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Title: Targeted Enhancement of H2 and CO2 Uptake for Autotrophic Production of Biodiesel in the Lithoautotrophic Bacterium Ralsonia Eutropha

Abstract

CO2 and H2 are promising feedstocks for production of valuable biocompounds. Ralstonia eutropha utilizes these feedstocks to generate energy (ATP) and reductant (NAD(P)H) via oxidation of H2 by a membrane-bound (MBH) and a soluble hydrogenase (SH) for CO2 fixation by the Calvin-Benson-Bassham (CBB) cycle. Increased expression of the enzyme that fixes CO2 (RubisCO) resulted in 6-fold activity improvement in vitro, while increased expression of the MBH operon or the SH operon plus MBH operon maturation factors necessary for activity resulted in a 10-fold enhancement. Current research involves genetic manipulation of two endogenous cbb operons for increased expression, analysis of expression and activity of CBB/MBH/SH, cofactor ratios, and downstream products during autotrophic growth in control versus enhanced strains, and development of strategies for long-term, optimal overexpression. These studies will improve our understanding of autotrophic metabolism and provide a chassis strain for autotrophic production of biodiesel and other valuable carbon biocompounds.

Authors:
; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy Biomass Program
OSTI Identifier:
1087233
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: American Chemical Society. Abstracts of Papers of the 245th ACS National Meeting, 7-11 April 2013, New Orleans, Louisiana; Related Information: Abstract No. BIOT-186
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 59 BASIC BIOLOGICAL SCIENCES; Bioenergy; Chemical and Biosciences

Citation Formats

Eckert, C. A., Sullivan, R., Johnson, C., Yu, J., and Maness, P. C. Targeted Enhancement of H2 and CO2 Uptake for Autotrophic Production of Biodiesel in the Lithoautotrophic Bacterium Ralsonia Eutropha. United States: N. p., 2013. Web.
Eckert, C. A., Sullivan, R., Johnson, C., Yu, J., & Maness, P. C. Targeted Enhancement of H2 and CO2 Uptake for Autotrophic Production of Biodiesel in the Lithoautotrophic Bacterium Ralsonia Eutropha. United States.
Eckert, C. A., Sullivan, R., Johnson, C., Yu, J., and Maness, P. C. 2013. "Targeted Enhancement of H2 and CO2 Uptake for Autotrophic Production of Biodiesel in the Lithoautotrophic Bacterium Ralsonia Eutropha". United States.
@article{osti_1087233,
title = {Targeted Enhancement of H2 and CO2 Uptake for Autotrophic Production of Biodiesel in the Lithoautotrophic Bacterium Ralsonia Eutropha},
author = {Eckert, C. A. and Sullivan, R. and Johnson, C. and Yu, J. and Maness, P. C.},
abstractNote = {CO2 and H2 are promising feedstocks for production of valuable biocompounds. Ralstonia eutropha utilizes these feedstocks to generate energy (ATP) and reductant (NAD(P)H) via oxidation of H2 by a membrane-bound (MBH) and a soluble hydrogenase (SH) for CO2 fixation by the Calvin-Benson-Bassham (CBB) cycle. Increased expression of the enzyme that fixes CO2 (RubisCO) resulted in 6-fold activity improvement in vitro, while increased expression of the MBH operon or the SH operon plus MBH operon maturation factors necessary for activity resulted in a 10-fold enhancement. Current research involves genetic manipulation of two endogenous cbb operons for increased expression, analysis of expression and activity of CBB/MBH/SH, cofactor ratios, and downstream products during autotrophic growth in control versus enhanced strains, and development of strategies for long-term, optimal overexpression. These studies will improve our understanding of autotrophic metabolism and provide a chassis strain for autotrophic production of biodiesel and other valuable carbon biocompounds.},
doi = {},
url = {https://www.osti.gov/biblio/1087233}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2013},
month = {Tue Jan 01 00:00:00 EST 2013}
}

Conference:
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