5 Biochemistry of Terpenoids: Monoterpenes, Sesquiterpenes and Diterpenes*

Annual Plant Reviews book series, Volume 40: Biochemistry of Plant Secondary Metabolism
Mohamed Ashour

Mohamed Ashour

Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Heidelberg, Germany

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Michael Wink

Michael Wink

Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Heidelberg, Germany

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Jonathan Gershenzon

Jonathan Gershenzon

Max-Planck-Institute of Chemical Ecology, Jena, Germany

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First published: 19 April 2018
Citations: 27
This article was originally published in 2010 in Biochemistry of Plant Secondary Metabolism, Volume 40 (ISBN 9781405183970) of the Annual Plant Reviews book series, this volume edited by Michael Wink. The article was republished in Annual Plant Reviews online in April 2018.
*
This chapter is an update from an earlier version from J. Gershenzon and W. Kreis printed in the first edition in 1999.

Abstract

Terpenoids represent the largest class of secondary metabolites and usually do not contain nitrogen or sulfur in their structures. Many terpenoids serve as defence compounds against microbes and herbivores and/or are signal molecules to attract pollinating insects, fruit-dispersing animals or predators which can destroy insect herbivores. As a consequence, many terpenoids have pronounced pharmacological activities and are therefore interesting for medicine and biotechnology. The first part of the biosynthesis is the generation of a C5 unit, such as isopentenyl diphosphate (IPP) or dimethylallyl diphosphate (DMAPP). Two independent pathways have been discovered that can produce the C5 unit: the mevalonate and the methylerythritol phosphate (MEP) pathway. Depending on the number of C5 units, we distinguish hemiterpenes C5, monoterpenes including iridoids (C10), sesquiterpenes (C15), diterpenes (C20), sesterterpenes (C25), triterpenes (including steroids) (C30), tetraterpenes (C40) and polyterpenes (>C40). The biosynthesis (including enzymes, genes and their regulation) of mevalonate and the methylerythritol phosphate pathway and the consecutive pathways leading to mono-, sesqui- and diterpenes are discussed in this chapter in detail.

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