Applied Microbiology and Biotechnology

, Volume 102, Issue 24, pp 10579–10588 | Cite as

Characterization and use of a bacterial lignin peroxidase with an improved manganese-oxidative activity

  • Elisa Vignali
  • Fabio Tonin
  • Loredano Pollegioni
  • Elena RosiniEmail author
Biotechnologically relevant enzymes and proteins


Peroxidases are well-known biocatalysts produced by all organisms, especially microorganisms, and used in a number of biotechnological applications. The enzyme DypB from the lignin-degrading bacterium Rhodococcus jostii was recently shown to degrade solvent-obtained fractions of a Kraft lignin. In order to promote the practical use, the N246A variant of DypB, named Rh_DypB, was overexpressed in E. coli using a designed synthetic gene: by employing optimized conditions, the enzyme was fully produced as folded holoenzyme, thus avoiding the need for a further time-consuming and expensive reconstitution step. By a single chromatographic purification step, > 100 mg enzyme/L fermentation broth with a > 90% purity was produced. Rh_DypB shows a classical peroxidase activity which is significantly increased by adding Mn2+ ions: kinetic parameters for H2O2, Mn2+, ABTS, and 2,6-DMP were determined. The recombinant enzyme shows a good thermostability (melting temperature of 63–65 °C), is stable at pH 6–7, and maintains a large part of the starting activity following incubation for 24 h at 25–37 °C. Rh_DypB activity is not affected by 1 M NaCl, 10% DMSO, and 5% Tween-80, i.e., compounds used for dye decolorization or lignin-solubilization processes. The enzyme shows broad dye-decolorization activity, especially in the presence of Mn2+, oxidizes various aromatic monomers from lignin, and cleaves the guaiacylglycerol-β-guaiacyl ether (GGE), i.e., the Cα-Cβ bond of the dimeric lignin model molecule of β-O-4 linkages. Under optimized conditions, 2 mM GGE was fully cleaved by recombinant Rh_DypB, generating guaiacol in only 10 min, at a rate of 12.5 μmol/min mg enzyme.


Lignin peroxidase Dye-decolorizing peroxidase Ligninolytic enzymes Lignin valorization Heme incorporation 



E.V. is a PhD student of the “Life Sciences and Biotechnology” course at Università degli studi dell’Insubria.

Funding information

We thank the financial support from CIB, Consorzio Interuniversitario per le Biotecnologie.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

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


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Biotechnology and Life SciencesUniversity of InsubriaVareseItaly
  2. 2.Department of BiotechnologyDelft University of TechnologyDelftThe Netherlands

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