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Production of phytochromes by high cell density E. coli fermentation.

Phytochromes are important photoreceptors of plants, bacteria and fungi responsive to light in the red and far-red spectrum. For increasing applications in basic research, synthetic biology and materials sciences, it is required to recombinantly produce and purify phytochromes in high amounts. An ideal host organism for this purpose is E. coli due to its widespread use, fast growth and ability for high cell density fermentation. Here, we describe the development of a generic platform for the production of phytochromes in E. coli that is compatible with high cell density fermentation. We exemplify our approach by the production of the photosensory domains of phytochrome B (PhyB) from A. thaliana and of the cyanobacterial phytochrome 1 (Cph1) from Synechocystis PCC 6803 in the multigram scale per 10 L fermentation run.