这是由 chalcone 异构酶类蛋白质调节 chalcone 合成酶的分子机制
Song Wang1,2, Li-Ying Ma1, Zhou-Geng Xu3
1Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Botanical Garden, Shanghai Chenshan Plant Science Research Center, CAS Center for Excellence in Molecular Plant Sciences (CEMPS), Chinese Academy of Sciences (CAS), Shanghai, China.
Nature communications
|March 15, 2026
概括
甲异构酶类蛋白 (CHIL) 通过关闭其活性部位来调节甲合成酶 (CHS),从而增强类蛋白的产生. 工程CHIL提高了CHS的效率,提供了作物改进策略.
科学领域:
- 生物化学 生物化学
- 植物生物学 植物生物学
- 结构生物学 结构生物学
背景情况:
- 黄酸是重要的植物化合物,酸盐合成酶 (CHS) 控制它们的生物合成.
- 由于CHS的催化性散乱,这可能会限制黄酸的生产效率.
- 石墨烯异构酶样蛋白 (CHIL) 与CHS相互作用,但其调节机制尚不清楚.
研究的目的:
- 阐明CHIL调节CHS活动的结构机制.
- 调查CHIL在控制对黄类药物代谢流量的作用.
- 探索增强植物中黄类生物合成的战略.
主要方法:
- 进行X射线晶体学以确定CHS-CHIL复合物的结构.
- 分子动力学模拟用于分析蛋白质-蛋白质相互作用和催化循环.
- 针对位点的突变发生和酶活性测试,以评估功能影响.
- 进化分析以追踪监管机制的保存.
主要成果:
- 通过其β-毛,CHIL通过物理关闭基质结合口袋入口来调节CHS.
- 通过促进COA释放和稳定关键残留物,CHIL增强了CHS活性和产品特异性.
- 在CHIL的β-hairpin中,一种特定的histidine残留物 (His36) 对于调节至关重要;它的突变提高了CHS的效率.
- 这种调节机制在各种植物谱系中得到保护.
结论:
- 一种保存的约束-符合性调节机制控制了CHS活性和黄类生物合成.
- 作为一个关键的调节器,优化代谢流向黄路径.
- 工程 CHIL 变种显示出增强作物中黄酸生产的潜力.
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