10. Lignin-Degrading Enzymes: An Overview

  1. Shang-Tian Yang1,
  2. Hesham A El-Enshasy2 and
  3. Nuttha Thongchul3
  1. Rajni Hatti-Kaul and
  2. Victor Ibrahim

Published Online: 12 JUL 2013

DOI: 10.1002/9781118642047.ch10

Bioprocessing Technologies in Biorefinery for Sustainable Production of Fuels, Chemicals, and Polymers

Bioprocessing Technologies in Biorefinery for Sustainable Production of Fuels, Chemicals, and Polymers

How to Cite

Hatti-Kaul, R. and Ibrahim, V. (2013) Lignin-Degrading Enzymes: An Overview, in Bioprocessing Technologies in Biorefinery for Sustainable Production of Fuels, Chemicals, and Polymers (eds S.-T. Yang, H. A. El-Enshasy and N. Thongchul), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9781118642047.ch10

Editor Information

  1. 1

    William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA

  2. 2

    Institute of Bioproduct Development (IBD), Universiti Teknologi Malaysia (UTM), Johor Bahru, Johor, Malaysia

  3. 3

    Institute of Biotechnology and Genetic Engineering, Chulalongkorn University, Bangkok, Thailand

Publication History

  1. Published Online: 12 JUL 2013

ISBN Information

Print ISBN: 9780470541951

Online ISBN: 9781118642047

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Keywords:

  • laccases;
  • lignin modifying enzymes (LMEs);
  • lignin-degrading auxiliary (LDA) enzymes;
  • ligninolytic enzymes;
  • ligninolytic peroxidases

Summary

Lignin is the second most abundant naturally produced organic polymer on earth. Lignin-modifying enzymes (LMEs) are produced by the white-rot fungi as products of secondary metabolism, since lignin degradation does not provide any energy to the fungus. The main oxidative enzymes include the peroxidases-lignin peroxidase (LiP) (diarylpropane: oxygen, hydrogen peroxide oxidoreductase), manganese peroxidase (MnP) (Mn(II): hydrogen peroxide oxidoreductase) and versatile peroxidase (VP), and laccase (benzenediol: oxygen oxidoreductase). Additional oxidative enzymes named lignin-degrading auxiliary (LDA) enzymes act in concert with the main degrading enzymes facilitating lignin degradation. Laccases belong to the so-called blue-copper family of oxidases. The enzyme laccase catalyzes the oxidation of paradiphenols, aminophenols, polyphenols, polyamines, lignin, and aryl diamines as well as some inorganic ions. This chapter concludes with the applications of lignin-modifying enzymes, ligninolytic enzymes and implications for lignin degradation.