来自Chenopodium quinoa的两个甘-3-酸盐酸转移酶5同类体的功能鉴定
Zhen Wang1, Yuxin Liu1, Haodong Huang2
1College of Life Sciences, Shandong Normal University, Jinan 250014, China.
概括
昆中的甘-3-酸盐转化酶5 (GPAT5) 是由盐应激诱导的. 一种特定的蛋白质变异 (S251L) 影响GPAT5的活性和丰度,这表明状细胞的功能保存.
科学领域:
- 植物生物化学 植物生物化学
- 分子生物学分子生物学
- 哈洛菲特研究研究
背景情况:
- 甘-3-酸盐转化酶5 (GPAT5) 对于模型植物中的苏贝林生物合成至关重要.
- 在半体中,特别是盐水条件下,GPAT5的功能性保存仍然在很大程度上未被探索.
研究的目的:
- 为了识别和特征GPAT5同类在植物Chenopodium quinoa.
- 研究CqGPAT5a和CqGPAT5b的表达模式,定位和酶活性.
- 阐明特定氨基酸变异对CqGPAT5a活性和稳定性的功能影响.
主要方法:
- 鉴定和克隆CqGPAT5a和CqGPAT5b基因.
- 在盐应力下进行基因表达分析的RT-qPCR.
- 酵母补充测试以确定酶活性.
- 使用短暂表达的亚细胞局部化研究.
- 对CqGPAT5a变体的局部定向突变发生和功能分析.
主要成果:
- 在菜中发现了两种GPAT5同类物,CqGPAT5a和CqGPAT5b.
- 这两种基因都在根部高度表达,并由高盐应激引起.
- CqGPAT5a和CqGPAT5b表现出甘-3-酸盐乙烯转移酶活性,并局部化到内 плазма网膜.
- 与CqGPAT5b相比,CqGPAT5a中的血清对白蛋白变异 (S251L) 显著影响了其活性和蛋白质丰度.
结论:
- 昆中的GPAT5同类体参与盐应激反应,并具有酶活性.
- 在CqGPAT5a中有一种特定的氨基酸变异影响其功能和稳定性.
- 这些发现表明,GPAT5功能可能在半体中保持,有助于应激适应.
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