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Plants 2017, 6(3), 28; doi:10.3390/plants6030028

The Polyketide Components of Waxes and the Cer-cqu Gene Cluster Encoding a Novel Polyketide Synthase, the β-Diketone Synthase, DKS

Section for Biomolecular Sciences, Department of Biology, University of Copenhagen, Ole Maaloees Vej 5, DK-2200 Copenhagen N, Denmark
Received: 2 May 2017 / Revised: 21 June 2017 / Accepted: 30 June 2017 / Published: 10 July 2017
(This article belongs to the Special Issue The Plant Cuticle)
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Abstract

The primary function of the outermost, lipophilic layer of plant aerial surfaces, called the cuticle, is preventing non-stomatal water loss. Its exterior surface is often decorated with wax crystals, imparting a blue–grey color. Identification of the barley Cer-c, -q and -u genes forming the 101 kb Cer-cqu gene cluster encoding a novel polyketide synthase—the β-diketone synthase (DKS), a lipase/carboxyl transferase, and a P450 hydroxylase, respectively, establishes a new, major pathway for the synthesis of plant waxes. The major product is a β-diketone (14,16-hentriacontane) aliphatic that forms long, thin crystalline tubes. A pathway branch leads to the formation of esterified alkan-2-ols. View Full-Text
Keywords: type III polyketide synthase (PKS); diketone synthase (DKS); β-diketones; hydroxy-β-diketones; esterified alkan-2-ols; Cer-cqu gene cluster; plant waxes; cytochrome P450; lipase/carboxyl esterase/thioesterase type III polyketide synthase (PKS); diketone synthase (DKS); β-diketones; hydroxy-β-diketones; esterified alkan-2-ols; Cer-cqu gene cluster; plant waxes; cytochrome P450; lipase/carboxyl esterase/thioesterase
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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von Wettstein-Knowles, P. The Polyketide Components of Waxes and the Cer-cqu Gene Cluster Encoding a Novel Polyketide Synthase, the β-Diketone Synthase, DKS. Plants 2017, 6, 28.

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