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Dichomitus squalens partially tailors its molecular responses to the composition of solid wood: Responses of Dichomitus squalens to solid wood

Journal Article · · Environmental Microbiology
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  1. Fungal Physiology, Westerdijk Fungal Biodiversity Institute and Fungal Molecular Physiology, Utrecht University, Utrecht The Netherlands
  2. Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Utrecht The Netherlands
  3. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland WA USA
  4. Biological Sciences Division, Pacific Northwest National Laboratory, Richland WA USA
  5. US Department of Energy Joint Genome Institute, Walnut Creek CA USA
  6. Department of Microbiology, University of Helsinki, Helsinki Finland
  7. Fungal Physiology, Westerdijk Fungal Biodiversity Institute and Fungal Molecular Physiology, Utrecht University, Utrecht The Netherlands; Department of Microbiology, University of Helsinki, Helsinki Finland
White-rot fungi, such as Dichomitus squalens, degrade all wood components and inhabit mixed wood forests containing both soft- and hardwood species. In this study, we evaluated how D. squalens responded to the compositional differences in softwood (guaiacyl (G) lignin and higher mannan content) and hardwood (syringyl/guaiacyl (S/G) lignin and higher xylan content) using semi-natural solid cultures. Spruce (softwood) and birch (hardwood) sticks were degraded by D. squalens as measured by oxidation of the lignins using 2D-NMR. The fungal response as measured by transcriptomics, proteomics and enzyme activities showed a partial tailoring to wood composition. Mannanolytic transcripts and proteins were more abundant in spruce cultures, while a proportionally higher xylanolytic activity was detected in birch cultures. Both wood types induced manganese peroxidases to a much higher level than laccases, but higher transcript and protein levels of the manganese peroxidases were observed on the G-lignin rich spruce. Overall, the molecular responses demonstrated a stronger adaptation to the spruce rather than birch composition, possibly because D. squalens is mainly found degrading softwoods in nature, which supports the ability of the solid wood cultures to reflect the natural environment.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1503505
Report Number(s):
PNNL-SA-135900
Journal Information:
Environmental Microbiology, Journal Name: Environmental Microbiology Journal Issue: 11 Vol. 20; ISSN 1462-2912
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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An Italian Research Culture Collection of Wood Decay Fungi journal February 2020
Draft Genome Sequences of Three Monokaryotic Isolates of the White-Rot Basidiomycete Fungus Dichomitus squalens journal May 2019
Fungal Treatment Modifies Kraft Lignin for Lignin- and Cellulose-Based Carbon Fiber Precursors journal March 2020

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