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n-Butanol production by Rhodopseudomonas palustris TIE-1

Journal Article · · Communications Biology
Anthropogenic carbon dioxide (CO2) release in the atmosphere from fossil fuel combustion has inspired scientists to study CO2 to biofuel conversion. Oxygenic phototrophs such as cyanobacteria have been used to produce biofuels using CO2. However, oxygen generation during oxygenic photosynthesis adversely affects biofuel production efficiency. To produce n-butanol (biofuel) from CO2, here we introduce an n-butanol biosynthesis pathway into an anoxygenic (non-oxygen evolving) photoautotroph, Rhodopseudomonas palustris TIE-1 (TIE-1). Using different carbon, nitrogen, and electron sources, we achieve n-butanol production in wild-type TIE-1 and mutants lacking electron-consuming (nitrogen-fixing) or acetyl-CoA-consuming (polyhydroxybutyrate and glycogen synthesis) pathways. The mutant lacking the nitrogen-fixing pathway produce the highest n-butanol. Coupled with novel hybrid bioelectrochemical platforms, this mutant produces n-butanol using CO2, solar panel-generated electricity, and light with high electrical energy conversion efficiency. Overall, this approach showcases TIE-1 as an attractive microbial chassis for carbon-neutral n-butanol bioproduction using sustainable, renewable, and abundant resources.
Research Organization:
Washington Univ., St. Louis, MO (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); US Army Research Office (ARO); Gordon and Betty Moore Foundation; USDOD DEPSCoR; David and Lucile Packard Foundation
Grant/Contract Number:
SC0014613; AC52-07NA27344
OSTI ID:
1904440
Report Number(s):
LLNL-JRNL-812309; PII: 2781
Journal Information:
Communications Biology, Journal Name: Communications Biology Journal Issue: 1 Vol. 4; ISSN 2399-3642
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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