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Kumar V, Kumar P, Maity SK, Agrawal D, Narisetty V, Jacob S, Kumar G, Bhatia SK, Kumar D, Vivekanand V. Recent advances in bio-based production of top platform chemical, succinic acid: an alternative to conventional chemistry. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2024; 17:72. [PMID: 38811976 PMCID: PMC11137917 DOI: 10.1186/s13068-024-02508-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Accepted: 04/20/2024] [Indexed: 05/31/2024]
Abstract
Succinic acid (SA) is one of the top platform chemicals with huge applications in diverse sectors. The presence of two carboxylic acid groups on the terminal carbon atoms makes SA a highly functional molecule that can be derivatized into a wide range of products. The biological route for SA production is a cleaner, greener, and promising technological option with huge potential to sequester the potent greenhouse gas, carbon dioxide. The recycling of renewable carbon of biomass (an indirect form of CO2), along with fixing CO2 in the form of SA, offers a carbon-negative SA manufacturing route to reduce atmospheric CO2 load. These attractive attributes compel a paradigm shift from fossil-based to microbial SA manufacturing, as evidenced by several commercial-scale bio-SA production in the last decade. The current review article scrutinizes the existing knowledge and covers SA production by the most efficient SA producers, including several bacteria and yeast strains. The review starts with the biochemistry of the major pathways accumulating SA as an end product. It discusses the SA production from a variety of pure and crude renewable sources by native as well as engineered strains with details of pathway/metabolic, evolutionary, and process engineering approaches for enhancing TYP (titer, yield, and productivity) metrics. The review is then extended to recent progress on separation technologies to recover SA from fermentation broth. Thereafter, SA derivatization opportunities via chemo-catalysis are discussed for various high-value products, which are only a few steps away. The last two sections are devoted to the current scenario of industrial production of bio-SA and associated challenges, along with the author's perspective.
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Affiliation(s)
- Vinod Kumar
- School of Water, Energy and Environment, Cranfield University, Cranfield, MK43 0AL, UK.
- Department of Bioscience and Bioengineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
| | - Pankaj Kumar
- Department of Chemical Engineering, School of Studies of Engineering and Technology, Guru Ghasidas Vishwavidyalaya (A Central University), Bilaspur, Chhattisgarh, 495009, India
| | - Sunil K Maity
- Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Hyderabad, Telangana, 502284, India.
| | - Deepti Agrawal
- Biochemistry and Biotechnology Area, Material Resource Efficiency Division, CSIR-Indian Institute of Petroleum, Dehradun, Uttarakhand, 248005, India
| | - Vivek Narisetty
- School of Water, Energy and Environment, Cranfield University, Cranfield, MK43 0AL, UK
| | - Samuel Jacob
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Chennai, Tamil Nadu, 603203, India
| | - Gopalakrishnan Kumar
- School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, 05029, Republic of Korea
| | - Dinesh Kumar
- School of Bioengineering & Food Technology, Shoolini University of Biotechnology and Management Sciences, Solan, Himachal Pradesh, 173229, India
| | - Vivekanand Vivekanand
- Centre for Energy and Environment, Malaviya National Institute of Technology Jaipur, Jaipur, Rajasthan, 302017, India
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2
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Kulakowski S, Banerjee D, Scown CD, Mukhopadhyay A. Improving microbial bioproduction under low-oxygen conditions. Curr Opin Biotechnol 2023; 84:103016. [PMID: 37924688 DOI: 10.1016/j.copbio.2023.103016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/17/2023] [Accepted: 10/07/2023] [Indexed: 11/06/2023]
Abstract
Microbial bioconversion provides access to a wide range of sustainably produced chemicals and commodities. However, industrial-scale bioproduction process operations are preferred to be anaerobic due to the cost associated with oxygen transfer. Anaerobic bioconversion generally offers limited substrate utilization profiles, lower product yields, and reduced final product diversity compared with aerobic processes. Bioproduction under conditions of reduced oxygen can overcome the limitations of fully aerobic and anaerobic bioprocesses, but many microbial hosts are not developed for low-oxygen bioproduction. Here, we describe advances in microbial strain engineering involving the use of redox cofactor engineering, genome-scale metabolic modeling, and functional genomics to enable improved bioproduction processes under low oxygen and provide a viable path for scaling these bioproduction systems to industrial scales.
