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Title: Regulation of Gene Expression during the Onset of Ligninolytic Oxidation by Phanerochaete chrysosporium on Spruce Wood

Journal Article · · Applied and Environmental Microbiology
DOI:https://doi.org/10.1128/AEM.02064-15· OSTI ID:1470155
 [1];  [2];  [2];  [2];  [2];  [3];  [3]
  1. Mahatma Gandhi Univ., Nalgonda (India). Dept. of Biotechnology
  2. Forest Products Lab., Madison, WI (United States)
  3. Forest Products Lab., Madison, WI (United States); Univ. of Wisconsin, Madison, WI (United States). Dept. of Bacteriology

Since uncertainty remains about how white rot fungi oxidize and degrade lignin in wood, it would be useful to monitor changes in fungal gene expression during the onset of ligninolysis on a natural substrate. In this paper, we grew Phanerochaete chrysosporium on solid spruce wood and included oxidant-sensing beads bearing the fluorometric dye BODIPY 581/591 in the cultures. Confocal fluorescence microscopy of the beads showed that extracellular oxidation commenced 2 to 3 days after inoculation, coincident with cessation of fungal growth. Whole transcriptome shotgun sequencing (RNA-seq) analyses based on the v.2.2 P. chrysosporium genome identified 356 genes whose transcripts accumulated to relatively high levels at 96 h and were at least four times the levels found at 40 h. Transcripts encoding some lignin peroxidases, manganese peroxidases, and auxiliary enzymes thought to support their activity showed marked apparent upregulation. The data were also consistent with the production of ligninolytic extracellular reactive oxygen species by the action of manganese peroxidase-catalyzed lipid peroxidation, cellobiose dehydrogenase-catalyzed Fe3+ reduction, and oxidase-catalyzed H2O2 production, but the data do not support a role for iron-chelating glycopeptides. In addition, transcripts encoding a variety of proteins with possible roles in lignin fragment uptake and processing, including 27 likely transporters and 18 cytochrome P450s, became more abundant after the onset of extracellular oxidation. Genes encoding cellulases showed little apparent upregulation and thus may be expressed constitutively. Finally, transcripts corresponding to 165 genes of unknown function accumulated more than 4-fold after oxidation commenced, and some of them may merit investigation as possible contributors to ligninolysis.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0006929
OSTI ID:
1470155
Journal Information:
Applied and Environmental Microbiology, Vol. 81, Issue 22; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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Genetic Bases of Fungal White Rot Wood Decay Predicted by Phylogenomic Analysis of Correlated Gene-Phenotype Evolution journal November 2016
Lignin-degrading peroxidases in white-rot fungus Trametes hirsuta 072. Absolute expression quantification of full multigene family journal March 2017
Degradation of antifungal anthraquinone compounds is a probable physiological role of DyP secreted by Bjerkandera adusta journal April 2019
Transcription of lignocellulose-decomposition associated genes, enzyme activities and production of ethanol upon bioconversion of waste substrate by Phlebia radiata journal May 2018
Oak extractive-induced stress reveals the involvement of new enzymes in the early detoxification response of Phanerochaete chrysosporium: Early fungal responses to oak extractives journal October 2018
Localizing gene regulation reveals a staggered wood decay mechanism for the brown rot fungus Postia placenta journal September 2016
Deciphering lignocellulose deconstruction by the white rot fungus Irpex lacteus based on genomic and transcriptomic analyses journal March 2018
Gene Co-expression Network Reveals Potential New Genes Related to Sugarcane Bagasse Degradation in Trichoderma reesei RUT-30 journal October 2018
Heterologous Production and Characterization of Two Glyoxal Oxidases from Pycnoporus cinnabarinus journal June 2016
Time-scale dynamics of proteome and transcriptome of the white-rot fungus Phlebia radiata: growth on spruce wood and decay effect on lignocellulose journal September 2016
Genome Sequence of the Edible Cultivated Mushroom Lentinula edodes (Shiitake) Reveals Insights into Lignocellulose Degradation journal August 2016
Dynamics of the Phanerochaete carnosa transcriptome during growth on aspen and spruce journal November 2018