芳酸脱水酶异型在Akebia trifoliata中战略性地去调节 fenylalanine 生合成
1Key Laboratory of Plant Genetics and Breeding at Sichuan Agricultural University of Sichuan Province, Chengdu 611130, Sichuan, China; Cuisine Science Key Laboratory of Sichuan Province, Sichuan Tourism University, Chengdu 611130, China.
International journal of biological macromolecules
|May 24, 2024
概括
研究人员在Akebia trifoliata中鉴定了八个arogenate dehydratase (ADT) 基因,揭示了各种功能和组织特异性的表达模式,这些基因对于氨酸生物合成调节至关重要.
科学领域:
- 植物生物化学和分子生物学
- 代谢途径工程是指代谢途径的工程.
背景情况:
- 氨基酸脱水酶 (ADT) 是氨酸 (Phe) 的生物合成中的关键酶,氨酸是植物中必需的氨基酸.
- 了解ADT的功能对于优化氨基酸含量至关重要,特别是在农业重要物种,如Akebia trifoliata.
研究的目的:
- 为了识别和描述酸脱水酶 (ADT) 成分及其在Akebia trifoliata中的功能.
- 在AktADTs中调查月光前酸脱水酶 (PDT) 活性的结构和功能基础.
- 阐明A. trifoliata中氨生物合成的调节机制,以实现潜在的遗传改进.
主要方法:
- 在A. trifoliata基因组中的八个ADT基因 (AktADT1-8) 的生物信息识别.
- 生物化学试验以确定AktADT蛋白质的前酸脱水酶 (PDT) 活性和动力参数 (Km).
- 使用Saccharomyces cerevisiae pha2淘汰突变的功能补充测定.
- 对AktADT表达模式,Phe抑制 (IC50) 和亚细胞局部化的分析.
主要成果:
- 确定了8个AktADT基因,其中5种蛋白质表现出月光PDT活性.
- 在PAC领域的特定残留物组合对于PDT活动至关重要.
- AktADT4和AktADT8在功能上补充了酵母法2突变.
- AktADTs表现出无处不在但组织特定的表达,对Phe抑制的敏感性各不相同.
- 亚细胞局部化各异,蛋白质存在于叶绿体流体,细胞质和叶绿体流体中.
结论:
- 多种策略调节Akebia trifoliata中的氨酸生物合成,导致其高Phe含量.
- 某些AktADT的月光PDT活性在Phe代谢中起着重要作用.
- 这些发现为A. trifoliata可食用水果的遗传改进提供了洞察力.
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