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Püllmann, P.; Homann, D.; Karl, T. A.; König, B.; Weissenborn, M. J.; Light‐controlled biocatalysis by unspecific peroxygenases with genetically encoded photosensitizers Angew. Chem. Int. Ed. 62 e202307897 (2023) DOI: 10.1002/anie.202307897
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Fungal unspecific peroxygenases (UPOs) have gained substantial attention for their versatile oxyfunctionalization chemistry paired with impressive catalytic capabilities. A major drawback, however, remains their sensitivity towards their co‐substrate hydrogen peroxide, necessitating the use of smart in situ hydrogen peroxide generation methods to enable efficient catalysis setups. Herein, we introduce flavin‐containing protein photosensitizers as a new general tool for light‐controlled in situ hydrogen peroxide production. By genetically fusing flavin binding fluorescent proteins and UPOs, we have created two virtually self‐sufficient photo‐enzymes (PhotUPO). Subsequent testing of a versatile substrate panel with the two divergent PhotUPOs revealed two stereoselective conversions. The catalytic performance of the fusion protein was optimized through enzyme and substrate loading variation, enabling up to 24300 turnover numbers (TONs) for the sulfoxidation of methyl phenyl sulfide. The PhotUPO concept was upscaled to a 100 mg substrate preparative scale, enabling the extraction of enantiomerically pure alcohol products.Graphical Abstract Unspecific peroxygenases (UPOs) have recently gained attraction as versatile oxyfunctionalization catalysts. One shortcoming, however, is their susceptibility towards the co-substrate hydrogen peroxide. As a solution, the concept of light-dependent UPO biocatalysis with genetically encoded flavin-containing photosensitizer proteins for in situ hydrogen peroxide production is introduced.

Publications

Münch, J.; Soler, J.; Hünecke, N.; Homann, D.; Garcia-Borràs, M.; Weissenborn, M. J.; Computational-aided engineering of a selective unspecific peroxygenase toward enantiodivergent β-ionone hydroxylation ACS Catal. 13 8963-8972 (2023) DOI: 10.1021/acscatal.3c00702
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Unspecific peroxygenases (UPOs) perform oxy-functionalizations for a wide range of substrates utilizing H2O2 without the need for further reductive equivalents or electron transfer chains. Tailoring these promising enzymes toward industrial application was intensely pursued in the last decade with engineering campaigns addressing the heterologous expression, activity, stability, and improvements in chemo- and regioselectivity. One hitherto missing integral part was the targeted engineering of enantioselectivity for specific substrates with poor starting enantioselectivity. In this work, we present the engineering of the short-type MthUPO toward the enantiodivergent hydroxylation of the terpene model substrate, β-ionone. Guided by computational modeling, we designed a small smart library and screened it with a GC−MS setup. After two rounds of iterative protein evolution, the activity increased up to 17-fold and reached a regioselectivity of up to 99.6% for the 4-hydroxy-β-ionone. Enantiodivergent variants were identified with enantiomeric ratios of 96.6:3.4 (R) and 0.3:99.7 (S), respectively.

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