工程基质杂性和基素类化合物的催化效率N-甲基转移酶
Yuyang Zhang1, Pan Yang1, Zhenshan Chen1
1State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China.
Journal of agricultural and food chemistry
|March 5, 2026
概括
研究人员从Stephania yunnanensis中设计了新型的基素类化合物N-甲基转移酶 (NMTs). 这项工作使N-甲基化转化为O-甲基化,扩大了生产有价值的植物衍生物化合物的酶工具包.
科学领域:
- 生物化学 生化学
- 酶学 是一种酶学.
- 代谢工程是代谢工程.
背景情况:
- 化素化物 (BIA) 是具有重要的药用和农业应用的植物代谢物.
- N-甲基化是影响BIA生物活性和生物可用性的关键修饰.
研究的目的:
- 来自Stephania yunnanensis的新型BIA N-甲基转移酶 (NMTs) 的特征.
- 为改变基质特异性和提高催化效率设计NMT.
- 为了证明N-甲基化转化为O-甲基化的功能转化.
主要方法:
- 从S. yunnanensis中分离和描述SyNMT1和SyNMT2的特征.
- 位点定向突变发生,以确定影响酶活性的关键残留物.
- 酶动力学测试以确定催化效率和基质特异性.
- 来自Papaver somniferum的PsCNMT的工程.
主要成果:
- 确定了关键的残留物 (SynMT1中的A216/F217;SynMT2中的E218/L219/L223),这些残留物控制了基质的杂乱性和效率.
- 针对特定的BIA6-O-甲基转移酶活性进行工程化SyNMT2-L219F变体,实现N-到O-甲基化转化.
- 突变的PsCNMT (E197A/L198F) 提高了催化效率 (Kcat和Kcat/Km分别是1.22倍和1.07倍).
结论:
- 提供了工程BIA NMT的基板杂交性和催化效率的蓝图.
- 证明了N-甲基化转化为O-甲基化的酶性转化潜力.
- 丰富了生产医学和农业重要BIAs的酶工具箱.
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