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Fungal Peroxygenases: A Phylogenetically Old Superfamily of Heme Enzymes with Promiscuity for Oxygen Transfer Reactions

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Grand Challenges in Fungal Biotechnology

Abstract

Fungal unspecific peroxygenases (UPOs, EC 1.11.2.1) form a superfamily of heme proteins and possess promiscuity for oxygen transfer reactions. The first UPO was discovered in the agaric fungus Agrocybe aegerita in 2004, and later, well-known fungal chloroperoxidase (CPO) turned out to be a phylogenetic relative (but outlier) of this enzyme type. Functionally, UPOs are extracellular monoperoxygenases that transfer one oxygen atom from a peroxide to diverse organic substrates including alkanes/alkyls, cycloalkanes/cycloalkyls, aromatics/phenyls, heterocycles, halides, etc. These target structures are subject of hydroxylation, epoxidation, O- and N-dealkylation, sulfoxidation, N-oxidation and deacylation. In many cases, the product patterns of UPOs resemble those of cytochrome P450 monooxygenases (P450), and in fact, their catalytic cycle combines characteristics of heme peroxidases and P450s (‘peroxide shunt’). Meanwhile, several thousand putative UPO sequences that form two large clusters—‘short’ and ‘long’ peroxygenases—have been found in genetic databases and fungal genomes, indicating their widespread occurrence in the whole fungal kingdom. This includes all phyla of true fungi (Eumycota) and certain pseudofungal stramenopiles (formerly known as ‘Oomycota’). Despite their ubiquitous occurrence in the fungal kingdom, only a handful of UPOs have been characterized so far, and almost nothing substantial is known on their natural function(s). Their reliable heterologous expression remains tricky, despite all recent progress in this field.

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Notes

  1. 1.

    In fact, all peroxygenases act also as peroxidases because they transfer both peroxide-borne oxygen and catalyze prototypical one-electron oxidations (see Fig. 14.8).

  2. 2.

    www.qmul.ac.uk/sbcs/iubmb/enzyme/EC1/09p.html#110201

  3. 3.

    HTP—heme thiolate peroxidase; an abbreviation/term that is synonymously used to UPO (Hofrichter and Ullrich 2006).

  4. 4.

    Note that diatoms (Bacillariophytina) belong to the stramenopiles as the Peronosporomycetes.

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Acknowledgements

The authors thank Angel T. Martínez (CIB, CSIC, Madrid), Ana Gutiérrez (IRNAS, CSIC, Sevilla), Miguel Alcalde (ICP, CSIC, Madrid), Frank Hollmann (TU Delft), Dirk Holtmann (DECHEMA, Frankfurt a.M.) and Henrik Lund (Novozymes A/S, Copenhagen) for useful discussions and information on peroxygenase activities. The financial support by the following international and German projects is acknowledged: EU projects Indox (KBBE-2013-7-613549), EnzO2 (H2020-BBI-PPP-2015-2-720297) and SusBind (H2020-BBI-PPP-2017-R5-792063), DFG Priority Program 1374 ‘Infrastructure-Biodiversity-Exploratories’ (HO 1961/6-2, KE 1742/2-2), DFG project PeroxyDiv (HO 1961/8-1) and AiF/IGF project PeroyMEER (19636BG).

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Correspondence to Martin Hofrichter .

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Hofrichter, M. et al. (2020). Fungal Peroxygenases: A Phylogenetically Old Superfamily of Heme Enzymes with Promiscuity for Oxygen Transfer Reactions. In: Nevalainen, H. (eds) Grand Challenges in Fungal Biotechnology. Grand Challenges in Biology and Biotechnology. Springer, Cham. https://doi.org/10.1007/978-3-030-29541-7_14

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