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Affiliation(s)
- Shawn Kulakowski
- Joint BioEnergy Institute, Emeryville, CA 94608, USA; Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Deepanwita Banerjee
- Joint BioEnergy Institute, Emeryville, CA 94608, USA; Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Corinne D Scown
- Joint BioEnergy Institute, Emeryville, CA 94608, USA; Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Energy Analysis and Environmental Impacts Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Aindrila Mukhopadhyay
- Joint BioEnergy Institute, Emeryville, CA 94608, USA; Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Environmental Genomics & Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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3
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Zhao J, Sun X, Mao Z, Zheng Y, Geng Z, Zhang Y, Ma H, Wang Z. Independent component analysis of Corynebacterium glutamicum transcriptomes reveals its transcriptional regulatory network. Microbiol Res 2023; 276:127485. [PMID: 37683565 DOI: 10.1016/j.micres.2023.127485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/28/2023] [Accepted: 08/29/2023] [Indexed: 09/10/2023]
Abstract
Gene expression in bacteria is regulated by multiple transcription factors. Clarifying the regulation mechanism of gene expression is necessary to understand bacterial physiological activities. To further understand the structure of the transcriptional regulatory network of Corynebacterium glutamicum, we applied independent component analysis, an unsupervised machine learning algorithm, to the high-quality C. glutamicum gene expression profile which includes 263 samples from 29 independent projects. We obtained 87 robust independent regulatory modules (iModulons). These iModulons explain 76.7% of the variance in the expression profile and constitute the quantitative transcriptional regulatory network of C. glutamicum. By analyzing the constituent genes in iModulons, we identified potential targets for 20 transcription factors. We also captured the changes in iModulon activities under different growth rates and dissolved oxygen concentrations, demonstrating the ability of iModulons to comprehensively interpret transcriptional responses to environmental changes. In summary, this study provides a genome-scale quantitative transcriptional regulatory network for C. glutamicum and informs future research on complex changes in the transcriptome.
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Affiliation(s)
- Jianxiao Zhao
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China; SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Biodesign Center, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Xi Sun
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China; SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Zhitao Mao
- Biodesign Center, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
| | - Yangyang Zheng
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China; SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Zhouxiao Geng
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China; SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yuhan Zhang
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China; SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Hongwu Ma
- Biodesign Center, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China; National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China.
| | - Zhiwen Wang
- Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China; SynBio Research Platform, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
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4
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Rehman A, Di Benedetto G, Bird JK, Dabene V, Vadakumchery L, May A, Schyns G, Sybesma W, Mak TN. Development of a workflow for the selection, identification and optimization of lactic acid bacteria with high γ-aminobutyric acid production. Sci Rep 2023; 13:13663. [PMID: 37608211 PMCID: PMC10444875 DOI: 10.1038/s41598-023-40808-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 08/16/2023] [Indexed: 08/24/2023] Open
Abstract
Lactic acid bacteria produce γ-aminobutyric acid (GABA) as an acid stress response. GABA is a neurotransmitter that may improve sleep and resilience to mental stress. This study focused on the selection, identification and optimization of a bacterial strain with high GABA production, for development as a probiotic supplement. The scientific literature and an industry database were searched for probiotics and potential GABA producers. In silico screening was conducted to identify genes involved in GABA production. Subsequently, 17 candidates were screened for in vitro GABA production using thin layer chromatography, which identified three candidate probiotic strains Levilactobacillus brevis DSM 20054, Lactococcus lactis DS75843and Bifidobacterium adolescentis DSM 24849 as producing GABA. Two biosensors capable of detecting GABA were developed: 1. a transcription factor-based biosensor characterized by the interaction with the transcriptional regulator GabR was developed in Corynebacterium glutamicum; and 2. a growth factor-based biosensor was built in Escherichia coli, which used auxotrophic complementation by expressing 4-aminobutyrate transaminase (GABA-T) that transfers the GABA amino group to pyruvate, hereby forming alanine. Consequently, the feasibility of developing a workflow based on co-culture with producer strains and a biosensor was tested. The three GABA producers were identified and the biosensors were encapsulated in nanoliter reactors (NLRs) as alginate beads in defined gut-like conditions. The E. coli growth factor-based biosensor was able to detect changes in GABA concentrations in liquid culture and under gut-like conditions. L. brevis and L. lactis were successfully encapsulated in the NLRs and showed growth under miniaturized intestinal conditions.
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Affiliation(s)
| | | | - Julia K Bird
- Bird Scientific Writing, Wassenaar, The Netherlands
| | | | - Lisa Vadakumchery
- Institute of Microbiology, Eidgenössische Technische Hochschule (ETH) Zürich, Zurich, Switzerland
| | - Ali May
- dsm-firmenich, Biodata and Translational Sciences, Delft, The Netherlands
| | | | - Wilbert Sybesma
- dsm-firmenich, Kaiseraugst, Switzerland
- Microbiome Solutions GmbH, Münsingen, Switzerland
| | - Tim N Mak
- dsm-firmenich, Kaiseraugst, Switzerland.
