Regulation of manganese peroxidase gene transcription by hydrogen peroxide, chemical stress, and molecular oxygen

Article Abstract:

Experimental studies reveal that H2O2 and various chemicals regulate the expression of manganese peroxidase (MnP) in nitrogen-limited cultures of Phanerochaete chrysosporium at the level of gene transcription. Northern blot analysis reveals that simultaneous induction by H2O2 and Mn leads to higher production of mnp mRNA compared to that due to induction by H2O2 alone. Heat shock increases the accumulation of mnp mRNA, and accumulation of mnp mRNA due to molecular oxygen is significantly smaller compared to that with H2O2 and heat shock. Simultaneous induction with Mn and H2O2 increases the MnP activity.

Genetic aspects, Oxygen, Genetic regulation, Hydrogen peroxide

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Phanerochaete flavido-alba laccase induction and modification of manganese peroxidase isoenzyme pattern in decolorized olive oil mill wastewaters

Article Abstract:

Ligninolytic enzymes were purified from the extracellular fluids of Phanerochaete flavido-alba-decolorized cultures containing olive oil mill wastewater (OMW). Lignin peroxidase, manganese-dependent peroxidase (MnP) and laccase were the enzymes isolated. Purification steps and enzymatic assays performed show that MnP is the dominant enzyme. However, laccase induction was noted in the supernatant solutions. These results indicate that the production of ligninolytic enzymes by P. flavido-alba is influenced heavily by OMW.

Peroxidase, Sludge, Isoenzymes

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Roles of lignin peroxidase and manganese peroxidase from Phanerochaete chrysosporium in the decolorization of olive mill wastewaters

Article Abstract:

Analysis of the influence of lignin peroxidase (LiP) and manganese peroxidase (MnP) activities on the decolorization of olive mill wastewaters (OMW) by Phanerochaete chrysosporium reveals that LiP contributes more to OMW decolorization. A combination of low initial oxygen demands and high levels of extracellular LiP leads to the highest OMW decolorization. Addition of veratryl alcohol increases the LiP activity and OMW decolorization.

Environmental aspects, Biodegradation, Waste disposal in the ground, Underground waste disposal, Mills and mill-work, Mills

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