Degradation of wood by the basidiomyceteCoriolopsis occidentalis

Homolka, Ladislav; Nerud, F.; Kofroňová, Olga; Novotná, Eva; Machurová, V.

doi:10.1007/bf02814527

Cited by 8 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LCI of other basidiomycetes in decay class 4 suggested that they are also likely to be simultaneous whiterot fungi. Although the wood decay activity of C. retropicta, another frequent lignicolous sporocarp of southeast Asian tropical forests (Yamashita et al 2009), has not yet been reported, some tropical species in the genus Coriolopsis such as C. polyzona (Nerud et al 1991;de Koker et al 2000;Cui 2009) and its synonym C. occidentalis (Nerud and Misˇurcova´1989;Homolka et al 1994), and C. floccosa (formerly denoted C. rigida) (Capelari and Zadrazil 1997;Saparrat et al 2002) are known to be simultaneous white-rot fungi as are temperate species such as C. gallica (Go´mez-Alarco´n et al 1991). The wood decay activity of X. spectabilis is not known.…”

Section: Discussionmentioning

confidence: 99%

Fungal decomposition of woody debris of Castanopsis sieboldii in a subtropical old‐growth forest

Fukasawa

Osono

Takeda

2011

Ecological Research

View full text Add to dashboard Cite

Fungi, especially basidiomycetes, are the primary agents of woody debris decomposition in terrestrial forest ecosystems. However, quantitative data regarding the abundance and decay activity of woodinhabiting fungi are lacking, especially for tropical and subtropical areas. This study demonstrates the dynamics of decay columns of wood-inhabiting fungi within decaying woody debris of Castanopsis sieboldii and the wood decay activities of those fungi in a subtropical natural forest. Among six basidiomycetes and two ascomycetes observed as sporocarps on fallen boles of C. sieboldii, Microporus affinis was most abundantly observed in terms of frequency of sporocarps and as percentage area of decay columns within cross-sections of boles, especially those in the early stages of decomposition. In decay columns of M. affinis, both acidunhydrolyzable residue (AUR) and holocellulose decayed simultaneously, and wood relative density decreased to 45.8% of that of fresh C. sieboldii wood. A pure culture decay test under laboratory conditions showed that M. affinis was a strong decomposer of AUR and holocellulose. These results suggest that M. affinis has a central role in lignocellulose decomposition of wood of C. sieboldii in the early stages of decomposition.

show abstract

Section: Discussionmentioning

confidence: 99%

Fungal decomposition of woody debris of Castanopsis sieboldii in a subtropical old‐growth forest

Fukasawa

Osono

Takeda

2011

Ecological Research

View full text Add to dashboard Cite

show abstract

“…e fungi degrade the cell walls through various ways [6][7][8]. e degradation compromises the structural integrity of the cell walls, negatively affects the mechanical properties of the wood, reduces the life span of the wood in service, and may even cause the wood to fall apart at severe stages of decay.…”

Section: Introductionmentioning

confidence: 99%

The Influence of a Thermal Treatment on the Decay Resistance of Wood via FTIR Analysis

Pan

et al. 2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

e decay resistance of wood can be improved via a vacuum heat treatment. e amount of nutrients from cellulose, hemicellulose, and lignin and amount of sugars needed by the fungi during their growth were investigated. e results showed that the absorbance peaks corresponding to absorbed CH 3 -CH 2 -, C�O, and the benzene ring skeleton stretching vibration all noticeably weakened with increased heat treatment. is indicated that the cellulose, hemicellulose, and lignin degraded to varying degrees. e specimens with a higher initial moisture content (MC) showed greater amounts of nutrient degradation after 2 h at the same heat treatment temperature. e chemical analysis results were in good agreement with the Fourier transform infrared (FTIR) analysis results. e decay resistance tests showed that the average mass loss of the heat-treated specimens was up to 10.8%, in contrast to 22.23% for the untreated specimens. Furthermore, the FTIR analysis of the heat and decay-resistance test showed that the vibration wave peaks that corresponded to CH 3 -CH 2 -at 2954 cm −1 showed noticeably less separation at higher heating temperature. is demonstrated that the cellulose hydrolysis in the wood decreased at higher heating temperatures, which explained why the decay resistance increased with increased heat treatment.