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5
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Tenhaef N, Hermann A, Müller MF, Görtz J, Marienhagen J, Oldiges M, Wiechert W, Bott M, Jupke A, Hartmann L, Herres-Pawlis S, Noack S. From Microbial Succinic Acid Production to Polybutylene Bio‐Succinate Synthesis. CHEM-ING-TECH 2023. [DOI: 10.1002/cite.202200163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- Niklas Tenhaef
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
| | - Alina Hermann
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Institute of Inorganic Chemistry 52074 Aachen Germany
| | - Moritz Fabian Müller
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
| | - Jonas Görtz
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Aachener Verfahrenstechnik – Fluid Process Engineering (AVT.FVT) 52074 Aachen Germany
| | - Jan Marienhagen
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Institute of Biotechnology Worringer Weg 3 52074 Aachen Germany
| | - Marco Oldiges
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Institute of Biotechnology Worringer Weg 3 52074 Aachen Germany
| | - Wolfgang Wiechert
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Computational Systems Biotechnology (AVT.CSB) 52074 Aachen Germany
| | - Michael Bott
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
| | - Andreas Jupke
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Aachener Verfahrenstechnik – Fluid Process Engineering (AVT.FVT) 52074 Aachen Germany
| | - Laura Hartmann
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- Heinrich Heine University Düsseldorf Institute of Organic and Macromolecular Chemistry 40225 Düsseldorf Germany
| | - Sonja Herres-Pawlis
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
- RWTH Aachen University Institute of Inorganic Chemistry 52074 Aachen Germany
| | - Stephan Noack
- Forschungszentrum Jülich GmbH Institute of Bio- and Geosciences, IBG-1: Biotechnology 52425 Jülich Germany
- Forschungszentrum Jülich GmbH Bioeconomy Science Center (BioSC) 52425 Jülich Germany
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6
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Sheremetieva M, Anufriev K, Khlebodarova T, Kolchanov N, Yanenko A. Rational metabolic engineering of Corynebacterium glutamicum to create a producer of L-valine. Vavilovskii Zhurnal Genet Selektsii 2022; 26:743-757. [PMID: 36694718 PMCID: PMC9834717 DOI: 10.18699/vjgb-22-90] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 10/26/2022] [Accepted: 10/26/2022] [Indexed: 01/06/2023] Open
Abstract
L-Valine is one of the nine amino acids that cannot be synthesized de novo by higher organisms and must come from food. This amino acid not only serves as a building block for proteins, but also regulates protein and energy metabolism and participates in neurotransmission. L-Valine is used in the food and pharmaceutical industries, medicine and cosmetics, but primarily as an animal feed additive. Adding L-valine to feed, alone or mixed with other essential amino acids, allows for feeds with lower crude protein content, increases the quality and quantity of pig meat and broiler chicken meat, as well as improves reproductive functions of farm animals. Despite the fact that the market for L-valine is constantly growing, this amino acid is not yet produced in our country. In modern conditions, the creation of strains-producers and organization of L-valine production are especially relevant for Russia. One of the basic microorganisms most commonly used for the creation of amino acid producers, along with Escherichia coli, is the soil bacterium Corynebacterium glutamicum. This review is devoted to the analysis of the main strategies for the development of L- valine producers based on C. glutamicum. Various aspects of L-valine biosynthesis in C. glutamicum are reviewed: process biochemistry, stoichiometry and regulation, enzymes and their corresponding genes, export and import systems, and the relationship of L-valine biosynthesis with central cell metabolism. Key genetic elements for the creation of C. glutamicum-based strains-producers are identified. The use of metabolic engineering to enhance L-valine biosynthesis reactions and to reduce the formation of byproducts is described. The prospects for improving strains in terms of their productivity and technological characteristics are shown. The information presented in the review can be used in the production of producers of other amino acids with a branched side chain, namely L-leucine and L-isoleucine, as well as D-pantothenate.
