通过量子力学/分子力学,分子动力学和结构生物学研究的组合来重新设计酶
Hong-Yan Lin1, Xi Chen2, Jin Dong1
1Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China.
Journal of the American Chemical Society
|September 20, 2021
概括
酶工程的创新使新的化学反应成为可能. 研究人员使用QM/MM和模拟来重新设计4-基酸二氧化酶 (HPPD),创造产生基酸盐 (HPA) 等替代产品的突变物.
科学领域:
- 生物催化和酶工程
- 计算化学
- 结构生物学
背景情况:
- α-酸依赖的氧化酶是关键的酶,但对新产品的工程仍然具有挑战性.
- 为生物催化剂创新制定广泛适用的酶重新设计的合理策略至关重要.
- 4-基酸二氧化酶 (HPPD) 作为研究催化机制和工程工作的模型酶.
研究的目的:
- 开发和展示一个合理的4-基酸氧化酶 (HPPD) 工程策略.
- 了解HPPD的催化反应途径,并确定突变发生的关键残留物.
- 设计能够生产替代产品的HPPD变种,特别是基酸盐 (HPA).
主要方法:
- 量子力学/分子力学 (QM/MM) 计算以建模酶的活性部位和反应机制.
- 分子动态 (MD) 模拟以探索构造变化和基质结合.
- 针对位点的突变生成,以创建和表征工程HPPD变体.
- 用X射线结晶学来确定工程HPPD产品复合物的结构.
主要成果:
- 基于QM/MM和MD模拟的合理重新设计策略已成功应用于HPPD.
- 该战略阐明了HPPD的催化机制,并确定了产品多样化的途径.
- 产生了工程HPPD突变,产生基酸盐 (HPA) 作为替代产品,而不是原生同质酸盐.
- 一个与HPA复合的HPPD突变体的晶体结构证实了关键的催化中间体 (HPPD-Fe(IV) -HPA).
结论:
- 开发的战略提供了对HPPD结构功能关系的更深入的理解.
- 这种方法为合理开发新型生物催化剂提供了普遍适用的平台.
- 改造的HPPD变体显示了为新的化学合成应用创造具有改变产品特异性的酶的潜力.
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