重建动态关联网络,通过设计远端链间二硫化物键,同时提高2,3-butanediol脱酶的活性和稳定性
Zhongji Pu1, Jiawen Cao2, Wenhui Wu3
1Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; ZJU-Hangzhou Global Scientific and Technological Innovation Centre, Hangzhou, Zhejiang 311200, China; Xianghu Laboratory, Hangzhou 311231, China.
通过引入二硫化键,工程师提高了酶的稳定性和活性,从而增强了2,3-butanediol脱酶 (2,3-BDH) 的功能. 这种策略重建了酶.
科学领域:
- 生物化学和分子生物学
- 酶工程是什么? 酶工程是什么?
- 蛋白质动力学 蛋白质动力学
背景情况:
- 酶活性,稳定性和动力学是复杂的相互关联.
- 定向进化往往导致酶活性和稳定性之间的权衡.
- 为了提高活性和稳定性,工程酶仍然是一个重大挑战.
研究的目的:
- 重建2,3-butanediol脱酶 (2,3-BDH) 的动态关联网络,以提高其活性和稳定性.
- 研究链间二硫化物键对酶动力学,活性和稳定性的影响.
- 为提供有关酶设计的见解,以共同进化稳定性和活性.
主要方法:
- 计算策略来评估二硫化物键对酶性质的影响.
- 位点定向的突变发生引入链间二硫化物键 (CgBDH中的N258C突变).
- 热展开测试,半衰期测量和催化效率的确定 (kcat/Km).
- 模拟分子动力学以分析动力学相关性网络中的变化.
主要成果:
- 在CgBDH中的N258C突变显著增强了活性和稳定性.
- 突变酶表现出更高的化温度和14.8倍更长的半衰期.
- 原生基质的催化效率增加了7.9倍,非原生基质的催化效率增加了8.8倍.
- 分子动力学揭示了一个重建的相互作用网络,减少了灵活性和"锁定"反应性姿势.
结论:
- 引入链间二硫化物键是一种有效的策略,可以同时提高酶的稳定性和活性.
- 修改酶的动态相关联网络对于调整活性和选择性至关重要.
- 这项研究为设计具有共同进化的稳定性和活性的新型酶提供了宝贵的见解.
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