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Bioprocessing analysis of Pyrococcus furiosus strains engineered for CO2-based 3-hydroxypropionate production

Journal Article · · Biotechnology and Bioengineering
DOI:https://doi.org/10.1002/bit.25584· OSTI ID:1342894
 [1];  [2];  [2];  [2];  [3];  [3];  [3];  [3];  [2]
  1. North Carolina State Univ., Raleigh, NC (United States); Office of Scientific and Technical Information (OSTI)
  2. North Carolina State Univ., Raleigh, NC (United States)
  3. Univ. of Georgia, Athens, GA (United States)

In this paper, metabolically engineered strains of the hyperthermophile Pyrococcus furiosus (Topt 95–100°C), designed to produce 3-hydroxypropionate (3HP) from maltose and CO2 using enzymes from the Metallosphaera sedula (Topt 73°C) carbon fixation cycle, were examined with respect to the impact of heterologous gene expression on metabolic activity, fitness at optimal and sub-optimal temperatures, gas-liquid mass transfer in gas-intensive bioreactors, and potential bottlenecks arising from product formation. Transcriptomic comparisons of wild-type P. furiosus, a genetically-tractable, naturally-competent mutant (COM1), and COM1-based strains engineered for 3HP production revealed numerous differences after being shifted from 95°C to 72°C, where product formation catalyzed by the heterologously-produced M. sedula enzymes occurred. At 72°C, significantly higher levels of metabolic activity and a stress response were evident in 3HP-forming strains compared to the non-producing parent strain (COM1). Gas–liquid mass transfer limitations were apparent, given that 3HP titers and volumetric productivity in stirred bioreactors could be increased over 10-fold by increased agitation and higher CO2 sparging rates, from 18 mg/L to 276 mg/L and from 0.7 mg/L/h to 11 mg/L/h, respectively. 3HP formation triggered transcription of genes for protein stabilization and turnover, RNA degradation, and reactive oxygen species detoxification. Lastly, the results here support the prospects of using thermally diverse sources of pathways and enzymes in metabolically engineered strains designed for product formation at sub-optimal growth temperatures.

Research Organization:
Univ. of Georgia, Athens, GA (United States); North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000081
OSTI ID:
1342894
Journal Information:
Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Journal Issue: 8 Vol. 112; ISSN 0006-3592
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Evaluation of 3-hydroxypropionate biosynthesis in vitro by partial introduction of the 3-hydroxypropionate/4-hydroxybutyrate cycle from Metallosphaera sedula journal September 2016
Pyrococcus furiosus , 30 years on’ journal February 2017
Extremely thermophilic microorganisms as metabolic engineering platforms for production of fuels and industrial chemicals journal November 2015
A simple biosynthetic pathway for 2,3-butanediol production in Thermococcus onnurineus NA1 journal March 2019

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