Title: Thermodynamic Constraints on Electromicrobial Protein Production

Journal Article · · Frontiers in Bioengineering and Biotechnology

Global consumption of protein is projected to double by the middle of the 21st century. However, protein production is one of the most energy intensive and environmentally damaging parts of the food supply system today. Electromicrobial production technologies that combine renewable electricity and CO 2 -fixing microbial metabolism could dramatically increase the energy efficiency of commodity chemical production. Here we present a molecular-scale model that sets an upper limit on the performance of any organism performing electromicrobial protein production. We show that engineered microbes that fix CO 2 and N 2 using reducing equivalents produced by H 2 -oxidation or extracellular electron uptake could produce amino acids with energy inputs as low as 64 MJ kg −1 , approximately one order of magnitude higher than any previous estimate of the efficiency of electromicrobial protein production. This work provides a roadmap for development of engineered microbes that could significantly expand access to proteins produced with a low environmental footprint.

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0020179
OSTI ID:
1845937
Journal Information:
Frontiers in Bioengineering and Biotechnology, Journal Name: Frontiers in Bioengineering and Biotechnology Vol. 10; ISSN 2296-4185
Publisher:
Frontiers Media SACopyright Statement
Country of Publication:
Switzerland
Language:
English

References (65)

Progress and Perspective of Electrocatalytic CO 2 Reduction for Renewable Carbonaceous Fuels and Chemicals journal September 2017
Transfer of Nitrogen Fixation ( nif ) Genes to Non‐diazotrophic Hosts journal March 2020
Toward understanding the origin and evolution of cellular organisms journal September 2019
Engineering Ralstonia eutropha for Production of Isobutanol from CO2, H2, and O2 book June 2012
Electrochemical interrogations of the Mtr cytochromes from Shewanella: opening a potential window journal June 2008
Meat alternatives: life cycle assessment of most known meat substitutes journal July 2015
What is the maximum efficiency with which photosynthesis can convert solar energy into biomass? journal April 2008
Protein efficiency per unit energy and per unit greenhouse gas emissions: Potential contribution of diet choices to climate change mitigation journal October 2011
Food security: The challenge of the present journal May 2018
Bacterial protein for food and feed generated via renewable energy and direct air capture of CO2: Can it reduce land and water use? journal September 2019
Three perspectives on sustainable food security: efficiency, demand restraint, food system transformation. What role for life cycle assessment? journal June 2014
Photons to formate: Efficient electrochemical solar energy conversion via reduction of carbon dioxide journal September 2014
Low cost and efficient alloy electrocatalysts for CO2 reduction to formate journal July 2019
Power-to-Protein: Carbon Fixation with Renewable Electric Power to Feed the World journal June 2020
Constraints on the Efficiency of Engineered Electromicrobial Production journal October 2020
Designing biological compartmentalization journal December 2012
Bioenergetic challenges of microbial iron metabolisms journal July 2011
Engineering Microbes to Produce Fuel, Commodities, and Food from CO2 journal October 2020
Assessment of protein adequacy in developing countries: quality matters journal August 2012
Light-Driven Heterogeneous Reduction of Carbon Dioxide: Photocatalysts and Photoelectrodes journal August 2015
Microbial Protein out of Thin Air: Fixation of Nitrogen Gas by an Autotrophic Hydrogen-Oxidizing Bacterial Enrichment journal March 2020
Production of Endotoxin-Free Microbial Biomass for Food Applications by Gas Fermentation of Gram-Positive H 2 -Oxidizing Bacteria journal March 2021
A Tunable Protein Piston That Breaks Membranes to Release Encapsulated Cargo journal February 2016
Engineered Assimilation of Exogenous and Endogenous Formate in Escherichia coli journal June 2017
Frontiers, Opportunities, and Challenges in Biochemical and Chemical Catalysis of CO 2 Fixation journal June 2013
Environmental Impacts of Cultured Meat Production journal July 2011
Water Use in Global Livestock Production—Opportunities and Constraints for Increasing Water Productivity journal December 2020
Evolution of a designed protein assembly encapsulating its own RNA genome journal December 2017
Global bioenergy resources journal January 2014
Harnessing the power of microbial autotrophy journal September 2016
Control of nitrogen fixation in bacteria that associate with cereals journal December 2019
Global investigation of an engineered nitrogen-fixing Escherichia coli strain reveals regulatory coupling between host and heterologous nitrogen-fixation genes journal July 2018
Making quantitative sense of electromicrobial production journal May 2019
Identification of a pathway for electron uptake in Shewanella oneidensis journal August 2021
Streptomyces thermoautotrophicus does not fix nitrogen journal February 2016
Electrochemical nitrogen fixation and utilization: theories, advanced catalyst materials and system design journal January 2019
Eutrophication of aquatic ecosystems: Bistability and soil phosphorus journal June 2005
A dicarboxylate/4-hydroxybutyrate autotrophic carbon assimilation cycle in the hyperthermophilic Archaeum Ignicoccus hospitalis journal May 2008
Identifying the missing steps of the autotrophic 3-hydroxypropionate CO2 fixation cycle in Chloroflexus aurantiacus journal December 2009
Global food demand and the sustainable intensification of agriculture journal November 2011
Refactoring the nitrogen fixation gene cluster from Klebsiella oxytoca journal April 2012
Computational protein design enables a novel one-carbon assimilation pathway journal March 2015
Photovoltaic-driven microbial protein production can use land and sunlight more efficiently than conventional crops journal June 2021
Rethinking Food and Agriculture 2020-2030: The Second Domestication of Plants and Animals, the Disruption of the Cow, and the Collapse of Industrial Livestock Farming journal April 2021
KEGG: Kyoto Encyclopedia of Genes and Genomes journal January 2000
KEGG: integrating viruses and cellular organisms journal October 2020
BioNumbers—the database of key numbers in molecular and cell biology journal October 2009
A 3-Hydroxypropionate/4-Hydroxybutyrate Autotrophic Carbon Dioxide Assimilation Pathway in Archaea journal December 2007
An Outlook on Microalgal Biofuels journal August 2010
Water splitting–biosynthetic system with CO 2 reduction efficiencies exceeding photosynthesis journal June 2016
Reducing food’s environmental impacts through producers and consumers journal May 2018
Tracking Electron Uptake from a Cathode into Shewanella Cells: Implications for Energy Acquisition from Solid-Substrate Electron Donors journal February 2018
Nitrogen Fixation and Hydrogen Metabolism in Cyanobacteria journal November 2010
The Physics of Solar Cells book January 2003
Improving Photosynthetic Efficiency for Greater Yield journal June 2010
A synthetic system links FeFe-hydrogenases to essential E. coli sulfur metabolism journal January 2011
Using synthetic biology to increase nitrogenase activity journal February 2016
Electrical energy storage with engineered biological systems journal May 2019
A Minimal Nitrogen Fixation Gene Cluster from Paenibacillus sp. WLY78 Enables Expression of Active Nitrogenase in Escherichia coli journal October 2013
The Bacterial Carbon-Fixing Organelle Is Formed by Shell Envelopment of Preassembled Cargo journal September 2013
Single Cell Protein—State-of-the-Art, Industrial Landscape and Patents 2001–2016 journal October 2017
Construction of a Geobacter Strain With Exceptional Growth on Cathodes journal July 2018
Energy Inputs in Food Crop Production in Developing and Developed Nations journal January 2009
Biocatalysis for the application of CO 2 as a chemical feedstock journal January 2015
Functional reconstitution of a bacterial CO2 concentrating mechanism in Escherichia coli journal October 2020