玉米Gα基因COMPACT PLANT2在CLAVATA信号中起作用,以控制芽系统的大小
Peter Bommert1, Byoung Il Je, Alexander Goldshmidt
1Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA.
Nature
|September 13, 2013
概括
玉米紧型植物2 (CT2) 蛋白质作为G-α子单元,从CLAVATA受体传递干细胞信号. 这一发现揭示了G蛋白信号在植物发育中的新角色,并挑战了传统的G蛋白结合受体 (GPCR) 结构.
科学领域:
- 植物生物学 植物生物学
- 分子遗传学 分子遗传学
- 细胞信号传递 细胞信号传递
背景情况:
- 芽生长调节依赖于美里系统,由CLAVATA (CLV) 途径和WUSCHEL基因反循环维持.
- 细胞信号传递涉及CLAVATA3 (CLV3) 受体通过CLV1和CLV2等富含白的重复受体 (LRR) 的感知.
- 下游信号传递机制,特别是对于缺乏内在信号域的LRR受体样蛋白,仍然不太了解.
研究的目的:
- 为了研究植物中CLAVATA LRR受体的下游信号组件.
- 为了确定玉米COMPACT PLANT2 (CT2) 基因在干细胞调节中的功能.
- 阐明异构三基G蛋白在植物发育和受体-连接体相互作用中的作用.
主要方法:
- 对玉米ct2突变的遗传分析和与Arabidopsis thaliana clavata突变的比较.
- 生物化学测试以确定CT2的蛋白质性质和功能.
- 功能性测试以评估CT2/Gα在从CLAVATA受体传输信号中的作用.
主要成果:
- 玉米紧型植物2 (CT2) 编码了一个异构三聚体GTP结合蛋白的α子单元 (Gα).
- 玉米ct2突变体表现出与Arabidopsis clavata突变体相似的表型,表明它们的作用是保留的.
- CT2/Gα被证明可以从CLAVATA LRR受体传递干细胞限制信号.
- 有证据表明,单通的跨膜受体在植物中作为G蛋白合受体 (GPCR) 起作用.
结论:
- 玉米CT2 / Gα在传输干细胞限制性信号方面发挥着至关重要的作用,在植物中建立了Gα信号传输的新功能.
- 这些发现挑战了既定的教条,即GPCRs仅是七通的跨膜 (7TM) 蛋白质,建议单通受体作为植物中的功能GPCR.
- 这项研究为了解植物发育和G蛋白介导的信号通路开辟了新的途径.
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