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Metabolic engineering of the flavone-C-glycoside pathway using polyprotein technology

Lookup NU author(s): Dr Melissa Brazier-Hicks, Professor Robert Edwards

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Abstract

AbstractC-Glycosylated flavonoids are biologically active plant natural products linked to dietary health benefits. We have used polyprotein expression technology to reconstruct part of the respective biosynthetic pathway in tobacco and yeast, such that dihydrochalcone and flavanone precursors are directly converted to C-glycosides. The polyprotein system developed facilitated the simple and efficient co-expression of pathway enzymes requiring different sub-cellular localization in both plants and yeast. The pathway to flavone-C-glucosides comprised a flavanone 2-hydroxylase (F2H), co-expressed with a C-glucosyltransferase (CGT). While pathway engineering in tobacco resulted in only minor C-glycoside formation, when fed with the flavanone naringenin, yeast transformed with the F2H-CGT polyprotein construct produced high concentrations of 2-hydroxynaringenin-C-glucoside in the medium. These fermentation products could then be readily chemically converted to the respective flavone-C-glucosides. The efficiency of the biosynthesis was optimal when both the F2H and CGT were obtained from the same species (rice). These results confirm the coupled roles of the F2H and CGT in producing C-glucosides in vivo, with the use of the polyprotein expression system in yeast offering a useful system to optimize the synthesis of these natural products in quantities suitable for dietary studies. (c) 2012 Elsevier Inc. All rights reserved.


Publication metadata

Author(s): Brazier-Hicks Melissa, Edwards Robert

Publication type: Article

Journal: Metabolic Engineering

Year: 2013

Volume: 16

Pages: 11-20

Online publication date: 13/12/2012

Acceptance date: 06/11/2012

Print publication date: 01/03/2013

ISSN (print): 1096-7176

ISSN (electronic): 1096-7184

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.ymben.2012.11.004

DOI: 10.1016/j.ymben.2012.11.004


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