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Engineering the hyperthermophilic archaeon Pyrococcus furiosus for 1-propanol production

Journal Article · · Applied and Environmental Microbiology
DOI:https://doi.org/10.1128/aem.00471-25· OSTI ID:2549462

ABSTRACT <p> Society relies heavily on chemicals traditionally produced through the refinement of fossil fuels. The conversion of renewable biomass to value-added chemicals by microbes, particularly hyperthermophiles (T <sub>opt</sub> ≥80°C), offers a renewable alternative to this traditional approach. Herein, we describe the engineering of the hyperthermophilic archaeon <italic toggle='yes'>Pyrococcus furiosus</italic> , which grows optimally (T <sub>opt</sub> ) at 100°C, for the conversion of sugar to 1-propanol. This was accomplished by constructing a hybrid metabolic pathway consisting of two native and seven heterologously produced enzymes to convert acetyl-CoA from carbohydrate metabolism to 1-propanol. A total of eleven foreign genes from two other organisms were utilized, one from the thermophilic bacterium <italic toggle='yes'>Thermoanaerobacter</italic> sp. strain X514 and 10 from the thermoacidophilic archaeon <italic toggle='yes'>Metallosphaera sedula,</italic> both of which grow optimally near 70°C. The recombinant <italic toggle='yes'>P. furiosus</italic> strain produced 1-propanol at similar concentrations (up to ~1 mM) when incubated at 75°C to activate the gene products of <italic toggle='yes'>Thermoanaerobacter</italic> sp. strain X514 and <italic toggle='yes'>M. sedula</italic> and by initially incubating at 95°C for <italic toggle='yes'>P. furiosus</italic> growth and then subsequently returning to 75°C to promote 1-propanol formation. Note that 1-propanol was not produced if the culture was grown only at 95°C. This work has the potential for future optimization through harnessing the genome-scale metabolic model of <italic toggle='yes'>P. furiosus</italic> that was used herein to identify engineering targets to increase 1-propanol titer. </p> <sec> <title>IMPORTANCE

As petroleum reserves become increasingly strained, the development of renewable alternatives to traditional chemical synthesis becomes more important. In this work, a high-temperature biological system for sugar to 1-propanol conversion was demonstrated by metabolic engineering of the hyperthermophilic archaeon Pyrococcus furiosus (T opt 100°C). The engineered strain produced 1-propanol by temperature shifting from 75°C to 95°C and then back to 75°C to accommodate the temperature ranges for native and foreign proteins associated with 1-propanol biosynthesis. Genome-scale metabolic modeling informed the carbon and reductant flux in the system, identified potential factors limiting 1-propanol production, and revealed potential optimization targets.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0022192
OSTI ID:
2549462
Journal Information:
Applied and Environmental Microbiology, Journal Name: Applied and Environmental Microbiology Journal Issue: 5 Vol. 91; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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