Molecular Cloning and Expression of a Laccase from Ganoderma lucidum, and Its Antioxidative Properties

  • Joo, Seong Soo (Research Institute of Veterinary Medicine, Chungbuk National University) ;
  • Ryu, In Wang (Division and Institute of Life Sciences, Kangwon National University) ;
  • Park, Ji-Kook (Division and Institute of Life Sciences, Kangwon National University) ;
  • Yoo, Yeong Min (Institute of Korea Medicine, College of Korea Medicine, Sangji University) ;
  • Lee, Dong-Hyun (Division and Institute of Life Sciences, Kangwon National University) ;
  • Hwang, Kwang Woo (Department of Immunology, College of Pharmacy, Chung-Ang University) ;
  • Choi, Hyoung-Tae (Division and Institute of Life Sciences, Kangwon National University) ;
  • Lim, Chang-Jin (Division and Institute of Life Sciences, Kangwon National University) ;
  • Lee, Do Ik (Department of Immunology, College of Pharmacy, Chung-Ang University) ;
  • Kim, Kyunghoon (Division and Institute of Life Sciences, Kangwon National University)
  • Received : 2007.08.03
  • Accepted : 2007.09.06
  • Published : 2008.02.29

Abstract

Laccases are multicopper-containing oxidases that catalyze the oxidation of many aromatic compounds with concomitant reduction of oxygen to water. Interest in this enzyme has arisen in many fields of industry, including detoxification, wine stabilization, paper processing, and enzymatic conversion of chemical intermediates. In this study, we cloned a laccase gene (GLlac1) from the white-rot fungus Ganoderma lucidum. The cloned gene consists of 4,357 bp, with its coding region interrupted by nine introns, and the upstream region has putative CAAT and TATA boxes as well as several metal responsive elements (MREs). We also cloned a full-length cDNA of GLlac1, which contains an uninterrupted open reading frame (ORF) of 1,560 bp coding for 520 amino acids with a putative 21-residue signal sequence. The DNA and deduced amino acid sequences of GLlac1 were similar but not identical to those of other fungal laccases. GLlac1 was released from the cells when expressed in P. pastoris, and had high laccase activity. In addition, GLlac1 conferred antioxidative protection from protein degradation, and thus may be useful in bio-medical applications.

Keywords

Blue-Copper Protein;G. lucidum;Gene Cloning;Inverse PCR;Laccase;P. pastoris

Acknowledgement

Supported by : Korea Research Foundation

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