isopropyl-thiogalactoside and syringaldazine

We obtained structural and functional characterization of a recombinant Laccase from Rigidoporus lignosus (formerly Rigidoporus microporus), a white-rot basidiomycete, by means of circular dichroism (CD) spectra, cyclic voltammetry (CV) and biochemical assays. Here we report the optimization of expression and purification procedures of a recombinant Laccase expressed in supercompetent Escherichia coli cells. We amplified the coding sequence of Laccase using PCR from cDNA and cloned into a bacterial expression system. The resulting expression plasmid, pET-28b, was under a strong T7/Lac promoter induced by IPTG (isopropyl-β-d-thiogalactoipyranoside). We obtained purification by fast protein liquid chromatography (FPLC) method. We recorded the variation of the current of a solution containing purified Laccase with increasing Syringaldazine (SGZ) concentration using a potentiometer as proof of principle, showing its compatibility with the development of a new enzymatic biosensor for medical purposes, as described in Part II.

Topics: Amino Acid Sequence; Chromatography, Liquid; Circular Dichroism; Cloning, Molecular; Coriolaceae; Enzyme Assays; Escherichia coli; Gene Amplification; Hydrazones; Isopropyl Thiogalactoside; Lac Operon; Laccase; Molecular Sequence Data; Plasmids; Promoter Regions, Genetic; Recombinant Proteins