设计一个[FeFe]-酶:辅助集群是否影响O2阻力和催化偏差?
Giorgio Caserta1, Cecilia Papini1, Agnieszka Adamska-Venkatesh2
1Laboratoire de Chimie des Processus Biologiques , Collège de France, Université Pierre et Marie Curie, CNRS UMR 8229, PSL Research University , 11 place Marcelin Berthelot , 75005 Paris , France.
Journal of the American Chemical Society
|March 30, 2018
概括
工程化[FeFe]酶 (HydAs) 显示出增强的氧气抵抗和质子减小活性. 一个截断的版本 (MeH-HydA) 保留了关键特征,为生产提供了更简单,更强大的生物催化剂.
科学领域:
- 生物催化
- 酶工程
- 生物的生产
背景情况:
- [FeFe]-酶 (HydAs) 对于H2的产生至关重要,但由于氧的敏感性和复杂性而受到限制.
- 巨 (Megasphaera elsdenii HydA,简称MeHydA) 呈现出显著的抗氧性.
- 在HydAs中的辅助铁硫集群有助于它们的复杂性.
研究的目的:
- 设计一种简化且耐氧的[FeFe]酶.
- 为了研究缺少辅助集群的截断MeHydA (MeH-HydA) 的催化特性.
- 增强酶活性和减少质子偏差.
主要方法:
- 切断蛋白质以产生MeH-HydA.
- 在实验室组装活性H集群.
- 进行光谱和生化表征.
- 对酶和质子减少的酶活性测定.
主要成果:
- 在MeH-HydA中的功能性活性位点组合 in vitro.
- MeH-HydA保留了MeHydA的氧气阻力.
- 截断通过改变催化速率限制步骤来增强质子减小偏差.
- MeH-HydA表现出很好的酶活性.
结论:
- 工程HydAs可以将抗氧与简化结构相结合.
- MeH-HydA为生产提供了强大而高效的生物催化剂.
- 这项工作为更简单,更有弹性的酶铺平了道路.
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