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Affiliation(s)
| | - K.E. Anufriev
- NRC “Kurchatov Institute”, Kurchatov Genomic Center, Moscow, Russia
| | - T.M. Khlebodarova
- Institute of Cytology and Genetics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, RussiaKurchatov Genomic Center of ICG SB RAS, Novosibirsk, Russia
| | - N.A. Kolchanov
- Institute of Cytology and Genetics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, RussiaKurchatov Genomic Center of ICG SB RAS, Novosibirsk, Russia
| | - A.S. Yanenko
- NRC “Kurchatov Institute”, Kurchatov Genomic Center, Moscow, Russia
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7
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Golubyatnikov V, Akinshin A, Ayupova N, Minushkina L. Stratifications and foliations in phase portraits of gene network models. Vavilovskii Zhurnal Genet Selektsii 2022; 26:758-764. [PMID: 36694713 PMCID: PMC9837163 DOI: 10.18699/vjgb-22-91] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/20/2022] [Accepted: 09/21/2022] [Indexed: 01/06/2023] Open
Abstract
Periodic processes of gene network functioning are described with good precision by periodic trajectories (limit cycles) of multidimensional systems of kinetic-type differential equations. In the literature, such systems are often called dynamical, they are composed according to schemes of positive and negative feedback between components of these networks. The variables in these equations describe concentrations of these components as functions of time. In the preparation of numerical experiments with such mathematical models, it is useful to start with studies of qualitative behavior of ensembles of trajectories of the corresponding dynamical systems, in particular, to estimate the highest likelihood domain of the initial data, to solve inverse problems of parameter identification, to list the equilibrium points and their characteristics, to localize cycles in the phase portraits, to construct stratification of the phase portraits to subdomains with different qualities of trajectory behavior, etc. Such an à priori geometric analysis of the dynamical systems is quite analogous to the basic section "Investigation of functions and plot of their graphs" of Calculus, where the methods of qualitative studies of shapes of curves determined by equations are exposed. In the present paper, we construct ensembles of trajectories in phase portraits of some dynamical systems. These ensembles are 2-dimensional surfaces invariant with respect to shifts along the trajectories. This is analogous to classical construction in analytic mechanics, i. e. the level surfaces of motion integrals (energy, kinetic moment, etc.). Such surfaces compose foliations in phase portraits of dynamical systems of Hamiltonian mechanics. In contrast with this classical mechanical case, the foliations considered in this paper have singularities: all their leaves have a non-empty intersection, they contain limit cycles on their boundaries. Description of the phase portraits of these systems at the level of their stratifications, and that of ensembles of trajectories allows one to construct more realistic gene network models on the basis of methods of statistical physics and the theory of stochastic differential equations.
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Affiliation(s)
- V.P. Golubyatnikov
- Sobolev Institute of Mathematics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, RussiaNovosibirsk State University, Novosibirsk, Russia
| | - A.A. Akinshin
- Huawei Russian Research Institute, St. Petersburg, Russia
| | - N.B. Ayupova
- Sobolev Institute of Mathematics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, RussiaNovosibirsk State University, Novosibirsk, Russia
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8
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Briki A, Olmos E, Delaunay S, Fournier F. Generalized modelling of effect of oxygenation and glucose concentration on Corynebacterium glutamicum growth and production kinetics. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Banerjee D, Eng T, Sasaki Y, Srinivasan A, Oka A, Herbert RA, Trinh J, Singan VR, Sun N, Putnam D, Scown CD, Simmons B, Mukhopadhyay A. Genomics Characterization of an Engineered Corynebacterium glutamicum in Bioreactor Cultivation Under Ionic Liquid Stress. Front Bioeng Biotechnol 2021; 9:766674. [PMID: 34869279 PMCID: PMC8637627 DOI: 10.3389/fbioe.2021.766674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 10/27/2021] [Indexed: 12/04/2022] Open
Abstract
Corynebacterium glutamicum is an ideal microbial chassis for production of valuable bioproducts including amino acids and next generation biofuels. Here we resequence engineered isopentenol (IP) producing C. glutamicum BRC-JBEI 1.1.2 strain and assess differential transcriptional profiles using RNA sequencing under industrially relevant conditions including scale transition and compare the presence vs absence of an ionic liquid, cholinium lysinate ([Ch][Lys]). Analysis of the scale transition from shake flask to bioreactor with transcriptomics identified a distinct pattern of metabolic and regulatory responses needed for growth in this industrial format. These differential changes in gene expression corroborate altered accumulation of organic acids and bioproducts, including succinate, acetate, and acetoin that occur when cells are grown in the presence of 50 mM [Ch][Lys] in the stirred-tank reactor. This new genome assembly and differential expression analysis of cells grown in a stirred tank bioreactor clarify the cell response of an C. glutamicum strain engineered to produce IP.
