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波拉指导信号复合组合和定位驱动不对称的细胞分裂
Anaxi Houbaert1,2, Cheng Zhang1,2, Manish Tiwari1,2
1Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.
Nature
|November 16, 2018
概括
在植物口腔发育过程中,POLAR蛋白作为支架来调节不对称的细胞分裂. 这种机制通过控制酶活动和局部化来确保细胞的适当命运.
科学领域:
- 植物细胞生物学
- 分子植物科学
- 发育生物学
背景情况:
- 不对称的细胞分裂 (ACD) 对于植物的生存和发育至关重要,以口腔细胞系为例.
- 糖原合成酶KINASE3 (GSK3) / SHAGGY类激酶BRASSINOSTEROID INSENSITIVE 2 (BIN2) 在调节口腔ACD方面具有双重作用.
- 无法平衡BIN2对基激活蛋白激酶 (MAPK) 信号和SPEECHLESS (SPCH) 活性的影响.
研究的目的:
- 阐明控制植物口腔系中不对称细胞分裂的调节机制.
- 确定参与平衡GSK3类激酶在口腔发育中的双重作用的因素.
- 了解GSK3在植物细胞中如何实现基质特异性.
主要方法:
- 确定植物特异性蛋白质POLAR作为口腔系中的关键调节剂.
- 研究POLAR作为GSK3类激酶的支架的作用.
- 分析POLAR和突破胃系不对称性 (BASL) 对激酶局部化和活性的影响.
主要成果:
- 在ACD之前,POLAR将GSK3类激酶限制在细胞质中,并暂时将其与BASL两极化.
- 这种局部化减弱了MAPK信号,使SPCH能够在核中促进ACD.
- 波拉的循环由GSK3介导的酸化调节,这表明有反机制.
结论:
- 支架蛋白POLAR确保了GSK3基质的特异性,提供了调节ACD的新机制.
- 控制酶活动和局部化的POLAR功能为了解植物中的GSK3调节提供了一个范例.
- 这项研究揭示了植物发育过程中细胞命运决定的分子控制.
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