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de la Cruz M, Kunert F, Taymaz-Nikerel H, Sigala JC, Gosset G, Büchs J, Lara AR. Increasing the Pentose Phosphate Pathway Flux to Improve Plasmid DNA Production in Engineered E. coli. Microorganisms 2024; 12:150. [PMID: 38257977 PMCID: PMC10820320 DOI: 10.3390/microorganisms12010150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/03/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
The demand of plasmid DNA (pDNA) as a key element for gene therapy products, as well as mRNA and DNA vaccines, is increasing together with the need for more efficient production processes. An engineered E. coli strain lacking the phosphotransferase system and the pyruvate kinase A gene has been shown to produce more pDNA than its parental strain. With the aim of improving pDNA production in the engineered strain, several strategies to increase the flux to the pentose phosphate pathway (PPP) were evaluated. The simultaneous consumption of glucose and glycerol was a simple way to increase the growth rate, pDNA production rate, and supercoiled fraction (SCF). The overexpression of key genes from the PPP also improved pDNA production in glucose, but not in mixtures of glucose and glycerol. Particularly, the gene coding for the glucose 6-phosphate dehydrogenase (G6PDH) strongly improved the SCF, growth rate, and pDNA production rate. A linear relationship between the G6PDH activity and pDNA yield was found. A higher flux through the PPP was confirmed by flux balance analysis, which also estimates relevant differences in fluxes of the tricarboxylic acid cycle. These results are useful for developing further cell engineering strategies to increase pDNA production and quality.
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Affiliation(s)
- Mitzi de la Cruz
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana, Mexico City 05348, Mexico
| | - Flavio Kunert
- Chair of Biochemical Engineering (AVT.BioVT), RWTH Aachen University, 52074 Aachen, Germany
| | - Hilal Taymaz-Nikerel
- Department of Genetics and Bioengineering, Istanbul Bilgi University, 34060 Istanbul, Turkey
| | - Juan-Carlos Sigala
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana, Mexico City 05348, Mexico
| | - Guillermo Gosset
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca 62210, Mexico
| | - Jochen Büchs
- Chair of Biochemical Engineering (AVT.BioVT), RWTH Aachen University, 52074 Aachen, Germany
| | - Alvaro R. Lara
- Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus, Denmark
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2
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Gotsmy M, Strobl F, Weiß F, Gruber P, Kraus B, Mairhofer J, Zanghellini J. Sulfate limitation increases specific plasmid DNA yield and productivity in E. coli fed-batch processes. Microb Cell Fact 2023; 22:242. [PMID: 38017439 PMCID: PMC10685491 DOI: 10.1186/s12934-023-02248-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 11/11/2023] [Indexed: 11/30/2023] Open
Abstract
Plasmid DNA (pDNA) is a key biotechnological product whose importance became apparent in the last years due to its role as a raw material in the messenger ribonucleic acid (mRNA) vaccine manufacturing process. In pharmaceutical production processes, cells need to grow in the defined medium in order to guarantee the highest standards of quality and repeatability. However, often these requirements result in low product titer, productivity, and yield. In this study, we used constraint-based metabolic modeling to optimize the average volumetric productivity of pDNA production in a fed-batch process. We identified a set of 13 nutrients in the growth medium that are essential for cell growth but not for pDNA replication. When these nutrients are depleted in the medium, cell growth is stalled and pDNA production is increased, raising the specific and volumetric yield and productivity. To exploit this effect we designed a three-stage process (1. batch, 2. fed-batch with cell growth, 3. fed-batch without cell growth). The transition between stage 2 and 3 is induced by sulfate starvation. Its onset can be easily controlled via the initial concentration of sulfate in the medium. We validated the decoupling behavior of sulfate and assessed pDNA quality attributes (supercoiled pDNA content) in E. coli with lab-scale bioreactor cultivations. The results showed an increase in supercoiled pDNA to biomass yield by 33% and an increase of supercoiled pDNA volumetric productivity by 13 % upon limitation of sulfate. In conclusion, even for routinely manufactured biotechnological products such as pDNA, simple changes in the growth medium can significantly improve the yield and quality.
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Affiliation(s)
- Mathias Gotsmy
- Department of Analytical Chemistry, University of Vienna, Vienna, 1090, Austria
- Doctorate School of Chemistry, University of Vienna, Vienna, 1090, Austria
| | | | | | - Petra Gruber
- Baxalta Innovations GmbH, A Part of Takeda Companies, Orth an der Donau, 2304, Austria
| | - Barbara Kraus
- Baxalta Innovations GmbH, A Part of Takeda Companies, Orth an der Donau, 2304, Austria
| | | | - Jürgen Zanghellini
- Department of Analytical Chemistry, University of Vienna, Vienna, 1090, Austria.
