与BZR1相互作用的WD重复蛋白参与番茄的布拉西诺固醇依赖的生长和应激反应
Yue Liu1, Xiaole Meng2, Chuyong Chen2
1Department of Horticulture, Zijingang Campus, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P.R. China; Hainan Institute, Zhejiang University, Sanya 572025, P.R. China.
Cell reports
|January 22, 2026
概括
研究人员发现了一种新的蛋白质BIW,它有助于降解BZR1,这是巴西诺体 (BR) 信号传递的关键因素. 这一发现提供了关于植物生长和冷却耐受性的见解,有可能改善作物弹性.
科学领域:
- 植物生物学 植物生物学
- 分子植物科学 分子植物科学
- 激素信号传递 激素信号传递
背景情况:
- 铜类固醇 (BRs) 是重要的类固醇激素,调节植物生长和应激反应.
- 布拉西纳抗性1 (BZR1) 是BR信号传输中的中心转录因子,其稳定性由BIN2激酶酸化控制.
- 控制BZR1降解的机制在很大程度上是未知的.
研究的目的:
- 为了确定涉及BZR1降解的新型调节者,在布拉辛固醇信号通路内.
- 为了阐明番茄 (Solanum lycopersicum) 中新发现的BZR1相互作用蛋白的功能.
- 研究这种蛋白质在植物生长中的作用,耐压力及其由BIN2.2调节的作用.
主要方法:
- 酵母二杂交查以确定BZR1相互作用蛋白.
- 对已识别的蛋白质 (BIW) 的番茄突变和过度表达线的遗传分析.
- 生物化学分析以确认无处不在,降解和酸化事件.
主要成果:
- 一种与BZR1相互作用的WD40重复蛋白,名为BIW,被确定为BZR1无处不在和降解的促进者.
- BIW突变导致表型模仿升高的BR信号和增强的冷却耐受性.
- 过度表达BIW导致相反的表型,包括降低冷却耐受性,BIW在Ser144的BIN2介导酸化对其活性至关重要.
结论:
- BIW是布拉西诺固醇信号通路的关键组成部分,调解BZR1降解.
- 这些发现揭示了控制BZR1稳定性和工厂应激弹性的一种新型监管机制.
- BIW代表了基因工程的潜在目标,以提高植物的生产力和环境适应能力.
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