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High-Yielding Terpene-Based Biofuel Production in Rhodobacter capsulatus .
ACS Synthetic Biology 2021 June 9
Energy crisis and global climate change have driven an increased effort toward biofuel synthesis from renewable feedstocks. Herein, purple nonsulfur photosynthetic bacterium (PNSB) of Rhodobacter capsulatus was explored as a platform for high-titer production of a terpene-based advanced biofuel-bisabolene. A multilevel engineering strategy such as promoter screening, improving the NADPH availability, strengthening the precursor supply, suppressing the side pathways, and introducing a heterologous mevalonate pathway, was used to improve the bisabolene titer in R. capsulatus . The above strategies enabled a 35-fold higher titer of bisabolene than that of the starting strain, reaching 1089.7 mg/L from glucose in a shake flask. The engineered strain produced 9.8 g/L bisabolene with a yield of >0.196 g/g-glucose under the two-phase fed-batch fermentation, which corresponds to >78% of theoretical maximum. Taken together, our work represents one of the pioneering studies to demonstrate PNSB as a promising platform for terpene-based advanced biofuel production.
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