E. coli surface display of streptavidin for directed evolution of an allylic deallylase.
E. coli surface display of streptavidin for directed evolution of an allylic deallylase.
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DOI:
10.1039/c8sc00484f
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发表时间:
2018-06-28
期刊:
影响因子:
8.4
通讯作者:
Ward TR
中科院分区:
文献类型:
--
作者:
Heinisch T;Schwizer F;Garabedian B;Csibra E;Jeschek M;Vallapurackal J;Pinheiro VB;Marlière P;Panke S;Ward TR
An artificial deallylase is constituted on the E. coli surface and genetically optimized for the deprotection of caged aminocoumarin. Artificial metalloenzymes (ArMs hereafter) combine attractive features of both homogeneous catalysts and enzymes and offer the potential to implement new-to-nature reactions in living organisms. Herein we present an E. coli surface display platform for streptavidin (Sav hereafter) relying on an Lpp-OmpA anchor. The system was used for the high throughput screening of a bioorthogonal CpRu-based artificial deallylase (ADAse) that uncages an allylcarbamate-protected aminocoumarin 1. Two rounds of directed evolution afforded the double mutant S112M–K121A that displayed a 36-fold increase in surface activity vs. cellular background and a 5.7-fold increased in vitro activity compared to the wild type enzyme. The crystal structure of the best ADAse reveals the importance of mutation S112M to stabilize the cofactor conformation inside the protein.
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通讯作者:
Mascarenas, Jose L.
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