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      Harnessing bioengineered microbes as a versatile platform for space nutrition

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          Abstract

          Human enterprises through the solar system will entail long-duration voyages and habitation creating challenges in maintaining healthy diets. We discuss consolidating multiple sensory and nutritional attributes into microorganisms to develop customizable food production systems with minimal inputs, physical footprint, and waste. We envisage that a yeast collection bioengineered for one-carbon metabolism, optimal nutrition, and diverse textures, tastes, aromas, and colors could serve as a flexible food-production platform. Beyond its potential for supporting humans in space, bioengineered microbial-based food could lead to a new paradigm for Earth’s food manufacturing that provides greater self-sufficiency and removes pressure from natural ecosystems.

          Abstract

          Long-duration human space travel creates challenges for maintaining healthy diets. Here the authors discuss using synthetic biology approaches to modify yeast into an optimal, and enjoyable, food production platform.

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          Most cited references75

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          Conversion of Escherichia coli to Generate All Biomass Carbon from CO 2

          Summary The living world is largely divided into autotrophs that convert CO2 into biomass and heterotrophs that consume organic compounds. In spite of widespread interest in renewable energy storage and more sustainable food production, the engineering of industrially relevant heterotrophic model organisms to use CO2 as their sole carbon source has so far remained an outstanding challenge. Here, we report the achievement of this transformation on laboratory timescales. We constructed and evolved Escherichia coli to produce all its biomass carbon from CO2. Reducing power and energy, but not carbon, are supplied via the one-carbon molecule formate, which can be produced electrochemically. Rubisco and phosphoribulokinase were co-expressed with formate dehydrogenase to enable CO2 fixation and reduction via the Calvin-Benson-Bassham cycle. Autotrophic growth was achieved following several months of continuous laboratory evolution in a chemostat under intensifying organic carbon limitation and confirmed via isotopic labeling.
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            Control of lipid accumulation in the yeast Yarrowia lipolytica.

            A genomic comparison of Yarrowia lipolytica and Saccharomyces cerevisiae indicates that the metabolism of Y. lipolytica is oriented toward the glycerol pathway. To redirect carbon flux toward lipid synthesis, the GUT2 gene, which codes for the glycerol-3-phosphate dehydrogenase isomer, was deleted in Y. lipolytica in this study. This Delta gut2 mutant strain demonstrated a threefold increase in lipid accumulation compared to the wild-type strain. However, mobilization of lipid reserves occurred after the exit from the exponential phase due to beta-oxidation. Y. lipolytica contains six acyl-coenzyme A oxidases (Aox), encoded by the POX1 to POX6 genes, that catalyze the limiting step of peroxisomal beta-oxidation. Additional deletion of the POX1 to POX6 genes in the Delta gut2 strain led to a fourfold increase in lipid content. The lipid composition of all of the strains tested demonstrated high proportions of FFA. The size and number of the lipid bodies in these strains were shown to be dependent on the lipid composition and accumulation ratio.
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              The industrial yeast Pichia pastoris is converted from a heterotroph into an autotroph capable of growth on CO 2

              The methylotrophic yeast Pichia pastoris is widely used in the manufacture of industrial enzymes and pharmaceuticals. Like most biotechnological production hosts, P. pastoris is heterotrophic and grows on organic feedstocks that have competing uses in the production of food and animal feed. In a step toward more sustainable industrial processes, we describe the conversion of P. pastoris into an autotroph that grows on CO2. By addition of eight heterologous genes and deletion of three native genes, we engineer the peroxisomal methanol-assimilation pathway of P. pastoris into a CO2 fixation pathway resembling the Calvin-Benson-Bassham cycle, the predominant natural CO2 fixation pathway. The resulting strain can grow continuously with CO2 as a sole carbon source at a µmax of 0.008 h-1. The specific growth rate was further improved to 0.018 h-1 by adaptive laboratory evolution. This engineered P. pastoris strain may promote sustainability by sequestering the greenhouse gas CO2 and by avoiding consumption of an organic feedstock with alternative uses in food production.
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                Author and article information

                Contributors
                briardo.llorente@mq.edu.au
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                19 October 2022
                19 October 2022
                2022
                : 13
                : 6177
                Affiliations
                [1 ]GRID grid.1004.5, ISNI 0000 0001 2158 5405, ARC Center of Excellence in Synthetic Biology, , Macquarie University, ; Sydney, NSW 2109 Australia
                [2 ]GRID grid.1004.5, ISNI 0000 0001 2158 5405, School of Natural Sciences, , Macquarie University, ; Sydney, NSW 2109 Australia
                [3 ]GRID grid.1680.f, ISNI 0000 0004 0559 5189, New South Wales Department of Primary Industries, ; Orange, NSW 2800 Australia
                Author information
                http://orcid.org/0000-0002-3727-1395
                http://orcid.org/0000-0002-0594-3441
                http://orcid.org/0000-0003-2888-3549
                http://orcid.org/0000-0001-9127-3175
                http://orcid.org/0000-0001-9015-9418
                Article
                33974
                10.1038/s41467-022-33974-7
                9582011
                36261466
                b1b78b3a-54e2-4f8c-bb89-aabcfb414ba6
                © The Author(s) 2022

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 25 February 2022
                : 10 October 2022
                Categories
                Perspective
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                © The Author(s) 2022

                Uncategorized
                applied microbiology,metabolic engineering,synthetic biology
                Uncategorized
                applied microbiology, metabolic engineering, synthetic biology

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