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Affiliation(s)
- Deepanwita Banerjee
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Thomas Eng
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Yusuke Sasaki
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Aparajitha Srinivasan
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Asun Oka
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States.,Advanced Biofuels and Bioproducts Process Development Unit, Lawrence Berkeley National Laboratory, Emeryville, CA, United States
| | - Robin A Herbert
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Jessica Trinh
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Vasanth R Singan
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States.,Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Ning Sun
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States.,Advanced Biofuels and Bioproducts Process Development Unit, Lawrence Berkeley National Laboratory, Emeryville, CA, United States
| | - Dan Putnam
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Corinne D Scown
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Energy Analysis and Environmental Impacts Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Blake Simmons
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Aindrila Mukhopadhyay
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA, United States.,Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
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10
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Demling P, Ankenbauer A, Klein B, Noack S, Tiso T, Takors R, Blank LM. Pseudomonas putida KT2440 endures temporary oxygen limitations. Biotechnol Bioeng 2021; 118:4735-4750. [PMID: 34506651 DOI: 10.1002/bit.27938] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 08/31/2021] [Accepted: 09/01/2021] [Indexed: 01/26/2023]
Abstract
The obligate aerobic nature of Pseudomonas putida, one of the most prominent whole-cell biocatalysts emerging for industrial bioprocesses, questions its ability to be cultivated in large-scale bioreactors, which exhibit zones of low dissolved oxygen tension. P. putida KT2440 was repeatedly subjected to temporary oxygen limitations in scale-down approaches to assess the effect on growth and an exemplary production of rhamnolipids. At those conditions, the growth and production of P. putida KT2440 were decelerated compared to well-aerated reference cultivations, but remarkably, final biomass and rhamnolipid titers were similar. The robust growth behavior was confirmed across different cultivation systems, media compositions, and laboratories, even when P. putida KT2440 was repeatedly exposed to dual carbon and oxygen starvation. Quantification of the nucleotides ATP, ADP, and AMP revealed a decrease of intracellular ATP concentrations with increasing duration of oxygen starvation, which can, however, be restored when re-supplied with oxygen. Only small changes in the proteome were detected when cells encountered oscillations in dissolved oxygen tensions. Concluding, P. putida KT2440 appears to be able to cope with repeated oxygen limitations as they occur in large-scale bioreactors, affirming its outstanding suitability as a whole-cell biocatalyst for industrial-scale bioprocesses.
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Affiliation(s)
- Philipp Demling
- Institute of Applied Microbiology (iAMB), Aachen Biology and Biotechnology (ABBt), RWTH Aachen University, Aachen, Germany
| | - Andreas Ankenbauer
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Bianca Klein
- Institute of Bio- and Geosciences (IBG-1): Biotechnology, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Stephan Noack
- Institute of Bio- and Geosciences (IBG-1): Biotechnology, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Till Tiso
- Institute of Applied Microbiology (iAMB), Aachen Biology and Biotechnology (ABBt), RWTH Aachen University, Aachen, Germany
| | - Ralf Takors
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Lars M Blank
- Institute of Applied Microbiology (iAMB), Aachen Biology and Biotechnology (ABBt), RWTH Aachen University, Aachen, Germany
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11
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Tsuge Y, Yamaguchi A. Physiological characteristics of Corynebacterium glutamicum as a cell factory under anaerobic conditions. Appl Microbiol Biotechnol 2021; 105:6173-6181. [PMID: 34402937 DOI: 10.1007/s00253-021-11474-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 07/14/2021] [Accepted: 07/15/2021] [Indexed: 12/25/2022]
Abstract
Corynebacterium glutamicum, a gram-positive and facultative anaerobic bacterium, is widely used for the industrial production of amino acids, such as L-glutamate and L-lysine. C. glutamicum grows and produces amino acids under aerobic conditions. When restricted under anaerobic conditions, it produces organic acids, such as L-lactate and succinate, through metabolic shift. With the increasing threat of global warming, these organic acids have drawn considerable attention as bio-based plastic monomers. In addition to the organic acids, the anaerobic bioprocess is also used to produce other value-added compounds, including isobutanol, ethanol, 3-methyl-1-butanol, 2,3-butanediol, L-alanine, and L-valine. Therefore, C. glutamicum is now a versatile cell factory for producing a wide variety of useful chemicals under both aerobic and anaerobic conditions. The growth and metabolism of the bacterium depend on the oxygen levels, which modulate the rearrangement of the carbon flux by reprogramming gene expression patterns and intracellular redox states. Anaerobic cell growth and L-lysine production as well as aerobic succinate production have been demonstrated by engineering the metabolic pathways or supplying a terminal electron acceptor instead of oxygen. In this review, we discuss the physiological and metabolic changes in C. glutamicum associated with its application as a cell factory under different oxygen states. Physiological switching in bacteria is initiated with the sensing of oxygen availability. While such a sensor has not been identified in C. glutamicum yet, the molecular mechanism for oxygen sensing in related bacteria is also discussed. KEY POINTS: • C. glutamicum produces a wide variety of useful compounds under anaerobic conditions. • C. glutamicum is a versatile cell factory under both aerobic and anaerobic conditions. • Metabolic fate can be overcome by engineering metabolic pathways.
