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  1. High-resolution solution-state NMR of unfractionated plant cell walls

    Detailed structural studies on the plant cell wall have traditionally been difficult. NMR is one of the preeminent structural tools, but obtaining high-resolution solution-state spectra has typically required fractionation and isolation of components of interest. With recent methods for dissolution of, admittedly, finely divided plant cell wall material, the wall can...

    Author(s):
    John Ralph; Fachuang Lu; Hoon Kim; Dino Ress; Daniel J. Yelle; Kenneth E. Hammel; Sally A. Ralph; Bernadette Nanayakkara; Armin Wagner; Takuya Akiyama; Paul F. Schatz; Shawn D. Mansfield; Noritsugu Terashima; Wout Boerjan; Bjorn Sundberg; Mattias Hedenstrom
    Year:
    2009
    Keywords:
    Nuclear magnetic resonance spectroscopy, plant cell walls, spectrum analysis, lignin analysis, acetylation, polysaccharides, biotechnology, analytic chemistry, multivariate analysis, chemical composition, chemometrics, wood chemistry
    Source:
    Proceedings of the 15th International Symposium on Wood, Fiber and Pulping Chemistry. 2009 June 15-18, Oslo, Norway. (P-105) Oslo, Norway: Congress-Conference AS, 2009: [4] p.

  2. Role of fungal peroxidases in biological ligninolysis

    The degradation of lignin by filamentous fungi is a major route for the recycling of photosynthetically fixed carbon, and the oxidative mechanisms employed have potential biotechnological applications. The lignin peroxidases (LiPs), manganese peroxidases (MnPs), and closely related enzymes of white rot basidiomycetes are likely contributors to fungal ligninolysis. Many...

    Author(s):
    Kenneth E. Hammel; Dan Cullen
    Year:
    2008
    Keywords:
    Genomes, fungi, genetics, oxidases, peroxidases, lignin, biodegradation, enzymes, biodegradation, industrial applications, fungal enzymes, biotechnology, Basidiomycetes, white rot
    Source:
    Current opinion in plant biology. Vol. 11 (2008): Pages 349-355

  3. Two-Dimensional NMR Evidence for Cleavage of Lignin and Xylan Substituents in Wheat Straw Through Hydrothermal Pretreatment and Enzymatic Hydrolysis

    Solution-state two-dimensional (2D) nuclear magnetic resonance (NMR) spectroscopy of plant cell walls is a powerful tool for characterizing changes in cell wall chemistry during the hydrothermal pretreatment process of wheat straw for second-generation bioethanol production. One-bond 13C-1H NMR correlation spectroscopy, via...

    Author(s):
    Daniel J. Yelle; Prasad Kaparaju; Christopher G. Hunt; Kolby Hirth; Hoon Kim; John Ralph; Claus Felby
    Year:
    2012
    Keywords:
    wheat straw, hydrothermal, lignin, polysaccharides, O-acetyls, β-aryl ethers, Uronic acids, Cinnamates
    Source:
    Bioenerg. Res

  4. Significant alteration of gene expression in wood decay fungi Postia placenta and Phanerochaete chrysosporium by plant species

    Identification of specific genes and enzymes involved in conversion of lignocellulosics from an expanding number of potential feedstocks is of growing interest to bioenergy process development. The basidiomycetous wood decay fungi Phanerochaete chrysosporium and Postia placenta are promising in this regard because they are able to utilize a wide range of simple and...

    Author(s):
    Amber Vanden Wymelenberg; Jill Gaskell; Michael Mozuch; Sandra Splinter BonDurant; Grzegorz Sabat; John Ralph; Oleksandr Skyba; Shawn D. Mansfield; Robert A. Blanchette; Igor Grigoriev; Philip J. Kersten; Daniel Cullen
    Year:
    2011
    Keywords:
    Wood-decaying fungi, brown rot, biotechnology, lignocellulose, biodegradation, industrial applications, fungi genetics, molecular genetics, wood biodegradation, Basidiomycetes, cellulose, lignin, chemical reactions, aspen, gene expression, Postia placenta, mass spectrometry, genetic transcription, Phanerochaete chrysosporium, Populus grandidentata, Pinus strobus, pine, microbial metabolism, proteins, hemicellulose, enzymes, biotechnology, feedstock, biomass energy, decay, fungi, wood decay, white rot, bioconversion, biomass fuel, wood as fuel, species differences, secretome
    Source:
    Applied and environmental microbiology. Vol. 77, no. 13 (July 2011): p. 4499-4507.

  5. Fungal lignin peroxidase does not produce the veratryl alcohol cation radical as a diffusible ligninolytic oxidant

    Peroxidases are considered essential agents of lignin degradation by white-rot basidiomycetes. However, low-molecularweight oxidants likely have a primary role in lignin breakdown because many of these fungi delignify wood before its porosity has sufficiently increased for enzymes to infiltrate. It has been proposed that lignin peroxidases (LPs, EC 1.11.1.14) fulfill...

    Author(s):
    Carl J. Houtman; Eranda Maligaspe; Christopher G. Hunt; Elena Fernández-Fueyo; Angel T. Martínez; Kenneth E. Hammel
    Year:
    2018
    Keywords:
    White rot fungus, lignin biodegradation, peroxidase, aryl cation radical
    Source:
    Journal of Biological Chemistry. 293(13): 4702-4712.
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