Lignin‐Degrading Enzymes: An Overview

Chapter 10 Lignin-Degrading Enzymes: An Overview Rajni Hatti-Kaul, Rajni Hatti-KaulSearch for more papers by this authorVictor Ibrahim, Victor IbrahimSearch for more papers by this author Rajni Hatti-Kaul, Rajni Hatti-KaulSearch for more papers by this authorVictor Ibrahim, Victor IbrahimSearch for more papers by this author Book Editor(s):Shang-Tian Yang, Shang-Tian Yang William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USASearch for more papers by this authorHesham A El-Enshasy, Hesham A El-Enshasy Institute of Bioproduct Development (IBD), Universiti Teknologi Malaysia (UTM), Johor Bahru, Johor, MalaysiaSearch for more papers by this authorNuttha Thongchul, Nuttha Thongchul Institute of Biotechnology and Genetic Engineering, Chulalongkorn University, Bangkok, ThailandSearch for more papers by this author First published: 12 July 2013 https://doi.org/10.1002/9781118642047.ch10Citations: 7 AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onFacebookTwitterLinked InRedditWechat 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. Citing Literature Bioprocessing Technologies in Biorefinery for Sustainable Production of Fuels, Chemicals, and Polymers RelatedInformation