show abstract

“…The best-studied white-rot basidiomycete, Phanerochaete chrysosporium, preferentially degrades lignin under nutrient nitrogen limiting (idiophasic) conditions by secreting enzymes, including lignin and manganese peroxidases (LiP and MnP), and a hydrogen peroxide generating system ( − ). Though specific components of the lignin degrading machinery of various white-rot fungi vary, manganese peroxidases (MnPs) have been detected in virtually all lignin degrading fungi so far studied ( − ).…”

mentioning

confidence: 99%

The Role of Glu39 in Mn^II Binding and Oxidation by Manganese Peroxidase from Phanerochaete chrysoporium

Youngs

Gelpke

et al. 2001

Biochemistry

View full text Add to dashboard Cite

Manganese peroxidase (MnP) is a heme-containing enzyme produced by white-rot fungi and is part of the extracellular lignin degrading system in these organisms. MnP is unique among Mn binding enzymes in its ability to bind and oxidize Mn II and efficiently release Mn III . Initial site-directed mutagenesis studies identified the residues E35, E39, and D179 as the Mn binding ligands. However, an E39D variant was recently reported to display wild-type Mn binding and rate of oxidation, calling into question the role of E39 as an Mn ligand. To investigate this hypothesis, we performed computer modeling studies which indicated metal-ligand bond distances in the E39D variant and in an E35D-E39D-D179E triple variant which might allow Mn binding and oxidation. To test the model, we reconstructed the E35D and E39D variants used in the previous study, as well as an E39A single variant and the E35D-E39D-D179E triple variant of MnP isozyme 1 from Phanerochaete chrysosporium. We find that all of the variant proteins are impaired for Mn II binding (K m increases 20-30-fold) and Mn II oxidation (k cat decreases 50-400-fold) in both the steady state and the transient state. In particular, mutation of the E39 residue in MnP decreases both Mn binding and oxidation. The catalytic efficiency of the E39A variants decreased ∼10 4 -fold, while that of the E39D variant decreased ∼10 3 -fold. Contrary to initial modeling results, the triple variant performed only as well as any of the single Mn ligand variants. Interestingly, the catalytic efficiency of the triple variant decreased only 10 4 -fold, which is ∼10 2 -fold better than that reported for the E35Q-D179N double variant. These combined studies indicate that precise geometry of the Mn ligands within the Mn binding site of MnP is essential for the efficient binding, oxidation, and release of Mn by this enzyme. The results clearly indicate that E39 is a Mn ligand and that mutation of this ligand decreases both Mn binding and the rate of Mn oxidation.

show abstract

Degradation of wood by the basidiomyceteCoriolopsis occidentalis

Cited by 8 publications

References 10 publications

Fungal decomposition of woody debris of Castanopsis sieboldii in a subtropical old‐growth forest

Fungal decomposition of woody debris of Castanopsis sieboldii in a subtropical old‐growth forest

The Influence of a Thermal Treatment on the Decay Resistance of Wood via FTIR Analysis

The Role of Glu39 in Mn^II Binding and Oxidation by Manganese Peroxidase from Phanerochaete chrysoporium

Contact Info

Product

Resources

About

Degradation of wood by the basidiomyceteCoriolopsis occidentalis

Cited by 8 publications

References 10 publications

Fungal decomposition of woody debris of Castanopsis sieboldii in a subtropical old‐growth forest

Fungal decomposition of woody debris of Castanopsis sieboldii in a subtropical old‐growth forest

The Influence of a Thermal Treatment on the Decay Resistance of Wood via FTIR Analysis

The Role of Glu39 in MnII Binding and Oxidation by Manganese Peroxidase from Phanerochaete chrysoporium

Contact Info

Product

Resources

About

The Role of Glu39 in Mn^II Binding and Oxidation by Manganese Peroxidase from Phanerochaete chrysoporium