对参与氨酸生物合成的弗拉依赖单氧化酶PhzO的研究
Yan-Fang Nie1, Sheng-Jie Yue1, Peng Huang1
1State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China.
Microbial biotechnology
|June 21, 2025
概括
工程flavin还原酶 (Fre) 提高了flavin依赖的单氧化酶PhzO的催化效率,从而提高了生物活性phenazine衍生物的产生. 这项研究确定了一种新型二基化氨酸,3,4-二基氨酸-1-碳酸酸 (3,4-OH-PCA),具有显著的抗癌特性.
科学领域:
- 生物化学和分子生物学
- 代谢工程是代谢工程.
- 自然产品化学 自然产品化学
背景情况:
- 氨酸是重要的二次代谢物,具有多种生物活性,包括抗真菌和抗癌性质.
- 氧化纳通常表现出增强的生物活性,但它们的产生受到酶效率的限制.
- 黄素依赖的单氧化酶PhzO将氨酸-1-碳酸 (PCA) 转化为2-氨酸氨酸 (2-OH-PHZ),具有较低的催化效率.
研究的目的:
- 提高PhzO的催化效率,以增加生物活性氨酸衍生物的生产.
- 通过酶工程生产的新型氧化酶化合物的特征.
- 探索PhzO作为一种无序生物催化剂的潜力,用于产生多样化的phenazine结构.
主要方法:
- 在Pseudomonas chlororaphis LX24AE中工程flavin减少酶 (Fre) 介导的FADH2再生以提高PhzO活性.
- 在P. putida KT2440.中,Fre-PhzO模块的异质共同表达.
- 使用UPLC-MS和NMR对新型衍生物的表征.
- 在体外和体内测试以评估酶活性,基质度影响和产品分布.
- 孤立化合物的细胞毒性对癌症细胞系的评估.
主要成果:
- 通过工程FADH2再生,从25%提高到40%的PhzO催化效率.
- 鉴定和描述了一种新型二基化衍生物,即3,4-二基氨酸-1-碳酸酸 (3,4-OH-PCA).
- 与单独的PhzO相比,Fre-PhzO模块的氧化效率提高了4.5倍.
- PhzO表现出FAD-依赖的催化混杂性,产生了2-OH-PCA和3,4-OH-PCA.
- 3,4-OH-PCA对食道癌细胞 (TE-1) 和宫癌细胞 (HeLa) 具有显著的细胞毒性 (IC50值分别为8.55微米和17.69微米).
结论:
- 工程FADH2再生是一种有效的策略,可以增强PhzO活性和phenazine衍生物的生产.
- PhzO是一种无序的生物催化剂,能够进行双化,使得新型生物活性化合物的合成成为可能,如3,4-OH-PCA.
- 这项工作为设计具有潜在治疗应用的多种生物活性酶衍生物提供了一个模块化平台.
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