Role of organic acid chelators in manganese regulation of lignin degradation byPhanerochaete chrysosporium

Perez, J.; Jeffries, Thomas W.

doi:10.1007/bf02918992

Cited by 58 publications

(57 citation statements)

References 25 publications

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“…Culture studies with lignindecomposing fungi showed that trivalent Mn 3+ is generated during the oxidation of lignin model compounds (17). It has been proposed that Mn 3+ is formed via the oxidation of soluble Mn 2+ by fungal exo-enzymes, such as Mn peroxidase or phenol oxidases (e.g., laccase).…”

mentioning

confidence: 99%

Long-term litter decomposition controlled by manganese redox cycling

Keiluweit

Nico

Harmon

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

188

156

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Litter decomposition is a keystone ecosystem process impacting nutrient cycling and productivity, soil properties, and the terrestrial carbon (C) balance, but the factors regulating decomposition rate are still poorly understood. Traditional models assume that the rate is controlled by litter quality, relying on parameters such as lignin content as predictors. However, a strong correlation has been observed between the manganese (Mn) content of litter and decomposition rates across a variety of forest ecosystems. Here, we show that long-term litter decomposition in forest ecosystems is tightly coupled to Mn redox cycling. Over 7 years of litter decomposition, microbial transformation of litter was paralleled by variations in Mn oxidation state and concentration. A detailed chemical imaging analysis of the litter revealed that fungi recruit and redistribute unreactive Mn 2+ provided by fresh plant litter to produce oxidative Mn 3+ species at sites of active decay, with Mn eventually accumulating as insoluble Mn 3+/4+ oxides. Formation of reactive Mn 3+ species coincided with the generation of aromatic oxidation products, providing direct proof of the previously posited role of Mn 3+ -based oxidizers in the breakdown of litter. Our results suggest that the litter-decomposing machinery at our coniferous forest site depends on the ability of plants and microbes to supply, accumulate, and regenerate short-lived Mn 3+ species in the litter layer. This observation indicates that biogeochemical constraints on bioavailability, mobility, and reactivity of Mn in the plant-soil system may have a profound impact on litter decomposition rates.terrestrial carbon cycle | nutrient cycling | forest soil ecosystems | soil-atmosphere interactions | climate change D ecomposition of above-ground plant detritus (litter) is a fundamental process regulating the release of nutrients for plant growth and the formation of soil organic matter (SOM) in forest ecosystems (1). Litter decomposition regulates the proportion of litter-derived carbon (C) that is either retained in the system as SOM or lost as CO 2 (2), thereby influencing net C storage in soils. Although even small decomposition rate increases may accelerate climate change by virtue of increasing CO 2 emissions from soils (3), uncertainty persists over the ratecontrolling mechanisms (4, 5).Litter decomposition rates are strongly influenced by climatic factors (e.g., temperature and moisture) and have long been linked to litter chemistry, specifically lignin content (6). Ligninan aromatic biopolymer-often makes up between 15% and 40% of the litter mass and is concentrated in cell walls (7). It encrusts cellulose microfibrils to form protective physical units ("ligno-cellulose complexes") that are embedded in a matrix of hemicellulose. Conventional thinking suggests that the relatively high initial litter decomposition rates are due to the preferential use of soluble and readily accessible polysaccharides and hemicelluloses relative to lignin components. In later stages, decompositi...

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mentioning

confidence: 99%

Long-term litter decomposition controlled by manganese redox cycling

Keiluweit

Nico

Harmon

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

188

156

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“…Therefore, it is possible that manganese also regulates the overall mineralisation of target compounds like persistent recalcitrant chemicals and in this case, Aroclor (Bonnarme and Jeffries, 1990). Perez and Jeffries (1992) and Kern (1989Kern ( , 1990, also found that Mn(II) induced MnP and that simultaneous repression of LiP was due to the presence of soluble complexes of simple organic acids. The higher concentrations of Mn ions, provided by solid Mn0 2 , indicated a higher production of MnP in our study for all trials, excepting the culture containing 57.5 mM Mn0 2 .…”

Section: Aroclor Biodegradationmentioning

confidence: 83%

Removal of Aroclor 1254 by the white rot fungus Coriolus versicolor in the presence of different concentrations of Mn(IV)oxide

Cloete

Celliers

1999

International Biodeterioration & Biodegradation

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“…Although additions of Mn# + might be expected to accelerate the decoloration of dyes, the presence of 0n2 m Mn# + in HRP solution and soybean root extract inhibited the enzymic reactions of plant peroxidase. Inhibition by Mn# + has also been reported for the lignin peroxidase of Phanerochaete chrysosporium Burdsall (Perez & Jeffries, 1992). The nature of this inhibitory effect on certain peroxidases is unknown.…”

Section: mentioning

confidence: 92%

Activities of oxidoreductase enzymes in tissue extracts and sterile root exudates of three crop plants, and some properties of the peroxidase component

Gramss

Rudeschko

1998

New Phytologist

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Aqueous extracts of homogenized shoot and root tissue of alfalfa (Medicago sativa L.), white mustard (Sinapis alba L.), and cress (Lepidium sativum L.), with the exudates of sterile roots of these crop plants, were examined spectrophotometrically for the activities of 20 oxidoreductase enzymes by standard procedures. In tissue extracts and root exudates, the reactions of laccase (EC 1;10;3;2), ascorbate oxidase (EC 1;10;3;3), monophenol monooxygenase (EC 1;14;18;1), and phenol 2-monooxygenase (EC 1;14;13;7) were readily detected. Of the aromatic-ring cleavage dioxygenases, those of the meta-cleavage pathway (EC 1;13;11;2 and 1;13;11;8) could also be detected. Guaiacol peroxidase (EC 1;11;1;7) was dominant in all samples. In sterile root exudates of alfalfa, this enzyme was represented by at least seven acidic isoforms. The formation of the ligninolytic Mn$ + \malonate and Mn$ + \citrate complexes from Mn# + occurred in all tissue extracts and in root exudates of alfalfa. In root extracts of soybean (Glycine max L.), the rate of Mn$ + generation correlated (P l 0n993) with the activities of endogenous plant guaiacol peroxidase and horseradish peroxidase (HRP) supplements and also with the total phenol content in tissue extracts (P l 0n984). Plant guaiacol peroxidase and purified HRP decolorized four aromatic dyes, an activity reported to be involved in ligninolysis. Although no enzymes capable of generating H # O # as a consequence of the oxidation of simple sugars, amino acids, organic acids, and aldehydes were found, traces of peroxide were detected in tissue extracts and in the root exudate of alfalfa. It is concluded that the oxidoreductases found in plant tissues also occur in root exudates of aseptic whole plants. The significance of interrelations between oxidoreductase enzymes and enzymically generated higher-valency metal ions is discussed in the context of the oxidative conversion of phenolic compounds in soil and plant tissue.

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Role of organic acid chelators in manganese regulation of lignin degradation byPhanerochaete chrysosporium

Cited by 58 publications

References 25 publications

Long-term litter decomposition controlled by manganese redox cycling

Long-term litter decomposition controlled by manganese redox cycling

Removal of Aroclor 1254 by the white rot fungus Coriolus versicolor in the presence of different concentrations of Mn(IV)oxide

Activities of oxidoreductase enzymes in tissue extracts and sterile root exudates of three crop plants, and some properties of the peroxidase component

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