脱氧基氨酸5-酸盐合成酶在调节中甲基利4-酸盐路径方面没有起到主要作用
Diego González-Cabanelas1, Erica Perreca1, Johann M Rohwer2
1Department of Biochemistry, Max Plank Institute for Chemical Ecology, Hans-Knöll-Straße 8, 07745 Jena, Germany.
International journal of molecular sciences
|April 27, 2024
概括
1 - 脱氧基酸合成酶 (DXS) 酶在调节树中的2 - C - 甲基四酸 (MEP) 途径方面起到较小的作用. 操纵DXS活动并没有显著改变异烯排放,但影响了叶绿素和胡卜素水平.
科学领域:
- 植物生物化学 植物生物化学
- 代谢途径调节的调节
- 异类生物合成异类生物合成
背景情况:
- 塑性2C-甲基利4-酸盐 (MEP) 途径对于生产必需的植物异oprenoids至关重要.
- 了解MEP通路的调节,特别是其初始酶,对于植物科学至关重要.
研究的目的:
- 调查1 - 脱氧基酸合成酶 (DXS) 在灰 (Populus × canescens) 的MEP通路中的调节作用.
- 量化改变DXS活动对碳流量和异oprenoid最终产品水平的影响.
主要方法:
- 代谢控制分析 (MCA) 用于研究转基因树系中的DXS活性.
- 动态13CO2标记和质子转移反应质谱学 (PTR-MS) 用于测量通过MEP通路的碳流量.
- 气体交换测量是在受控的光和温度条件下进行的.
主要成果:
- 过度表达DXS使MEP通路的流量增加了25-35%,而RNA干扰使DXS活动减少了50%,而不会改变流量.
- 在所有经过测试的DXS修改线路中,异烯排放量保持不变.
- 与过度表达线相比,在RNA干扰线中,叶绿素和胡卜素水平显著降低.
结论:
- DXS在控制异二烯排放灰中通过MEP路径的整体碳流中起到较小的作用.
- 虽然DXS不调节异二烯排放,但它会影响其他必需的异二烯末端产品的水平,如叶绿素和胡卜素.
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