Purification of Major Lignin Peroxidase Isoenzymes from Phanerochaete chrysosporium by Chromatofocusing

Abstract

The basidiomycete Phanerochaete chrysosporium produces several isoforms of lignin peroxidase, which catalyzes the oxidative depolymerization of lignin. To date, ion-exchange chromatography and preparative isoelectric focusing (IEF) have been commonly used for isolation of lignin peroxidase isoenzymes. In this work we have purified major lignin peroxidases to high purity by a one-step chromatographic method, chromatofocusing. The purified isoenzymes were identified by analytical IEF using isoenzymes purified by preparative IEF as standards. The specific activities and spectral properties of the isoenzymes were comparable with the previously published data. The predominant isoenzyme under the growth conditions used was LiP 4.65. Almost 50% of the lignin peroxidase activity applied into the column was recovered in the LiP 4.65 fraction. The total recovery of the lignin peroxidase activity was over 80%.