title: Increasing Pleurotus ostreatus laccase production by culture medium optimization and copper/lignin synergistic induction.
abstract: Laccases have great biotechnological potential in diverse industries as they catalyze the oxidation of a broad variety of chemical compounds. Production of laccases by basidiomycetes has been broadly studied as they secrete the enzymes, grow on cheap substrates, and they generally produce more than one isoenzyme (constitutive and/or inducible). Laccase production and isoenzyme profile can be modified through medium composition and the use of inducers. The objective of this work was to increase laccase production by Pleurotus ostreatus CP-50 through culture medium optimization and the simultaneous use of copper and lignin as inducers. Increased fungal growth was obtained through the use of a factorial fractional experimental design 2⁶⁻² where the influence of the nature and concentration of carbon and nitrogen sources was assessed. Although specific laccase production (U/mg biomass) decreased when malt extract medium was supplemented with carbon and nitrogen sources, fungal growth and laccase volumetric activity increased four and sixfold, respectively. The effect of media supplementation with copper and/or lignin on laccase production by P. ostreatus CP-50 was studied. A positive synergistic effect between copper and lignin was observed on laccase production. Overall, the use of an optimized medium and the simultaneous addition of copper and lignin improved growth, laccase volumetric activity, and process productivity by 4-, 60-, and 10-fold, respectively.
authors.affiliation: Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Col. Chamilpa, Cuernavaca 62250, Morelos, Mexico. raunel@ibt.unam.mx
authors.forename: Raunel
authors.initials: R
authors.lastname: Tinoco
authors.forename: Abisaí
authors.initials: A
authors.lastname: Acevedo
authors.forename: Enrique
authors.initials: E
authors.lastname: Galindo
authors.forename: Leobardo
authors.initials: L
authors.lastname: Serrano-Carreón
mesh_terms: D002244:Carbon / Q000494:pharmacology; D003300:Copper / Q000494:pharmacology*; D003470:Culture Media / Q000737:chemistry; D004357:Drug Synergism; D042845:Laccase / Q000096:biosynthesis*; D008031:Lignin / Q000494:pharmacology*; D009584:Nitrogen / Q000494:pharmacology; D020076:Pleurotus / Q000187:drug effects / Q000201:enzymology* / Q000254:growth & development
chemical_list: D003470:Culture Media; D002244:Carbon; D003300:Copper; D008031:Lignin; D042845:Laccase; D009584:Nitrogen