结构导向的单点突变发生和碳酸末端截断改善了7α-基固醇脱酶的基质选择性
Lina Jin1, Min Chen1, Li Yang1
1State Key Laboratory of Discovery and Utilization of Functional Components in Traditional Chinese Medicine, The SATCM Key Laboratory for New Resources & Quality Evaluation of Chinese Medicine, The MOE Key Laboratory for Standardization of Chinese Medicines and Shanghai Key Laboratory of Compound Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, PR China.
改造的7α-hydroxysteroid脱酶 (7α-HSDH) 增强了从胆粉中生产熊胆替代品的特异性. 这种酶工程策略提高了生物转化效率,并减少了不必要的副产品.
科学领域:
- 生物技术是生物技术.
- 酵素工程是什么意思 酵素工程
- 合成生物学 合成生物学
背景情况:
- 整个微生物细胞工厂提供了使用胆粉生产罕见熊胆的替代品的潜力.
- 野生类型的7α-hydroxysteroid脱酶 (7α-HSDH) 对陶罗二氧化醇酸 (TCDCA) 具有较低的特异性,导致不良的副产品.
研究的目的:
- 为了提高7α-HSDH的特异性和活动,对TCDCA进行工程设计,以实现高效的生物转化.
- 开发一个微生物细胞工厂,生产熊胆酸替代品.
主要方法:
- 7α-HSDH的结构指导工程通过活性位点导向和突变和C端截断.
- 高通量查,活性测定和酶动力学,以确定关键残留物并优化酶功能.
- 工程7α-HSDH与7β-HSDH的同时表达,用于胆粉的定向生物转化.
主要成果:
- 确定了T94作为活性部位功能的关键残留物,并证实了C端对基质特异性的重要性.
- 开发了T94FΔC1突变,对TCDCA具有很高的选择性和活性.
- 该工程酶系统成功地消除了副产品tauroursocholic acid (TUCA) 和3,12-dihydroxy-7-oxocholanoyltaurine (3,12-HOCT),产生了理想的tauroursodeoxycholic acid (TUDCA):TCDCA.的比率.
结论:
- T94残留在确定7α-HSDH基底特异性和活性方面起着至关重要的作用.
- 合理的酶设计和工程策略可以显著提高实际生物转化应用的酶特异性和催化效率.
- 这项研究为生产有价值的熊胆酸替代品提供了可行的方法.
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