Semi-artificial chloroplasts to manufacture biotechnologically relevant products

Customized photosynthesis

During photosynthesis, plants use solar energy to convert water and carbon dioxide into chemical energy and biomass. They apply this process in order to generate biomass, i.e. new cellular building blocks. Photosynthesis is relevant, for example, for the production of biofuels. Following the same principle, it would also be possible to generate substances that are building-blocks for the industrial synthesis of drugs and other chemicals, such as alkanes. The researchers want to customise the semi-artificial chloroplasts in such a way that they would primarily generate products that are biotechnologically relevant and commercially viable. For this purpose, the RUB team headed by Thomas Happe collaborates with colleagues from the French research centre "CEA Cadarache" and the University of Oxford, UK.

Modifying the chloroplasts' genetic make-up

In natural chloroplasts, special protein complexes, so-called photosystems, absorb sunlight and generate high-energy electrons. A number of other proteins subsequently transport these electrons, until their energy is eventually utilised in reactions that result in the creation of new cellular building blocks. The "Sun2Chem" project is striving to alter the genetic system of natural chloroplasts using synthetic biology tools. The constructed semi-artificial system would therefore contain modified proteins. Not only would this render the electron transport chain more efficient, it could also result in a new reaction where desirable products are generated, rather than cellular buildings blocks.