Description of the first fungal dye-decolorizing peroxidase oxidizing manganese(II)

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Abstract

Two phylogenetically divergent genes of the new family of dye-decolorizing peroxidases (DyPs) were found during comparison of the four DyP genes identified in the Pleurotus ostreatus genome with over 200 DyP genes from other basidiomycete genomes. The heterologously expressed enzymes (Pleos-DyP1 and Pleos-DyP4, following the genome nomenclature) efficiently oxidize anthraquinoid dyes (such as Reactive Blue 19), which are characteristic DyP substrates, as well as low redox-potential dyes (such as 2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)) and substituted phenols. However, only Pleos-DyP4 oxidizes the high redox-potential dye Reactive Black 5, at the same time that it displays high thermal and pH stability. Unexpectedly, both enzymes also oxidize Mn2+ to Mn3+, albeit with very different catalytic efficiencies. Pleos-DyP4 presents a Mn2+ turnover (56 s−1) nearly in the same order of the two other Mn2+-oxidizing peroxidase families identified in the P. ostreatus genome: manganese peroxidases (100 s−1 average turnover) and versatile peroxidases (145 s−1 average turnover), whose genes were also heterologously expressed. Oxidation of Mn2+ has been reported for an Amycolatopsis DyP (24 s−1) and claimed for other bacterial DyPs, albeit with lower activities, but this is the first time that Mn2+ oxidation is reported for a fungal DyP. Interestingly, Pleos-DyP4 (together with ligninolytic peroxidases) is detected in the secretome of P. ostreatus grown on different lignocellulosic substrates. It is suggested that generation of Mn3+ oxidizers plays a role in the P. ostreatus white-rot lifestyle since three different families of Mn2+-oxidizing peroxidase genes are present in its genome being expressed during lignocellulose degradation.

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Fernández-Fueyo, E., Linde, D., Almendral, D., López-Lucendo, M. F., Ruiz-Dueñas, F. J., & Martínez, A. T. (2015). Description of the first fungal dye-decolorizing peroxidase oxidizing manganese(II). Applied Microbiology and Biotechnology, 99(21), 8927–8942. https://doi.org/10.1007/s00253-015-6665-3

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