To carry out their activities, Research Teams of the Frédéric Joliot Institute for Life Sciences have developed high-profile technological platforms in many areas : biomedical imaging, structural biology, metabolomics, High-Throughput screening, level 3 microbiological safety laboratory...
All the news of the Institute of life sciences Frédéric Joliot
Scientific result | Photosynthesis | Microalgae | Biotechnology
Through two publications, an I2BC team demonstrates the high biotechnological potential of the model cyanobacterium Synechocystis PCC 6803 for the photosynthetic production of high value-added organic compounds, the terpenes.
For several years, Franck and Corinne Chauvat's team has been interested in the potential of cyanobacteria, photosynthetic microalgae that colonize most of our planet's ecosystems, for the photosynthetic production (capture of CO2) of terpenes, organic compounds of interest that can be used in the pharmaceuticals and cosmetics industry, biofuels or bioplastics (see November 2020 news). Their search for the ideal cyanobacterial strain for such applications led them i) to use the robust cyanobacterium Synechocystis PCC 6803, for which they developed powerful tools for heterologous gene expression, and ii) to explore its ability to produce various, chemically different, terpenes.
In publication #1, the researchers performed for the first time the engineering and comparative analysis of Synechocystis PCC 6803 for the photosynthetic production of limonene and pinene, two 10-carbon monoterpenes, and bisabolene, farnesene and santalene, three 15-carbon sesquiterpenes. The 5 terpene-producing strains are robust and genetically stable. Synechocystis PCC 6803 efficiently and stably produces farnesene and santalene, which is totally unprecedented for this model organism as well as for any other cyanobacteria, to date. The authors also showed that Synechocystis PCC 6803 efficiently produces terpenes when nitrate, the usual source of nitrogen for cyanobacteria, is replaced by urea, which should save costs for future industrial production or combine production and depollution.
In publication #2, the researchers questioned the involvement of CP12, a protein that regulates CO2 assimilation in photosynthetic organisms via the Calvin-Benson-Bassham (CBB) cycle, in terpene production in Synechocystis PCC 6803. They showed that CP12 regulates the redox balance of NADPH that feeds the methylerythritol 4-phosphate (MEP) pathway at the origin of the synthesis of terpene synthase substrates: geranyl diphosphate (GPP) and farnesyl diphosphate (FPP). In the absence of CP12, the production of both types of terpenes is increased in cyanobacteria expressing the corresponding terpene synthase. Interestingly, the authors report that, contrary to what was expected, CP12 is not required for growth under photoautotrophy in continuous light and under light/dark cycle, whereas it is essential for glucose catabolism that supports growth in the absence of photosynthesis. The results of these two publications show that Synechocystis PCC 6803 is a robust "toolbox" for optimal photosynthetic production of terpenes, a class of hydrocarbons with multiple properties
Contacts : Publication 1 : Franck Chauvat (firstname.lastname@example.org ; email@example.com) Publication 2 : Corinne Cassier-Chauvat (Corinne.Cassier-Chauvat@cea.fr ; firstname.lastname@example.org) Inspired from : https://www.i2bc.paris-saclay.fr/news-2022/#news86 and https://www.i2bc.paris-saclay.fr/news-2022/#news79
1. Victoire Blanc‑Garin, Célia Chenebault, Encarnación Diaz‑Santos, Marine Vincent, Jean‑François Sassi , Corinne Cassier‑Chauvat, Franck Chauvat. Exploring the potential of the model cyanobacterium Synechocystis PCC 6803 for the photosynthetic production of various high‑value terpenes. Biotechnology for Biofuels and Bioproducts (2022) 15:110https://doi.org/10.1186/s13068-022-02211-02. Victoire Blanc-Garin, Théo Veaudor, Pierre Sétif, Brigitte Gontero, Stéphane D. Lemaire, Franck Chauvat, Corinne Cassier-Chauvat. First in vivo analysis of the regulatory protein CP12 of the model cyanobacterium Synechocystis PCC 6803: Biotechnological implications. Front. Plant Sci., 13 September 2022 ; https://doi.org/10.3389/fpls.2022.999672
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.