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Affiliation(s)
- Yota Tsuge
- Institute for Frontier Science Initiative, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
| | - Akira Yamaguchi
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan
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12
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Physiological Response of Corynebacterium glutamicum to Indole. Microorganisms 2020; 8:microorganisms8121945. [PMID: 33302489 PMCID: PMC7764795 DOI: 10.3390/microorganisms8121945] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 12/04/2020] [Accepted: 12/05/2020] [Indexed: 12/20/2022] Open
Abstract
The aromatic heterocyclic compound indole is widely spread in nature. Due to its floral odor indole finds application in dairy, flavor, and fragrance products. Indole is an inter- and intracellular signaling molecule influencing cell division, sporulation, or virulence in some bacteria that synthesize it from tryptophan by tryptophanase. Corynebacterium glutamicum that is used for the industrial production of amino acids including tryptophan lacks tryptophanase. To test if indole is metabolized by C. glutamicum or has a regulatory role, the physiological response to indole by this bacterium was studied. As shown by RNAseq analysis, indole, which inhibited growth at low concentrations, increased expression of genes involved in the metabolism of iron, copper, and aromatic compounds. In part, this may be due to iron reduction as indole was shown to reduce Fe3+ to Fe2+ in the culture medium. Mutants with improved tolerance to indole were selected by adaptive laboratory evolution. Among the mutations identified by genome sequencing, mutations in three transcriptional regulator genes were demonstrated to be causal for increased indole tolerance. These code for the regulator of iron homeostasis DtxR, the regulator of oxidative stress response RosR, and the hitherto uncharacterized Cg3388. Gel mobility shift analysis revealed that Cg3388 binds to the intergenic region between its own gene and the iolT2-rhcM2D2 operon encoding inositol uptake system IolT2, maleylacetate reductase, and catechol 1,2-dioxygenase. Increased RNA levels of rhcM2 in a cg3388 deletion strain indicated that Cg3388 acts as repressor. Indole, hydroquinone, and 1,2,4-trihydroxybenzene may function as inducers of the iolT2-rhcM2D2 operon in vivo as they interfered with DNA binding of Cg3388 at physiological concentrations in vitro. Cg3388 was named IhtR.
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13
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The Industrial Organism Corynebacterium glutamicum Requires Mycothiol as Antioxidant to Resist Against Oxidative Stress in Bioreactor Cultivations. Antioxidants (Basel) 2020; 9:antiox9100969. [PMID: 33050339 PMCID: PMC7599745 DOI: 10.3390/antiox9100969] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 09/28/2020] [Accepted: 09/29/2020] [Indexed: 12/27/2022] Open
Abstract
In aerobic environments, bacteria are exposed to reactive oxygen species (ROS). To avoid an excess of ROS, microorganisms are equipped with powerful enzymatic and non-enzymatic antioxidants. Corynebacterium glutamicum, a widely used industrial platform organism, uses mycothiol (MSH) as major low molecular weight (LMW) thiol and non-enzymatic antioxidant. In aerobic bioreactor cultivations, C. glutamicum becomes exposed to oxygen concentrations surpassing the air saturation, which are supposed to constitute a challenge for the intracellular MSH redox balance. In this study, the role of MSH was investigated at different oxygen levels (pO2) in bioreactor cultivations in C. glutamicum. Despite the presence of other highly efficient antioxidant systems, such as catalase, the MSH deficient ΔmshC mutant was impaired in growth in bioreactor experiments performed at pO2 values of 30%. At a pO2 level of 20%, this growth defect was abolished, indicating a high susceptibility of the MSH-deficient mutant towards elevated oxygen concentrations. Bioreactor experiments with C. glutamicum expressing the Mrx1-roGFP2 redox biosensor revealed a strong oxidative shift in the MSH redox potential (EMSH) at pO2 values above 20%. This indicates that the LMW thiol MSH is an essential antioxidant to maintain the robustness and industrial performance of C. glutamicum during aerobic fermentation processes.
