Triterpene hydrocarbon production engineered into a metabolically versatile host— Rhodobacter capsulatus
- Department of Chemical Engineering The Pennsylvania State University University Park Pennsylvania 16802
- Department of Pharmaceutical Sciences University of Kentucky Lexington Kentucky 40536
ABSTRACT Triterpene hydrocarbon biosynthesis of the ancient algae Botryococcus braunii was installed into Rhodobacter capsulatus to explore the production of C 30 hydrocarbon in a host capable of diverse growth habits—utilizing carbohydrate, sunlight or hydrogen (with CO 2 fixation) as alternative energy feedstocks. Engineering an enhanced MEP pathway was also used to augment triterpene accumulation. Despite dramatically different sources of carbon and reducing power, nearly the same level of botryococcene or squalene (∼5 mg oil/g‐dry‐weight [gDW]) was achieved in small‐scale aerobic heterotrophic, anaerobic photoheterotrophic, and aerobic chemoautotrophic growth conditions. A glucose fed‐batch bioreactor reached 40 mg botryococcene/L (∼12 mg/gDW), while autotrophic bioreactor performance with CO 2 , H 2 , and O 2 reached 110 mg/L (16.7 mg/gDW) during batch and 60 mg/L (23 mg/gDW) during continuous operation at a dilution rate corresponding to about 10% of μ max . Batch and continuous autotrophic specific productivity was found to reach 0.5 and 0.32 mg triterpene/g DW/h, comparable to prior reports for terpene production driven by heterotrophic growth conditions. This demonstrates the feasibility of alternative feedstocks and trophic modes to provide comparable routes to biochemicals that do not rely on sugar. Biotechnol. Bioeng. 2015;112: 1523–1532. © 2015 Wiley Periodicals, Inc.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- ARPA‐e Electrofuels, DE‐AR0000092
- OSTI ID:
- 1400909
- Journal Information:
- Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Vol. 112 Journal Issue: 8; ISSN 0006-3592
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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