Journal
PLANTA
Volume 234, Issue 5, Pages 903-914Publisher
SPRINGER
DOI: 10.1007/s00425-011-1444-6
Keywords
Arabidopsis; Catharanthus; Isoprenoid; Mevalonic acid pathway; Peroxisome
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Funding
- Le STUDIUM (Agency for Research and Hosting Foreign associated Researchers in the Centre region, France)
- Ministere de l'Enseignement Superieur et de la Recherche (France)
- Ministere de l'Enseignement Superieur et de la Recherche Scientifique (Tunisie)
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In plants, the mevalonic acid (MVA) pathway provides precursors for the formation of triterpenes, sesquiterpenes, phytosterols and primary metabolites important for cell integrity. Here, we have cloned the cDNA encoding enzymes catalysing the final three steps of the MVA pathway from Madagascar periwinkle (Catharanthus roseus), mevalonate kinase (MVK), 5-phosphomevalonate kinase (PMK) and mevalonate 5-diphosphate decarboxylase (MVD). These cDNA were shown to functionally complement MVA pathway deletion mutants in the yeast Saccharomyces cerevisiae. Transient transformations of C. roseus cells with yellow fluorescent protein (YFP)-fused constructs reveal that PMK and MVD are localised to the peroxisomes, while MVK was cytosolic. These compartmentalisation results were confirmed using the Arabidopsis thaliana MVK, PMK and MVD sequences fused to YFP. Based on these observations and the arguments raised here we conclude that the final steps of the plant MVA pathway are localised to the peroxisome.
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