Transcriptional profiles of laccase genes in the brown rot fungus Postia placenta MAD-R-698

Hongde An; Dongsheng Wei; Tingting Xiao

doi:10.1007/s12275-015-4705-4

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Transcriptional profiles of laccase genes in the brown rot fungus Postia placenta MAD-R-698: Hongde An , Dongsheng Wei , Tingting Xiao; Journal of Microbiology 2015;53(9):606-615.
DOI: https://doi.org/10.1007/s12275-015-4705-4
Published online: August 1, 2015

Department of Microbiology, College of Life Science, Nankai University, Tianjin 300071, P. R. China

Corresponding author: Dongsheng Wei , Tel: +86-15822534610,

Received: 12 December 2014 • Revised: 16 June 2015 • Accepted: 23 June 2015

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Abstract

One of the laccase isoforms in the brown rot fungus Postia placenta is thought to contribute to the production of hydroxyl radicals, which play an important role in lignocellulose degradation. However, the presence of at least two laccase isoforms in this fungus makes it difficult to understand the details of this mechanism. In this study, we systematically investigated the transcriptional patterns of two laccase genes, Pplcc1 and Pplcc2, by quantitative PCR (qPCR) to better understand the mechanism. The qPCR results showed that neither of the two genes was expressed constitutively throughout growth in liquid culture or during the degradation of a woody substrate. Transcription of Pplcc1 was upregulated under nitrogen depletion and in response to a high concentration of copper in liquid culture, and during the initial colonization of intact aspen wafer. However, it was subject to catabolite repression by a high concentration of glucose. Transcription of Pplcc2 was upregulated by stresses caused by ferulic acid, 2, 6-dimethylbenzoic acid, and ethanol, and under osmotic stress in liquid culture. However, the transcription of Pplcc2 was downregulated upon contact with the woody substrate in solid culture. These results indicate that Pplcc1 and Pplcc2 are differentially regulated in liquid and solid cultures. Pplcc1 seems to play the major role in producing hydroxyl radicals and Pplcc2 in the stress response during the degradation of a woody substrate.

Keywords: brown rot fungi;laccase;Postia placenta;qPCR;transcriptional regulation

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Transcriptional profiles of laccase genes in the brown rot fungus Postia placenta MAD-R-698

J. Microbiol. 2015;53(9):606-615. Published online August 1, 2015

DOI: https://doi.org/10.1007/s12275-015-4705-4

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