title: Production, purification and biochemical characterization of two laccase isoforms produced by Trametes versicolor grown on oak sawdust.
abstract: 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.
authors.affiliation: Laboratorio de Biotecnología Ambiental, Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, CP 62209, Cuernavaca, Morelos, Mexico.
authors.forename: Fernando
authors.initials: F
authors.lastname: Martínez-Morales
authors.forename: Brandt
authors.initials: B
authors.lastname: Bertrand
authors.forename: Angélica A
authors.initials: AA
authors.lastname: Pasión Nava
authors.forename: Raunel
authors.initials: R
authors.lastname: Tinoco
authors.forename: Lourdes
authors.initials: L
authors.lastname: Acosta-Urdapilleta
authors.forename: María R
authors.initials: MR
authors.lastname: Trejo-Hernández
mesh_terms: D005656:Fungal Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D042845:Laccase / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D008031:Lignin / Q000378:metabolism; D020033:Protein Isoforms; D029963:Quercus; D055454:Trametes / Q000201:enzymology* / Q000378:metabolism
chemical_list: D005656:Fungal Proteins; D020033:Protein Isoforms; C036909:lignocellulose; D008031:Lignin; D042845:Laccase