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Molecular Plant Advance Access published online on November 12, 2009
Molecular Plant, doi:10.1093/mp/ssp088
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© The Author 2009. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

Chloroplast Proteomics and the Compartmentation of Plastidial Isoprenoid Biosynthetic Pathways

Jacques Joyarda, Myriam Ferrob, Christophe Masselonb, Daphné Seigneurin-Bernya, Daniel Salvia, Jérôme Garinb and Norbert Rollanda,1

a Laboratoire de Physiologie Cellulaire Végétale; UMR 5168; CEA; CNRS; INRA; Université Joseph Fourier; iRTSV, CEA-Grenoble, 38054 Grenoble-cedex 9, France
b Laboratoire Etude de la Dynamique des Protéomes; U880; CEA; INSERM; Université Joseph Fourrier; iRTSV, CEA-Grenoble, 38054 Grenoble-cedex 9, France

1 To whom correspondence should be addressed. E-mail nrolland{at}cea.fr, tel. +33 (0)4 38 78 49 86.

Recent advances in the proteomic field have allowed high-throughput experiments to be conducted on chloroplast samples. Many proteomic investigations have focused on either whole chloroplast or sub-plastidial fractions. To date, the Plant Protein Database (PPDB, Sun et al., 2009) presents the most exhaustive chloroplast proteome available online. However, the accurate localization of many proteins that were identified in different sub-plastidial compartments remains hypothetical. Ferro et al. (2009) went a step further into the knowledge of Arabidopsis thaliana chloroplast proteins with regards to their accurate localization within the chloroplast by using a semi-quantitative proteomic approach known as spectral counting. Their proteomic strategy was based on the accurate mass and time tags (AMT) database approach and they built up AT_CHLORO, a comprehensive chloroplast proteome database with sub-plastidial localization and curated information on envelope proteins. Comparing these two extensive databases, we focus here on about 100 enzymes involved in the synthesis of chloroplast-specific isoprenoids. Well known pathways (i.e. compartmentation of the methyl erythritol phosphate biosynthetic pathway, of tetrapyrroles and chlorophyll biosynthesis and breakdown within chloroplasts) validate the spectral counting-based strategy. The same strategy was then used to identify the precise localization of the biosynthesis of carotenoids and prenylquinones within chloroplasts (i.e. in envelope membranes, stroma, and/or thylakoids) that remains unclear until now.

Key Words: Non-mevalonate pathway • chlorophyll biosynthesis • chlorophyll degradation • carotenoid biosynthesis • prenylquinone biosynthesis • envelope • stroma • thylakoids


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