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14
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Siebert D, Busche T, Metz AY, Smaili M, Queck BAW, Kalinowski J, Eikmanns BJ. Genetic Engineering of Oligotropha carboxidovorans Strain OM5-A Promising Candidate for the Aerobic Utilization of Synthesis Gas. ACS Synth Biol 2020; 9:1426-1440. [PMID: 32379961 DOI: 10.1021/acssynbio.0c00098] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Due to climate change and worldwide pollution, development of highly sustainable routes for industrial production of basic and specialty chemicals is critical nowadays. One possible approach is the use of CO2- and CO-utilizing microorganisms in biotechnological processes to produce value-added compounds from synthesis gas (mixtures of CO2, CO, and H2) or from C1-containing industrial waste gases. Such syngas fermentation processes have already been established, e.g., biofuel production using strictly anaerobic acetogenic bacteria. However, aerobic processes may be favorable for the formation of more costly (ATP-intensive) products. Oligotropha carboxidovorans strain OM5 is an aerobic carboxidotrophic bacterium and potentially a promising candidate for such processes. We here performed RNA-Seq analysis comparing cells of this organism grown heterotrophically with acetate or autotrophically with CO2, CO, and H2 as carbon and energy source and found a variety of chromosomally and of native plasmid-encoded genes to be highly differentially expressed. In particular, genes and gene clusters encoding proteins required for autotrophic growth (CO2 fixation via Calvin-Benson-Bassham cycle), for CO metabolism (CO dehydrogenase), and for H2 utilization (hydrogenase), all located on megaplasmid pHCG3, were much higher expressed during autotrophic growth with synthesis gas. Furthermore, we successfully established reproducible transformation of O. carboxidovorans via electroporation and developed gene deletion and gene exchange protocols via two-step recombination, enabling inducible and stable expression of heterologous genes as well as construction of defined mutants of this organism. Thus, this study marks an important step toward metabolic engineering of O. carboxidovorans and effective utilization of C1-containing gases with this organism.
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Affiliation(s)
- Daniel Siebert
- Institute of Microbiology and Biotechnology, Ulm University, 89069 Ulm, Germany
- Microbial Biotechnology, Campus Straubing for Biotechnology and Sustainability, Technical University of Munich, 94315 Straubing, Germany
| | - Tobias Busche
- Center for Biotechnology, Bielefeld University, Universitätsstraße 27, 33615 Bielefeld, Germany
| | - Aline Y. Metz
- Institute of Microbiology and Biotechnology, Ulm University, 89069 Ulm, Germany
| | - Medina Smaili
- Institute of Microbiology and Biotechnology, Ulm University, 89069 Ulm, Germany
| | - Bastian A. W. Queck
- Institute of Microbiology and Biotechnology, Ulm University, 89069 Ulm, Germany
| | - Jörn Kalinowski
- Center for Biotechnology, Bielefeld University, Universitätsstraße 27, 33615 Bielefeld, Germany
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15
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Briki A, Kaboré K, Olmos E, Bosselaar S, Blanchard F, Fick M, Guedon E, Fournier F, Delaunay S. Corynebacterium glutamicum, a natural overproducer of succinic acid? Eng Life Sci 2020; 20:205-215. [PMID: 32874184 PMCID: PMC7447883 DOI: 10.1002/elsc.201900141] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 01/03/2020] [Accepted: 01/03/2020] [Indexed: 01/09/2023] Open
Abstract
Corynebacterium glutamicum is well known as an important industrial amino acid producer. For a few years, its ability to produce organic acids, under micro-aerobic or anaerobic conditions was demonstrated. This study is focused on the identification of the culture parameters influencing the organic acids production and, in particular, the succinate production, by this bacterium. Corynebacterium glutamicum 2262, used throughout this study, was a wild-type strain, which was not genetically designed for the production of succinate. The oxygenation level and the residual glucose concentration appeared as two critical parameters for the organic acids production. The maximal succinate concentration (4.9 g L-1) corresponded to the lower kLa value of 5 h-1. Above 5 h-1, a transient accumulation of the succinate was observed. Interestingly, the stop in the succinate production was concomitant with a lower threshold glucose concentration of 9 g L-1. Taking into account this threshold, a fed-batch culture was performed to optimize the succinate production with C. glutamicum 2262. The results showed that this wild-type strain was able to produce 93.6 g L-1 of succinate, which is one of the highest concentration reported in the literature.
