双远端插入驱动皮马兰到米尔蒂拉迪因的重新排列,增强了酶活性
Jianing Liu1, Jian Wang1, Guanghong Cui1
1State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China.
Biodesign research
|December 19, 2025
概括
研究二烯生物合成中的酶突变表明,修改一个灵活的区域可以增强密尔蒂拉迪因的产生. 这一发现有助于设计出更好的酶来生产有价值的天然产品.
科学领域:
- 生物化学 生物化学
- 自然产品 化学 化学
- 酶工程是什么? 酶工程是什么?
背景情况:
- 阿比坦二烯酸是具有显著药理潜力的有价值的天然产品.
- 阿比骨的生物合成涉及复杂的酶重组,关键机制尚不清楚.
- 之前的研究表明,修改Isodon rubescens KSL3a中的特定氨基酸将其产物从pimarane改变为abietane diterpenes.
研究的目的:
- 为了研究远端柔性区域在阿比二烯合成中的作用.
- 为了确定这个区域的突变是否会影响酶功能,溶解性和基质亲和力.
- 为增强代谢物生产设计改进的二二烯合成酶.
主要方法:
- 对位点导向的突变发生在异二二烯合成酶 (IrKSL6) 和多二二合成酶 (SmKSL1) 上进行.
- 突变引入了两个特定的氨基酸位点在活跃中心远端的柔性区域.
- 研究人员对表达突变SmKSL1的工程细菌进行了分析,以测量其密尔蒂拉迪因生产,蛋白质溶解度和催化效率.
主要成果:
- 发现远端柔性区域的突变在改变酶功能的过程中是保守的.
- 这些突变显著影响了SmKSL1.1的可溶性和基质亲和力.
- 工程SmKSL1 (E550+KR) 显示,米尔蒂拉迪因标位增加了44%,蛋白质溶解度增加了24%,催化效率 (Kcat/Km) 增加了26%.
结论:
- 迪特尔合成酶的远端柔性区域在它们的物理化学性质中起着至关重要的作用.
- 针对该地区提供了一个战略,用于合理设计和工程的阿比二烯合成.
- 高性能突变物为药理相关代谢物的生物合成平台提供了改进的酶工具.
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