理性设计工程的5 - 氨基levulinate合成酶与活动和稳定性增强增强
Shuang Du1, Nan Zheng1, Zehua Zhang1
1Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China.
Journal of agricultural and food chemistry
|January 8, 2025
概括
经过工程设计的5-氨基诺列维氨酸合成酶 (ALAS) 酶显示活性增加了7倍. 纳米颗粒上的固定保持了工业应用的高酶稳定性.
科学领域:
- 生物催化和酶工程 生物催化和酶工程
- 蛋白质工程是指蛋白质的工程.
- 代谢工程是代谢工程.
背景情况:
- 5 - 氨基诺列维氨酸合成酶 (ALAS) 对于5 - 氨基诺列维氨酸 (ALA) 合成至关重要.
- 野生类型的ALAS具有较低的催化效率和稳定性,限制了其工业用途.
研究的目的:
- 通过蛋白质工程来增强ALAS的活性和稳定性.
- 为了开发一个改进的生物催化剂来合成ALA.
主要方法:
- 同热压缩性扰动工程与热稳定性预测算法相结合.
- 局部导向的突变发生,以产生T6变体 (I325M/V390Y/H391I).
- 在磁性基托纳米颗粒上进行分子动力学模拟和酶固定.
主要成果:
- 与野生型ALAS相比,T6突变体的特定活性增加了7.0倍 (2.53U/mg).
- 分子动力学揭示了T6.6中改善的分子间相互作用,基质通道和结合口袋.
- 固定T6在10个反应周期后保持了73.5%的活性.
结论:
- 一个优越的ALAS变体 (T6) 通过工程方法的组合成功构建.
- 这项研究为ALA合成提供了一种新的策略,并为工业酶优化提供了一个基准.
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