PHOTOPROD : Metabolic engineering of cyanobacteria for the photoproduction of ethanol

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PROJECT 2010

 Title of the project

Metabolic engineering of cyanobacteria for photoproduction of ethanol

 Acronym

PHOTOPROD

 Coordinator

CNRS URA 2096, Bat 142 , CEA-Saclay, 91190 Gif sur Yvette
Responsable scientifique : Corinne Cassier-Chauvat

 Partners

Laboratoire de Biologie Intégrative (LBI), iBiTec-S, CEA-Saclay, Bat 142, 91190 Gif sur Yvette
Responsable scientifique : Franck Chauvat

Laboratoire d’Etude du Métabolisme et du Médicament (LEMM), iBiTec-S, CEA-Saclay, Bat 136, 91190 Gif sur Yvette
Responsable scientifique : Christophe Junot

 Duration

Two years
2010-2012

Summary

Production by cyanobacteria, the robust very-abundant photosynthetic microorganisms, of renewable biofuels from nature’s most plentiful resources : solar light, water, mineral salts and CO2, is of great public interest in allowing to recycle CO2 and save arable soils for crops production. However, cyanobacteria lack of some of the biofuels producing enzymes, emphasizing that an “ideal” photosynthetic organism for the production of bio-energies does not exist. Consequently, our 25-years experience in genetics and physiology of cyanobacteria will be used to construct promiscuous metabolic engineering cassettes for biofuel production, and test them in various favorable cyanobacteria to select a powerful cyanobacteria factory.

Practically, two metabolic engineering cassettes will be constructed for high-level photoproduction of ethanol and isobutanol. The resulting vectors will be introduced and tested in various cyanobacteria with different natural advantages. Synechocystis PCC6803 will be used because it possesses a promising alcohol dehydrogenase enzyme, it naturally produces abundant  PHB (biodegradable plastics) and because many oxidative-stress resistant mutants that should tolerate high-level alcohols production, have been constructed.

Synechoccus PCC 7002 will be tested because it grows well on glycerol, a cheap surplus of industries that might facilitate mass cultivation for large-scale biofuels production.

Synechoccus PC 7942 will also be tested because it could be reprogrammed for the weak and transient production of alcohols.

The main deliverables of the project will be :

  • promiscuous metabolic engineering cassettes ;
  • effective cyanobacterial factories for high-level photoproduction of alcohols ;
  • a better understanding of the cyanobacterial metabolism that also holds promises for the production of bioplastics and therapeutics.

Contact

Corinne Cassier-Chauvat
CNRS URA 2096, Bat 142 , CEA-Saclay, 91190 Gif sur Yvette
Tel : 01 69 08 35 74
corinne.cassier-chauvat@cea.fr