防御性葡萄酸盐的出口是它们在种子中积累的关键
Deyang Xu1, Niels Christian Holm Sanden2, Line Lykke Hansen2
1DynaMo Center, Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg, Denmark. dyxu@plen.ku.dk.
Nature
|April 19, 2023
概括
研究人员确定UMAMIT运输商是植物种子中葡萄糖酸盐的主要出口商. 这些通常多种氨基酸的输送蛋白可以减少作物中的反营养化合物.
科学领域:
- 植物分子生物学和作物科学.
- 膜运输和代谢物贩运.
背景情况:
- 植物代谢物分布对于农学特征至关重要.
- 阻断进口者可以减少反营养因素,但改变整个工厂的分布.
- 工程出口商提供了针对性代谢物控制的替代策略.
研究的目的:
- 确定铜油作物的工程葡萄酸盐出口的分子标.
- 描述UMAMIT家族成员在葡萄糖酸盐转移到种子中的作用.
主要方法:
- 在Arabidopsis thaliana中对UMAMIT家族的载体进行鉴定和描述.
- 对种子葡萄糖酸盐水平的功能丧失三重突变 (umamit29 umamit30 umamit31) 的分析.
- 模拟涉及UMAMIT出口商和GTR进口商的葡萄糖酸盐运输途径.
主要成果:
- 确定UMAMIT29,UMAMIT30和UMAMIT31是使用单一出口机制的葡萄糖酸盐出口商.
- 缺乏这些UMAMIT载体的三重突变体显著降低了种子的葡萄糖酸盐水平.
- 提出了一个模型,其中UMAMITs促进了流入apoplast以供GTRs随后吸收到floem中.
结论:
- 在种子特异性葡萄糖酸盐的积累中,UMAMIT输送体起着至关重要的作用.
- UMAMIT的出口商是提高油作物的营养价值的潜在目标.
- 这种策略避免了整个工厂的防御化合物的分布.
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