Production, purification and biochemical characterization of two laccase isoforms produced by Trametes versicolor grown on oak sawdust
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Two laccase isoforms (lcc1 and lcc2) produced by Trametes versicolor, grown on oak sawdust under solid-state fermentation conditions, were purified and characterized. The two isoforms showed significant biochemical differences. Lcc1 and lcc2 had MWs of 60 and 100 kDa, respectively. Both isoforms had maximal activity at pH 3 with ABTS and 2,6-dimethyloxyphenol (DMP). Lcc1 was the most attractive isoform due to its greater affinity towards all the laccase substrates used. Lcc1 had Km values of 12, 10, 15 and 17 mM towards ABTS, DMP, guaiacol and syringaldazine, respectively. Lcc2 had equivalent values of 45, 47, 15 and 39 mM. The biochemical properties of lcc1 substantiate the potential of this enzyme for application in the treatment of contaminated water with low pH values and high phenolic content.
KeywordsLaccase characterization Laccase isoforms Laccase purification Lignolytic enzymes Solid-state fermentation
BB and AAPN acknowledge the fellowship of the PROMEP project 103.5/07/2674. We are grateful to M.A. Francisco Abel Medrano-Vega from Laboratorio de Micología at Centro de Investigaciones Biológicas, UAEM for the SSF cultures of T. versicolor used in this work. We are also grateful to M. B. Daniel Morales Guzmán for his excellent technical assistance.
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