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Affiliation(s)
- Amani Briki
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Karim Kaboré
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Eric Olmos
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Sabine Bosselaar
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Fabrice Blanchard
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Michel Fick
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Emmanuel Guedon
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Frantz Fournier
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
| | - Stéphane Delaunay
- Laboratoire Réactions et Génie des ProcédésCNRSVandoeuvre CedexFrance
- Laboratoire Réactions et Génie des ProcédésUniversité de LorraineVandoeuvre CedexFrance
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16
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Graf M, Haas T, Müller F, Buchmann A, Harm-Bekbenbetova J, Freund A, Nieß A, Persicke M, Kalinowski J, Blombach B, Takors R. Continuous Adaptive Evolution of a Fast-Growing Corynebacterium glutamicum Strain Independent of Protocatechuate. Front Microbiol 2019; 10:1648. [PMID: 31447790 PMCID: PMC6691914 DOI: 10.3389/fmicb.2019.01648] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Accepted: 07/03/2019] [Indexed: 12/30/2022] Open
Abstract
Corynebacterium glutamicum is a commonly applied host for the industrial production of amino acids. While valued for its robustness, it is somewhat inferior to competing strains such as Escherichia coli because of the relatively low growth rate of 0.40 h-1 in synthetic, industrial media. Accordingly, adaptive laboratory evolution (ALE) experiments were performed in continuous cultivation mode to select for a growth-improved host. To ensure industrial attractiveness, this ALE study aimed at a reduction of dependency on costly growth-boosting additives such as protocatechuate (PCA) or complex media supplements. Consequently, double selection pressures were installed consisting of a steady increase in growth rate demands and a parallel reduction of complex medium fractions. Selection yielded C. glutamicum EVO5 achieving 0.54 h-1 and 1.03 gGlc gCDW -1 h-1 in minimal medium without abovementioned supplements. Sequencing revealed 10 prominent mutations, three of them in key regulator genes.
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Affiliation(s)
- Michaela Graf
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Thorsten Haas
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Felix Müller
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Anina Buchmann
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | | | - Andreas Freund
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Alexander Nieß
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
| | - Marcus Persicke
- Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany
| | - Jörn Kalinowski
- Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany
| | - Bastian Blombach
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
- Microbial Biotechnology, Campus Straubing for Biotechnology and Sustainability, Technical University of Munich, Straubing, Germany
| | - Ralf Takors
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
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17
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Conrady M, Lemoine A, Limberg MH, Oldiges M, Neubauer P, Junne S. Carboxylic acid consumption and production by Corynebacterium glutamicum. Biotechnol Prog 2019; 35:e2804. [PMID: 30851150 DOI: 10.1002/btpr.2804] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 03/01/2019] [Accepted: 03/05/2019] [Indexed: 11/07/2022]
Abstract
Corynebacterium glutamicum is well-known as an industrial workhorse, most notably for its use in the bulk production of amino acids in the feed and food sector. Previous studies of the effect of gradients in scale-down reactors with complex media disclosed an accumulation of several carboxylic acids and a parallel decrease of growth and product accumulation. This study, therefore, addresses the impact of carboxylic acids, for example, acetate and l-lactate, on the cultivation of the cadaverine producing strain C. glutamicum DM1945Δact3:Ptuf -ldcCopt and their potential role in scale up related performance losses. A fluctuating power input in shake flask and stirred tank cultivations with mineral salt was applied to mimic discontinuous oxygen availability. Results demonstrate, whenever sufficient oxygen was available, C. glutamicum recovered from previously occurring stressful conditions like an oxygen limiting phase. Reassimilation of acids was detected simultaneously. In cultures, which were supplemented with either acetate or l-lactate, a rapid cometabolization of both acids in presence of glucose was observed, showing conversion rates of 7.8 and 3.8 mmol gcell dry weight -1 hr-1 , respectively. Uptake of these acids was accompanied by increased oxygen consumption. Proteins related to oxidative stress response, glycogen synthesis, and the main carbon metabolism were found in altered concentrations under oscillatory cultivation conditions. (Proteomics data are available via ProteomeXchange with identifier PXD012760). Virtually no impact on growth or product formation was observed. We conclude that the reduced growth and product formation in scale-down cultivations when complex media was used is not caused by the accumulation of carboxylic acids.
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Affiliation(s)
- Marius Conrady
- Department of Biotechnology, Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Anja Lemoine
- Department of Biotechnology, Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Michael H Limberg
- Research Centre Juelich, IBG-1-Institute of Bio- and Geosciences, Biotechnology, Juelich, Germany.,Department of Molecular Biotechnology, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Aachen, Germany
| | - Marco Oldiges
- Research Centre Juelich, IBG-1-Institute of Bio- and Geosciences, Biotechnology, Juelich, Germany
| | - Peter Neubauer
- Department of Biotechnology, Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Stefan Junne
- Department of Biotechnology, Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
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