半理性工程的7β-基固醇脱酶增强了前置反应活动向ursodeoxycholic酸合成
Xiubing Xie1, Runyi Huang1, Wenchi Zhang2
1School of Biotechnology, Jiangnan University, Wuxi 214122, China.
International journal of biological macromolecules
|January 1, 2025
概括
工程设计的7β-基类固醇脱酶 (7β-HSDH) 通过增加前置反应活性来增强ursodeoxycholic acid (UDCA) 的产生. 一种新型突变物显著提高了酶合系统中的UDCA产量和稳定性.
科学领域:
- 生物催化剂是一种生物催化剂.
- 酵素工程是什么? 酶工程是什么
- 代谢工程是代谢工程.
背景情况:
- 7β-基类固醇脱酶 (7β-HSDH) 催化了一种可逆反应,该反应对乌尔索二氧化醇酸 (UDCA) 生产至关重要.
- 该酶的低前置反应速度限制了有效的UDCA合成.
研究的目的:
- 设计7β-HSDH以增强前置反应活性和改善UDCA生产.
- 为了重新平衡酶的基质和产品亲和力,以获得更好的催化效率.
主要方法:
- 这是Hyphomicrobium sp.的虚拟突变. 7β-HSDH (Hs7β-HSDH) 基于7 - 基托利霍克酸 (7K-LCA) 和UDCA的自动对接.
- 三轮查以确定一个主导突变 (F152L/W101N).
- 集成基于葡萄糖脱酶的辅因子再生系统,用于连续的UDCA合成.
主要成果:
- 突变F152L/W101N的前置反应活动增加了3.2倍,反向反应活动减少了3.6倍.
- 突变体对7K-LCA的结合亲和力 (Km) 提高了3.2倍,催化效率 (kcat/Km) 增加了4.3倍.
- 酶合系统以1毫米的NADH实现了92.8%的产量,并在多个批次中保持了高产量.
结论:
- 半理性设计成功地提高了7β-HSDH对其基质和产品的亲和力.
- 工程酶和合系统为高效的UDCA制剂提供了有效的策略.
- 这种方法为优化可逆酶反应提供了一种有价值的方法.
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