Heterologous biosynthesis of betanin triggers metabolic reprogramming in tobacco

文献类型： 外文期刊

第一作者： Jiang, Xun

作者： Jiang, Xun;Zhang, Zhuoxiang;Wu, Xiuming;Li, Changmei;Sun, Xuan;Wu, Fengyan;Yang, Aiguo;Yang, Changqing

作者机构：

关键词： Synthetic biology; Betanin; Tobacco; Metabolic engineering; Transcriptome; Metabolome; Metagenome

期刊名称：METABOLIC ENGINEERING （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 1096-7176

年卷期： 2024 年 86 卷

页码：

收录情况： SCI

摘要： Engineering of a specialized metabolic pathway in plants is a promising approach to produce high-value bioactive compounds to address the challenges of climate change and population growth. Understanding the interaction between the heterologous pathway and the native metabolic network of the host plant is crucial for optimizing the engineered system and maximizing the yield of the target compound. In this study, we performed transcriptomic, metabolomic and metagenomic analysis of tobacco (Nicotiana tabacum) plants engineered to produce betanin, an alkaloid pigment that is found in Caryophyllaceae plants. Our data reveals that, in a dosedependent manor, the biosynthesis of betanin promotes carbohydrate metabolism and represses nitrogen metabolism in the leaf, but enhances nitrogen assimilation and metabolism in the root. By supplying nitrate or ammonium, the accumulation of betanin increased by 1.5-3.8-fold in leaves and roots of the transgenic plants, confirming the pivotal role of nitrogen in betanin production. In addition, the rhizosphere microbial community is reshaped to reduce denitrification and increase respiration and oxidation, assistant to suppress nitrogen loss. Our analysis not only provides a framework for evaluating the pleiotropic effects of an engineered metabolic pathway on the host plant, but also facilitates the development of novel strategies to balance the heterologous process and the native metabolic network for the high-yield and nutrient-efficient production of bioactive compounds in plants.

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