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. 1991 Aug;57(8):2368–2375. doi: 10.1128/aem.57.8.2368-2375.1991

Role of manganese peroxidases and lignin peroxidases of Phanerochaete chrysosporium in the decolorization of kraft bleach plant effluent.

F C Michel Jr 1, S B Dass 1, E A Grulke 1, C A Reddy 1
PMCID: PMC183577  PMID: 1768105

Abstract

The role of lignin peroxidases (LIPs) and manganese peroxidases (MNPs) of Phanerochaete chrysosporium in decolorizing kraft bleach plant effluent (BPE) was investigated. Negligible BPE decolorization was exhibited by a per mutant, which lacks the ability to produce both the LIPs and the MNPs. Also, little decolorization was seen when the wild type was grown in high-nitrogen medium, in which the production of LIPs and MNPs is blocked. A lip mutant of P. chrysosporium, which produces MNPs but not LIPs, showed about 80% of the activity exhibited by the wild type, indicating that the MNPs play an important role in BPE decolorization. When P. chrysosporium was grown in a medium with 100 ppm of Mn(II), high levels of MNPs but no LIPs were produced, and this culture also exhibited high rates of BPE decolorization, lending further support to the idea that MNPs play a key role in BPE decolorization. When P. chrysosporium was grown in a medium with no Mn(II), high levels of LIPs but negligible levels of MNPs were produced and the rate and extent of BPE decolorization by such cultures were quite low, indicating that LIPs play a relatively minor role in BPE decolorization. Furthermore, high rates of BPE decolorization were seen on days 3 and 4 of incubation, when the cultures exhibit high levels of MNP activity but little or no LIP activity. These results indicate that MNPs play a relatively more important role than LIPs in BPE decolorization by P. chrysosporium.

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Selected References

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