Structural highlights
FunctionPublication Abstract from PubMedArtificial photoenzymes with novel catalytic modes not found in nature are in high demand; yet, they also present significant challenges in the field of biocatalysis. In this study, a chemogenetic modification strategy is developed to facilitate the rapid diversification of photoenzymes. This strategy integrates site-specific chemical conjugation of various artificial photosensitizers into natural protein cavities and the iterative mutagenesis in cell lysates. Through rounds of directed evolution, prominent visible-light-activatable photoenzyme variants were developed, featuring a thioxanthone chromophore. They successfully enabled the enantioselective [2 + 2] photocycloaddition of 2-carboxamide indoles, a class of UV-sensitive substrates that are traditionally challenging for known photoenzymes. Furthermore, the versatility of this photoenzyme is demonstrated in enantioselective whole-cell photobiocatalysis, enabling the efficient synthesis of enantioenriched cyclobutane-fused indoline tetracycles. These findings significantly expand the photophysical properties of artificial photoenzymes, a critical factor in enhancing their potential for harnessing excited-state reactivity in stereoselective transformations. Chemogenetic Evolution of Diversified Photoenzymes for Enantioselective [2 + 2] Cycloadditions in Whole Cells.,Guo J, Qian J, Cai D, Huang J, Yang X, Sun N, Zhang J, Pang T, Zhao W, Wu G, Chen X, Zhong F, Wu Y J Am Chem Soc. 2024 Jul 17;146(28):19030-19041. doi: 10.1021/jacs.4c03087. Epub , 2024 Jul 8. PMID:38976645[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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