PMID: 8598061Mar 1, 1996Paper

The identification and characterization of four laccases from the plant pathogenic fungus Rhizoctonia solani

Current Genetics
J A WahleithnerP Schneider

Abstract

Four distinct laccase genes, lcc1, lcc2, lcc3 and lcc4, have been identified in the fungus Rhizoctonia solani. Both cDNA and genomic copies of these genes were isolated and characterized. Hybridization analyses indicate that each of the four laccase genes is present in a single copy in the genome. The R. solani laccases can be divided into two groups based on their protein size, intron/exon organization, and transcriptional regulation. Three of these enzymes have been expressed in the fungus Aspergillus oryzae. Two of the recombinant laccases, r-lcc1 and r-lcc4, as well as the native lcc4 enzyme were purified and characterized. The purified proteins are homodimeric, comprised of two subunits of approximately 66kDa for lcc4 and 50-100kDa for the recombinant lcc1 protein. These laccases have spectral properties that are consistent with other blue copper proteins. With syringaldazine as a substrate, lcc4 has optimal activity at pH7, whereas lcc1 has optimal activity at pH6.

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Citations

Apr 13, 2007·Applied Microbiology and Biotechnology·Paola GiardinaGiovanni Sannia
Nov 29, 2007·Applied Microbiology and Biotechnology·Vincenza FaracoGiovanni Sannia
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