title: Purification and characterization of a recombinant laccase-like multi-copper oxidase from Paenibacillus glucanolyticus SLM1.
abstract: OBJECTIVE
  The aim of this study was to evaluate the activity of a novel bacterial laccase-like multi-copper oxidase (LMCO) from Paenibacillus glucanolyticus SLM1: a bacterium isolated from pulp and paper waste.
  
  
  RESULTS
  A new bacterial LMCO gene (CuOx) from P. glucanolyticus SLM1 was identified and cloned into pET22b. The protein it encodes was recombinantly expressed in Escherichia coli. The recombinant P. glucanolyticus LMCO had a molecular weight of approximately 90 kDa and demonstrated oxidation of the LMCO substrates 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS), catechol, and 2,6-Dimethoxyphenol (2,6-DMP), with the oxidation of ABTS occurring to the greatest extent (776 U mg-1under optimal conditions of pH 7 and 40°C). Furthermore, recombinant P. glucanolyticus CuOx retained activity against ABTS in the presence of 1 mol l-1NaCl, 50% dimethyl sulfoxide and 5% Tween-80 and can decolorize several types of dyes.
  
  
  CONCLUSIONS
  This enzyme has a neutral pH optimum, is capable of decolorizing dyes, and is active in the presence salt, detergents and surfactant. The characteristics of this enzyme suggest that it could be used for a variety of industrial applications.
  
  
  CONCLUSIONS
  This work characterizes a unique bacterial LMCO with activity higher than that of previously characterized fungal or bacterial LMCOs. This enzyme may have utility for industrial bleaching, treatment of dye effluent, and lignin removal.
authors.affiliation: Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, USA.|Department of Biology, Campbell University, Buies Creek, NC, USA.
authors.forename: S L
authors.initials: SL
authors.lastname: Mathews
authors.affiliation: Department of Biochemistry, Texas A&M University, College Station, TX, USA.
authors.forename: C E
authors.initials: CE
authors.lastname: Smithson
authors.affiliation: Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, USA. amy_grunden@ncsu.edu.
authors.forename: A M
authors.initials: AM
authors.lastname: Grunden
mesh_terms: D052160:Benzothiazoles / Q000378:metabolism; D002396:Catechols / Q000378:metabolism; D004396:Coloring Agents / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D010088:Oxidoreductases / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D056507:Paenibacillus / Q000201:enzymology*; D011748:Pyrogallol / Q000031:analogs & derivatives / Q000378:metabolism; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D013451:Sulfonic Acids / Q000378:metabolism
chemical_list: D052160:Benzothiazoles; D002396:Catechols; D004396:Coloring Agents; D011994:Recombinant Proteins; D013451:Sulfonic Acids; D011748:Pyrogallol; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; C010120:pyrogallol 1,3-dimethyl ether; D010088:Oxidoreductases; C024748:copper oxidase; C034221:catechol
keywords: Paenibacillus glucanolyticus SLM1; dye decolorization; laccase; lignin degradation; recombinant expression