通过理性设计改善HMG-CoA减少酶从Ruegeria pomeroyi的辅因子性
Haizhao Xue1,2, Yanzhe Huang1,2, Aabid Manzoor Shah1
1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
研究人员设计了一种关键酶,3-基-3-甲基氨基-CoA减少酶 (HMGR),以利用NADH和NADPH. 这种双辅助因子HMGR突变因子通过提高酶灵活性和基质利用来增强化物生产.
科学领域:
- 生物化学 生物化学
- 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:
- 梅瓦诺酸途径对于产生异烯酸 (IPP),所有类的前体是必不可少的.
- 3-基-3-甲基氨基-CoA减少酶 (HMGR) 是该途径中的速度限制酶,利用NAD(P) H催化HMG-CoA到美酸盐的减少.
- 增强HMGR的辅因子杂乱性可以克服基质利用的局限性,并促进类生物合成.
研究的目的:
- 为了异质地表达和描述从Escherichia coli中的Ruegeria pomeroyi中的HMGR.
- 通过理性设计,设计HMGR用于双重辅助因子利用 (NADH和NADPH).
- 评估工程HMGR突变的稳定性和催化活性.
主要方法:
- 在大肠杆菌BL21中rpHMGR的异质表达.
- 分子操作环境 (MOE) 辅助的理性设计,用于设计辅因子结合部位.
- 生物化学测试以确定野生型和突变型HMGR的酶活性,辅因子偏好和pH稳定性.
主要成果:
- HMGR主要利用NADH,而NADPH活动有限.
- 一个D154K突变物被成功改造,显示NADPH活性增加了53.7倍.
- 在广泛的pH范围 (6-8) 中,D154K突变者与NADH和NADPH都保持了高的催化活性,而不会影响稳定性.
结论:
- 理性设计有效地设计了HMGR用于双辅助因子利用,显著增强了NADPH活性.
- 突变D154K提供了更广泛的辅因子灵活性,这对于优化化物生产至关重要.
- 这项研究促进了对HMGR-辅因子相互作用的理解,并为进一步的酶工程工作提供了基础.
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