title: A His-tagged Melanocarpus albomyces laccase and its electrochemistry upon immobilisation on NTA-modified electrodes and in conducting polymer films.
abstract: The article describes the construction, immobilisation and electrochemistry of histidine tagged laccase from Melanocarpus albomyces. A facile method of functionalisation of glassy carbon electrodes with nitrilotriacetic acid (NTA) using diazonium grafting and solid state chemistry is described. NTA-modified electrodes are shown to bind laccase which reduces oxygen at neutral pH in the presence of soluble redox mediator. Laccase-modified electrodes are also prepared by enzyme immobilisation within poly(aniline)/poly(vinylsulfonate) films. The polymer is found to efficiently retain the enzyme as well as provide direct electrical contact between the electrode and the enzyme active centre. Cyclic voltammetry reveals the direct electron transfer to the enzyme is dependent on the redox state of the polymer film.
authors.affiliation: Chemistry, University of Southampton, Highfield, SO17 1BJ, Southampton, UK.
authors.forename: Maciej
authors.initials: M
authors.lastname: Sosna
authors.forename: Harry
authors.initials: H
authors.lastname: Boer
authors.forename: Philip N
authors.initials: PN
authors.lastname: Bartlett
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry / Q000378:metabolism; D001203:Ascomycota / Q000201:enzymology*; D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D003979:Diazonium Compounds / Q000737:chemistry / Q000378:metabolism; D004553:Electric Conductivity; D055664:Electrochemical Techniques; D004566:Electrodes; D006639:Histidine / Q000737:chemistry / Q000378:metabolism*; D042845:Laccase / Q000737:chemistry / Q000378:metabolism*; D009571:Nitrilotriacetic Acid / Q000737:chemistry / Q000378:metabolism*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D011145:Polyvinyls / Q000737:chemistry / Q000378:metabolism; D013499:Surface Properties
chemical_list: D000814:Aniline Compounds; D003979:Diazonium Compounds; D011145:Polyvinyls; C416807:polyaniline; D006639:Histidine; D002244:Carbon; D042845:Laccase; D009571:Nitrilotriacetic Acid; D010100:Oxygen
keywords: biofuel cells; direct electron transfer; laccase; modified electrodes; polyaniline