挖掘独特的氨酸合成酶和通过道工程彻底消除反抑制的计算研究
Shuai Xu1, Zong-Lin Li1, Zhi-Min Li1,2
1State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China.
Protein science : a publication of the Protein Society
|September 14, 2024
概括
研究人员设计了一种酶 (O-phosphoserine sulfhydrylase) 来克服L-氨酸生产的限制. 经过修改的酶消除了产品抑制,使得工业应用的高效L-氨酸合成成为可能.
科学领域:
- 生物催化剂是一种生物催化剂.
- 合成生物学 合成生物学
- 酵素工程是什么? 酶工程是什么
背景情况:
- 氨酸对制药和农业至关重要.
- 当前的生产方法面临着局限性,特别是反抑制.
- 在L-氨酸生物合成中,O-氨酸硫酸酶 (O-phosphoserine sulfhydrylases,OPSS) 是一个关键的酶.
研究的目的:
- 为了改造Acetobacterium sp. 的结构. 通过OPSS (AsOPSS) 克服L-氨酸反抑制.
- 为了提高工业L-氨酸生产的酶效率.
- 研究改善酶性能的结构和动态基础.
主要方法:
- 数据库挖掘用于识别高度活跃的OPSS.
- 半理性的酶设计和道分析.
- 分子对接,分子动力学和雨采样模拟.
主要成果:
- 鉴定并描述了具有显著L-氨酸反抑制 (IC50 = 1.2 mM) 的AsOPSS.
- 设计的AsOPSS变种 (AsOPSSA218R) 完全消除了产品抑制,而没有降低催化效率.
- 结构和动态分析显示,在AsOPSSA218R中有一个新的产品发布道.
- 使用工程酶在2小时内实现了体外L-氨酸的产量超过45毫米的L-氨酸.
结论:
- 人工产生的产品释放通道可以缓解酶反抑制.
- 设计的AsOPSSA218R为高效的L-氨酸生产提供了基础.
- 这项工作提供了关于克服产品抑制的酶设计策略的见解.
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