Abstract
Haem peroxygenases are attractive biocatalysts for incorporating oxygen into organic molecules using H2O2. However, their practical applications are hindered by irreversible oxidative inactivation due to exogenous H2O2 usage. Here we present an alternative catalytic route in haem peroxygenases that uses O2 and small-molecule reductants such as ascorbic acid and dehydroascorbic acid (DHA) to drive reactions. Our experimental and computational studies indicated that DHAA, the hydrated form of DHA, serves as the key co-substrate that activates oxygen to generate the active oxyferryl haem compound I. We also demonstrate the broad applicability of this O2/reductant-dependent route across various haem peroxygenases, highlighting its biological significance for mono-oxygenase functionality. Importantly, this innovative route avoids the use of H2O2, thereby preventing the risk of irreversible enzyme inactivation. Finally, scaled-up reactions yielded chiral, value-added products with excellent productivity, underscoring the synthetic potential of this developed peroxygenase technology for sustainable chemical transformations.

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The data that support the findings of this study are available within the main text and its Supplementary Information or from the authors upon reasonable request. Source data are provided with this paper.
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Acknowledgements
This study was supported by the National Key Research and Development Program of China (grant number 2019YFA09005000 (A.L.)), the National Natural Science Foundation of China (grant number 32371552 (A.L.), 22122305 (B.W.)) and the Research Program of State Key Laboratory of Biocatalysis and Enzyme Engineering. We also thank X. Xu and X. Liu for helpful discussions and support.
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A.L. and B.W. conceived and supervised the project. D.D., Z.J., L.K., L.L., X.Z., Y.Q., Y.Z. and L.Y. performed the experiments and analysed the data. A.L., B.W., D.D. and Z.J. wrote the manuscript. All authors checked and modified the manuscript.
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Deng, D., Jiang, Z., Kang, L. et al. An efficient catalytic route in haem peroxygenases mediated by O2/small-molecule reductant pairs for sustainable applications. Nat Catal 8, 20–32 (2025). https://doi.org/10.1038/s41929-024-01281-7
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DOI: https://doi.org/10.1038/s41929-024-01281-7
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