Oxalate-Dependent Reductive Activity of Manganese Peroxidase from Phanerochaete chrysosporium

Khindaria, Aditya; Grover, Thomas A.; Aust, Steven D.

doi:10.1006/abbi.1994.1446

Cited by 67 publications

(44 citation statements)

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“…Oxidative reactions by manganese peroxidase which is produced by white rot fungi are enhanced by chelation of manganese ions by oxalate, providing greater solubility and oxidative action at a distance from the enzyme (Wariishi et al 1992;Kuan and Tien 1993;Kishi et al 1994;Sutherland et al 1995;Timofeevski and Aust 1997;Zapanta and Tien 1997). Oxidative actions involving oxalate can produce free radicals (Khindaria et al 1994), which might result in oxalate attachment. Experimental studies by several workers on biopulping indicated that OA might be suitable for pretreatment of wood chips Swaney et al 2003).…”

Section: Changes In Wood Properties Due To Biopulpingmentioning

confidence: 99%

Biopulping of lignocellulosic material using different fungal species: a review

Singh

Sulaiman

Hashim

et al. 2010

Rev Environ Sci Biotechnol

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Biopulping can be an alternative to the traditional methods of pulping. Biopulping use fungi that are known to be able to degrade wood as well as lignin constituent of wood. Amongst these white rot fungi are the most proficient biodegrader. The fungus is non sporulating and is a selective lignin degrader. It colonizes either on living or dead wood and decomposes all wood polymers including lignin and extractives making it to be extremely potential to be used in biopulping. The process of biopulping reduces the utilization of chemical in pulping industry and help in decreasing the environmental hazard caused by normal pulping. The present review deals with diverse aspects of biopulping and their ecological as well as economic significances.

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Section: Changes In Wood Properties Due To Biopulpingmentioning

confidence: 99%

Biopulping of lignocellulosic material using different fungal species: a review

Singh

Sulaiman

Hashim

et al. 2010

Rev Environ Sci Biotechnol

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“…Phenoloxidase activities, namely laccase [6], manganese peroxidase [22], and lignin peroxidase [40], were also evaluated. As with enzymatic activities, the protein contents in the enzymatic preparations were determined following a standard procedure [13].…”

Section: Commercial Cellulolytic Preparationsmentioning

confidence: 99%

Characterization of commercial cellulases and their use in the saccharification of a sugarcane bagasse sample pretreated with dilute sulfuric acid

Santos

Esteves

Milagres

et al. 2010

J Ind Microbiol Biotechnol

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This study aimed to correlate the efficiency of enzymatic hydrolysis of the cellulose contained in a sugarcane bagasse sample pretreated with dilute H(2)SO(4) with the levels of independent variables such as initial content of solids and loadings of enzymes and surfactant (Tween 20), for two cellulolytic commercial preparations. The preparations, designated cellulase I and cellulase II, were characterized regarding the activities of total cellulases, endoglucanase, cellobiohydrolase, cellobiase, β-glucosidase, xylanase, and phenoloxidases (laccase, manganese and lignin peroxidases), as well as protein contents. Both extracts showed complete cellulolytic complexes and considerable activities of xylanases, without activities of phenoloxidases. For the enzymatic hydrolyses, two 2(3) central composite full factorial designs were employed to evaluate the effects caused by the initial content of solids (1.19-4.81%, w/w) and loadings of enzymes (1.9-38.1 FPU/g bagasse) and Tween 20 (0.0-0.1 g/g bagasse) on the cellulose digestibility. Within 24 h of enzymatic hydrolysis, all three independent variables influenced the conversion of cellulose by cellulase I. Using cellulase II, only enzyme and surfactant loadings showed significant effects on cellulose conversion. An additional experiment demonstrated the possibility of increasing the initial content of solids to values much higher than 4.81% (w/w) without compromising the efficiency of cellulose conversion, consequently improving the glucose concentration in the hydrolysate.

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“…Mn(III) is stripped from the enzyme by organic acids, and the formed Mn(III)-organic acid complex acts as a diffusible mediator in the oxidation of lignin by MnP (6,9). Mn(III) can also oxidize organic acids, yielding radicals (11). There are two possible sources of organic acids during lignin degradation.…”

mentioning

confidence: 99%