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. 1997 May;63(5):1744–1748. doi: 10.1128/aem.63.5.1744-1748.1997

Production and Purification of Remazol Brilliant Blue R Decolorizing Peroxidase from the Culture Filtrate of Pleurotus ostreatus

K Shin, I Oh, C Kim
PMCID: PMC1389145  PMID: 16535590

Abstract

An extracellular H(inf2)O(inf2)-requiring Remazol brilliant blue R (RBBR) decolorizing enzymatic activity was found in the culture medium of Pleurotus ostreatus. The enzymatic activity was maximally obtained in idiophase, and the optimum C/N ratio was 24. High C/N ratios repressed the enzymatic activity, and addition of veratryl alcohol had no effect on the production of enzyme. The enzyme was purified by ammonium sulfate fractionation, Sephacryl S-200 HR chromatography, DEAE Sepharose CL-6B chromatography, and Mono Q chromatography. The purification of RBBR decolorizing peroxidase, as judged by the final specific activity of 6.00 U/mg, was 54.5-fold, with a yield of 9.9%. The molecular mass of the native enzyme determined by gel permeation chromatography was found to be about 73 kDa. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that the enzyme was a monomer with a molecular mass of 71 kDa. The enzyme was optimally active at pH 3.0 to 3.5 and at 25(deg)C. Under standard assay conditions, the apparent K(infm) values of the enzyme toward RBBR and H(inf2)O(inf2) were 10.99 and 32.97 (mu)M, respectively. The enzyme had affinity toward various phenolic compounds and artificial dyes, and it was inhibited by Na(inf2)S(inf2)O(inf5), potassium cyanide, NaN(inf3), and cysteine. The absorption spectrum of the enzyme exhibited maxima at 407, 510, and 640 nm. The addition of H(inf2)O(inf2) to the enzyme resulted in an absorbance decrease at 407 and 510 nm.

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Selected References

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