促进了肝的细胞分裂和体发育.
- 有证据表明,InsP8控制的DELLA降解在血管精子中保持.
结论:
- 伊诺西铁酸盐是陆地植物DELLA调节的非正规途径.
- 这条路由由植物保存到芽植物,突出显示了它在植物发育中的基本作用.
- 这项研究揭示了一种独立于正规GA受体的新信号机制,用于控制植物生长.
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