Programming Integrative Multienzyme Systems and Ionic Strength For Recyclable Synthesis of Glutathione.

Xiangwei Cui, Zeyuan Wang, Zonglin Li, Xing Zhang, Zhimin Li

Journal of agricultural and food chemistry 2021 Apr 07

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In the enzymatic cascade catalysis, it is a big challenge to construct a stable and reusable catalyst with targeted enzymes. The artificial multienzyme reactor has attracted great attention due to its potential for facilitating the performance of enzyme catalysis. In this study, we set up a reliable system that could assemble polyphosphate kinase (PPK) with bifunctional glutathione synthetase (GshF) via SpyCatcher/SpyTag to form multienzyme systems (MESs). Furthermore, MESs could assemble into nanoaggregates by altering the ionic strength, and the larger nanoaggregates could be applied in robust and reusable synthesis of glutathione (GSH). To enhance MES levels in vivo, gene duplication and different coexpression modes were performed. Finally, the optimized production of GSH and oxidized glutathione (GSSG) reached 102.6 and 6.7 mM within 2 h. Compared with the first round, the total yield only decreased by 9.4% after five continuous rounds of biocatalysis.

Citation

Xiangwei Cui, Zeyuan Wang, Zonglin Li, Xing Zhang, Zhimin Li. Programming Integrative Multienzyme Systems and Ionic Strength For Recyclable Synthesis of Glutathione. Journal of agricultural and food chemistry. 2021 Apr 07;69(13):3887-3894