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H2O2-dependent decolorization of Poly R-481 by particulate fractions from Phanerochaete chrysosporium
Abstract:
A cell-free preparation from Phanerochaete chrysosporium culture medium decolorized the polymeric dye Poly R-481. The majority of this decolorization activity sedimented when centrifuged at 150,000 X g, indicating that it was associated with a particulate body. The activity was sensitive to heat, azide and cyanide, was stimulated by exogenously added H2O2, and was optimal around pH 4. Electron micrographs of the sedimented culture medium fraction showed the presence of numerous particulate structures. A similar dye decolorization activity from sonicated mycelium also sedimented at 150,000 X g.
Insights
Phanerochaete chrysosporium enzymes in culture medium effectively decolorize Poly R-481 dye. This dye decolorization activity is linked to particulate structures and influenced by environmental factors.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Bioremediation
Background:
- Polymeric dyes like Poly R-481 pose environmental challenges.
- Microbial decolorization offers a sustainable solution for dye waste treatment.
Purpose of the Study:
- To investigate the cell-free decolorization of Poly R-481 by Phanerochaete chrysosporium.
- To characterize the nature and localization of the dye-decolorizing activity.
Main Methods:
- Utilized cell-free preparations from Phanerochaete chrysosporium culture medium.
- Employed ultracentrifugation (150,000 x g) to isolate active components.
- Assessed activity sensitivity to heat, inhibitors (azide, cyanide), H2O2, and pH.
- Analyzed sedimented fractions using electron microscopy.
Main Results:
- Cell-free preparations demonstrated significant Poly R-481 decolorization.
- The activity was primarily associated with particulate matter sedimenting at 150,000 x g.
- Decolorization was inhibited by heat, azide, and cyanide, but stimulated by H2O2.
- Optimal activity occurred around pH 4.
- Electron microscopy confirmed the presence of particulate structures in the active fraction.
- Similar activity was observed in sonicated mycelium, also associated with particulate fractions.
Conclusions:
- Phanerochaete chrysosporium possesses extracellular, particulate-bound enzymes responsible for Poly R-481 decolorization.
- These enzymes exhibit characteristics of oxidative enzymes, likely involving peroxidases.
- The findings support the potential of P. chrysosporium for bioremediation of dye-containing wastewater.