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Expression and molecular properties of a new laccase of the white rot fungus Phlebia radiata grown on wood

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Abstract

Laccases are phenol-oxidizing, multicopper enzymes produced by fungi, plants, insects and bacteria. Fungal laccases are involved in ecologically important processes such as decomposition of lignocellulose (wood and plant material). In this work, in order to find out the role of fungal laccases upon wood colonisation and lignin decay, we describe expression of laccase-encoding genes in the white rot basidiomycete Phlebia radiata 79, when the fungus grows on its natural substrates, that is on softwood (Alnus incana) and hardwood (Picea abies). Clones for two laccase-encoding genes, the previously described Pr-lac1 and a new gene Pr-lac2 were characterized. Pr-lac2 coding region is interrupted by 12 introns and the deduced Lac2 protein displays a higher pI value (5.8) than Lac1 (pI 3.2–3.5). Phylogenetic analysis indicates differential evolution for the two laccases, and Lac2 demonstrates the highest sequence identity with Trametes laccases (66%). Transcripts of Pr-lac1 were the most abundant both in solid-state softwood and semi-solid hardwood cultures, as analyzed by competitive RT-PCR and Northern hybridization. On spruce wood chips, Pr-lac1 and Pr-lac2 were expressed within 2–3 weeks of growth together with manganese and lignin peroxidase-encoding genes. Our results indicate wood-promoted but time-dependent regulation of expression for the two, at protein and gene level distinct P. radiata laccases.

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Acknowledgments

The Viikki Graduate School of Biosciences doctoral study positions for M. Mäkelä and T. Hakala, and financial support from the Academy of Finland (grants no. 53305 and 205027) to the Center of Excellence on Microbial Resources, and University of Helsinki (project no. 2108015) is gratefully acknowledged.

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  1. Terhi K. Hakala

    Present address: KCL Science and Consulting, P.O. Box 70, 02151, Espoo, Finland

Authors and Affiliations

  1. Department of Applied Chemistry and Microbiology, Division of Microbiology, University of Helsinki, P.O. Box 56, Viikki Biocenter 1, 00014, Helsinki, Finland

    Miia R. Mäkelä, Kristiina S. Hildén, Terhi K. Hakala, Annele Hatakka & Taina K. Lundell

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  1. Miia R. Mäkelä
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  2. Kristiina S. Hildén
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Correspondence to Taina K. Lundell.

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Mäkelä, M.R., Hildén, K.S., Hakala, T.K. et al. Expression and molecular properties of a new laccase of the white rot fungus Phlebia radiata grown on wood. Curr Genet 50, 323–333 (2006). https://doi.org/10.1007/s00294-006-0090-1

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