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Remodeling the isoprenoid pathway in tobacco by expressing the cytoplasmic mevalonate pathway in chloroplasts

Paper ID Volume ID Publish Year Pages File Format Full-Text
31625 44825 2012 10 PDF Available
Title
Remodeling the isoprenoid pathway in tobacco by expressing the cytoplasmic mevalonate pathway in chloroplasts
Abstract

Metabolic engineering to enhance production of isoprenoid metabolites for industrial and medical purposes is an important goal. The substrate for isoprenoid synthesis in plants is produced by the mevalonate pathway (MEV) in the cytosol and by the 2-C-methyl-d-erythritol 4-phosphate (MEP) pathway in plastids. A multi-gene approach was employed to insert the entire cytosolic MEV pathway into the tobacco chloroplast genome. Molecular analysis confirmed the site-specific insertion of seven transgenes and homoplasmy. Functionality was demonstrated by unimpeded growth on fosmidomycin, which specifically inhibits the MEP pathway. Transplastomic plants containing the MEV pathway genes accumulated higher levels of mevalonate, carotenoids, squalene, sterols, and triacyglycerols than control plants. This is the first time an entire eukaryotic pathway with six enzymes has been transplastomically expressed in plants. Thus, we have developed an important tool to redirect metabolic fluxes in the isoprenoid biosynthesis pathway and a viable multigene strategy for engineering metabolism in plants.

▶ Cytosol isoprenoid substrate synthesis pathway genes were inserted into chloroplast genome. ▶ An entire eukaryotic pathway with six enzymes has been expressed in chloroplasts for the first time. ▶ Chloroplast metabolic engineering enhanced production of isoprenoids and linked metabolites. ▶ This multigene strategy is a tool to redirect and engineer isoprenoid metabolism in plants.

Keywords
MEV, mevalonate; MEP, 2-C-methyl-d-erythritol 4-phosphate; IPP, isopentenyl diphosphate; DMAPP, dimethylallyl diphosphate; GPP, geranyl diphosphate; FPP, farnesyl diphosphate; GGPP, geranylgeranyl diphosphate; HMGR, 3-hydroxy-3methylglutaryl-coenzyme A re
First Page Preview
Remodeling the isoprenoid pathway in tobacco by expressing the cytoplasmic mevalonate pathway in chloroplasts
Publisher
Database: Elsevier - ScienceDirect
Journal: Metabolic Engineering - Volume 14, Issue 1, January 2012, Pages 19–28
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering