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- W4317492024 abstract "Abstract Biosynthesis of D‐allulose has been achieved using ketose 3‐epimerases (KEases), but its application is limited by poor catalytic performance. In this study, we redesigned a genetically encoded biosensor based on a D‐allulose‐responsive transcriptional regulator for real‐time monitoring of D‐allulose. An ultrahigh‐throughput droplet‐based microfluidic screening platform was further constructed by coupling with this D‐allulose‐detecting biosensor for the directed evolution of the KEases. Structural analysis of Sinorhizobium fredii D‐allulose 3‐epimerase (SfDAE) revealed that a highly flexible helix/loop region exposes or occludes the catalytic center as an essential lid conformation regulating substrate recognition. We reprogrammed SfDAE using structure‐guided rational design and directed evolution, in which a mutant M3‐2 was identified with 17‐fold enhanced catalytic efficiency. Our research offers a paradigm for the design and optimization of a biosensor‐based microdroplet screening platform." @default.
- W4317492024 created "2023-01-20" @default.
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- W4317492024 date "2023-02-01" @default.
- W4317492024 modified "2023-10-14" @default.
- W4317492024 title "Substantial Improvement of an Epimerase for the Synthesis of D‐Allulose by Biosensor‐Based High‐Throughput Microdroplet Screening" @default.
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- W4317492024 doi "https://doi.org/10.1002/ange.202216721" @default.
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