Abstract
Artificial photoenzymes with noncanonical photo-redox cofactors have paved the way for enzyme rational design and the creation of new-to-nature biocatalysts. Genetically encoded photo-redox cofactors endow photoenzymes with enhanced or novel activities that catalyze numerous transformations with high efficiency. Herein, we describe a protocol of repurposing photosensitizer proteins (PSP) through genetic code expansion to facilitate multiple photocatalytic conversions including photo-activated dehalogenation of aryl halides, CO2 to CO and CO2 to formic acid reduction. The methods for expression, purification, and characterization of the PSP are detailed. The installation of the catalytic modules and the utilization of PSP-based artificial photoenzymes for photoenzymatic CO2 reduction and dehalogenation are also described.
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Acknowledgments
The authors are grateful to the National Key R&D Program of China (2021YFA0910802, 2019YFA0904002, 2019YFA0904103, 2020YFA0908503, 2020YFA0907701) and Sanming Project of Medicine in Shenzhen (no. SZSM201811092).
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Wang, J., **a, Y., Guo, X. (2023). Repurposing Photosensitizer Proteins Through Genetic Code Expansion to Facilitate Photo-Biocatalysis. In: Tsai, YH., Elsässer, S.J. (eds) Genetically Incorporated Non-Canonical Amino Acids. Methods in Molecular Biology, vol 2676. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3251-2_3
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