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A thermostable bacterial catalase-peroxidase oxidizes phenolic compounds derived from lignins

  • Biotechnologically Relevant Enzymes and Proteins
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Abstract

Lignocellulosic biomass is rich in lignins, which represent a bottomless natural source of aromatic compounds. Due to the high chemical complexity of these aromatic polymers, their biological fractionation remains challenging for biorefinery. The production of aromatics from the biological valorization of lignins requires the action of ligninolytic peroxidases and laccases produced by fungi and bacteria. Therefore, identification of efficient ligninolytic enzymes with high stability represents a promising route for lignins biorefining. Our strategy consists in exploiting the enzymatic potential of the thermophilic bacterium Thermobacillus xylanilyticus to produce robust and thermostable ligninolytic enzymes. In this context, a gene encoding a putative catalase-peroxidase was identified from the bacterial genome. The present work describes the production of the recombinant protein, its biochemical characterization, and ligninolytic potential. Our results show that the catalase-peroxidase from T. xylanilyticus is thermostable and exhibits catalase-peroxidase and manganese peroxidase activities. The electrochemical characterization using intermittent pulse amperometry showed the ability of the enzyme to oxidize small aromatic compounds derived from lignins. This promising methodology allows the fast screening of the catalase-peroxidase activity towards small phenolic molecules, suggesting its potential role in lignin transformation.

Key points

• Production and characterization of a new thermostable bacterial catalase-peroxidase

• The enzyme is able to oxidize many phenolic monomers derived from lignins

• Intermittent pulse amperometry is promising to screen ligninolytic enzyme

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All data generated or analyzed during this study are included in this publish article and its supplementary information files.

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Funding

The authors are grateful to the Reims Champagne Ardenne University and Foundation for the funding of FI’s PhD thesis. The authors also thank the Grand Reims, the French Region Grand Est, and the European Regional Development Fund (ERDF) for CQ PhD thesis and for the financial support of the Chaire AFERE.

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Contributions

FI, OM, DB, and RH conceived and designed the research. FI and CQ conducted the experiments. FI, AS, RC, OM, DB and RH analyzed the data. All the authors contributed to the manuscript preparation, read, and approved the final manuscript.

Corresponding author

Correspondence to Harivony Rakotoarivonina.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare no competing interests.

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Fall, I., Czerwiec, Q., Abdellaoui, S. et al. A thermostable bacterial catalase-peroxidase oxidizes phenolic compounds derived from lignins. Appl Microbiol Biotechnol 107, 201–217 (2023). https://doi.org/10.1007/s00253-022-12263-9

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  • DOI: https://doi.org/10.1007/s00253-022-12263-9

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