title: Heterologous expression of Trametes versicolor laccase in Pichia pastoris and Aspergillus niger.
abstract: Convenient expression systems for efficient heterologous production of different laccases are needed for their characterization and application. The laccase cDNAs lcc1 and lcc2 from Trametes versicolor were expressed in Pichia pastoris and Aspergillus niger under control of their respective glyceraldehyde-3-phosphate dehydrogenase promoters and with the native secretion signal directing catalytically active laccase to the medium. P. pastoris batch cultures in shake-flasks gave higher volumetric activity (1.3 U/L) and a better activity to biomass ratio with glucose than with glycerol or maltose as carbon source. Preliminary experiments with fed-batch cultures of P. pastoris in bioreactors yielded higher activity (2.8 U/L) than the shake-flask experiments, although the levels remained moderate and useful primarily for screening purposes. With A. niger, high levels of laccase (2700 U/L) were produced using a minimal medium containing sucrose and yeast extract. Recombinant laccase from A. niger harboring the lcc2 cDNA was purified to homogeneity and it was found to be a 70-kDa homogeneous enzyme with biochemical and catalytic properties similar to those of native T. versicolor laccase A.
authors.affiliation: Biochemistry, Division for Chemistry, Karlstad University, SE-651 88 Karlstad, Sweden.
authors.forename: Christina
authors.initials: C
authors.lastname: Bohlin
authors.forename: Leif J
authors.initials: LJ
authors.lastname: Jönsson
authors.forename: Robyn
authors.initials: R
authors.lastname: Roth
authors.forename: Willem H
authors.initials: WH
authors.lastname: van Zyl
mesh_terms: D001234:Aspergillus niger / Q000201:enzymology* / Q000235:genetics; D001487:Basidiomycota / Q000201:enzymology* / Q000235:genetics; D004789:Enzyme Activation; D004795:Enzyme Stability; D015870:Gene Expression / Q000502:physiology; D024861:Genetic Enhancement / Q000379:methods; D042845:Laccase / Q000032:analysis / Q000096:biosynthesis* / Q000737:chemistry*; D008970:Molecular Weight; D010843:Pichia / Q000201:enzymology* / Q000235:genetics; D015202:Protein Engineering / Q000379:methods*; D011994:Recombinant Proteins / Q000378:metabolism; D013045:Species Specificity; D013395:Sucrose / Q000378:metabolism
chemical_list: D011994:Recombinant Proteins; D013395:Sucrose; D042845:Laccase