QUIRKY通过精确降解ABI5来控制种子发芽
Yupeng Jiang1, Yunke Zhu1, Meiqi Shi1
1Shanghai Collaborative Innovation Center of Agri-Seeds/Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
Science advances
|December 3, 2025
概括
调节酸 (ABA) 信号的蛋白质QUIRKY (QKY) 通过准ABI5进行降解来控制种子发芽. 失去QKY功能会增加ABA敏感性,阻碍发芽和苗木的建立.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- 酸 (ABA) 对于调节种子休眠和发芽至关重要.
- 亚巴不敏感5 (ABI5) 是一个关键的转录因子,抑制发芽,特别是在压力条件下.
研究的目的:
- 确定涉及种子发芽的ABA信号传递的新型调节者.
- 阐明 QUIRKY (QKY) 在 ABI5.5 的翻译后调节中的作用.
主要方法:
- 酵母两混合测试检测蛋白质与蛋白质相互作用.
- 同免疫沉以确认QKY-ABI5相互作用.
- 降解测试用于评估ABI5的稳定性.
- 在阿拉比多普西斯突变物中分析种子发芽和幼苗的建立.
主要成果:
- 基 (QKY) 是一种多个C2域和跨膜区域蛋白 (MCTP),与ABI5.5相互作用.
- QKY促进了ABI5的细胞质降解,通过E3泛基因酶KEEP ON GOING (KEG).
- 失去QKY功能会导致ABA过敏,减少种子发芽,并损害苗木的建立.
结论:
- QKY充当了支架蛋白,集成相位分离和无处不在,以调节ABA信号.
- QKY微调ABA反应,平衡种子休眠和发芽.
- 这项研究揭示了MCTPs在植物早期发育过程中的生长压力权衡中的关键作用.
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