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3
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Kager J, Bartlechner J, Herwig C, Jakubek S. Direct control of recombinant protein production rates in E. coli fed-batch processes by nonlinear feedback linearization. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.03.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Zalai D, Kopp J, Kozma B, Küchler M, Herwig C, Kager J. Microbial technologies for biotherapeutics production: Key tools for advanced biopharmaceutical process development and control. DRUG DISCOVERY TODAY. TECHNOLOGIES 2021; 38:9-24. [PMID: 34895644 DOI: 10.1016/j.ddtec.2021.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 03/14/2021] [Accepted: 04/06/2021] [Indexed: 12/26/2022]
Abstract
Current trends in the biopharmaceutical market such as the diversification of therapies as well as the increasing time-to-market pressure will trigger the rethinking of bioprocess development and production approaches. Thereby, the importance of development time and manufacturing costs will increase, especially for microbial production. In the present review, we investigate three technological approaches which, to our opinion, will play a key role in the future of biopharmaceutical production. The first cornerstone of process development is the generation and effective utilization of platform knowledge. Building processes on well understood microbial and technological platforms allows to accelerate early-stage bioprocess development and to better condense this knowledge into multi-purpose technologies and applicable mathematical models. Second, the application of verified scale down systems and in silico models for process design and characterization will reduce the required number of large scale batches before dossier submission. Third, the broader availability of mathematical process models and the improvement of process analytical technologies will increase the applicability and acceptance of advanced control and process automation in the manufacturing scale. This will reduce process failure rates and subsequently cost of goods. Along these three aspects we give an overview of recently developed key tools and their potential integration into bioprocess development strategies.
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Affiliation(s)
- Denes Zalai
- Richter-Helm BioLogics GmbH & Co. KG, Suhrenkamp 59, 22335 Hamburg, Germany.
| | - Julian Kopp
- Research Division Biochemical Engineering, Institute of Chemical Environmental and Bioscience Engineering, Vienna University of Technology, Vienna, Austria
| | - Bence Kozma
- Research Division Biochemical Engineering, Institute of Chemical Environmental and Bioscience Engineering, Vienna University of Technology, Vienna, Austria
| | - Michael Küchler
- Richter-Helm BioLogics GmbH & Co. KG, Suhrenkamp 59, 22335 Hamburg, Germany
| | - Christoph Herwig
- Research Division Biochemical Engineering, Institute of Chemical Environmental and Bioscience Engineering, Vienna University of Technology, Vienna, Austria; Competence Center CHASE GmbH, Altenbergerstraße 69, 4040 Linz, Austria
| | - Julian Kager
- Research Division Biochemical Engineering, Institute of Chemical Environmental and Bioscience Engineering, Vienna University of Technology, Vienna, Austria
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5
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Enhancing microaerobic plasmid DNA production by chromosomal expression of Vitreoscilla hemoglobin in E. coli. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2020.107862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Shemer B, Shpigel E, Glozman A, Yagur-Kroll S, Kabessa Y, Agranat AJ, Belkin S. Genome-wide gene-deletion screening identifies mutations that significantly enhance explosives vapor detection by a microbial sensor. N Biotechnol 2020; 59:65-73. [PMID: 32622861 DOI: 10.1016/j.nbt.2020.06.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 12/16/2022]
Abstract
Genetically engineered microbial biosensors, capable of detecting traces of explosives residues above buried military ordnance and emitting an optical signal in response, may potentially serve for the standoff detection of buried landmines. A promising candidate for such an application is a previously reported Escherichia coli-based reporter strain that employs the yqjF gene promoter as its sensing element; however, for this sensor to be able to detect actual landmines reliably, it was necessary for its detection sensitivity and signal intensity to be enhanced. In this study, a high-throughput approach was employed to screen the effects of individual gene deletions on yqjF activation by 2,4-dinitrotoluene (DNT). Several genes were identified, the deletion of which elicited a significant enhancement of yqjF induction by DNT. The most promising of these mutations were introduced into the sensor strain, individually or in pairs, yielding a considerable increase in signal intensity and a lowering of the detection threshold. A strain harboring two of the identified mutations, ygdD and eutE, appears to be the most sensitive microbial biosensor currently described for the detection of traces of landmine explosives.
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Affiliation(s)
- Benjamin Shemer
- Department of Plant and Environmental Sciences, Institute of Life Sciences, The Hebrew University of Jerusalem, Israel
| | - Etai Shpigel
- Department of Plant and Environmental Sciences, Institute of Life Sciences, The Hebrew University of Jerusalem, Israel
| | - Anat Glozman
- Department of Plant and Environmental Sciences, Institute of Life Sciences, The Hebrew University of Jerusalem, Israel
| | - Sharon Yagur-Kroll
- Department of Plant and Environmental Sciences, Institute of Life Sciences, The Hebrew University of Jerusalem, Israel
| | - Yosssef Kabessa
- Department of Applied Physics and the Brojde Center for Innovative Engineering and Computer Science, The Hebrew University of Jerusalem, Israel
| | - Aharon J Agranat
- Department of Applied Physics and the Brojde Center for Innovative Engineering and Computer Science, The Hebrew University of Jerusalem, Israel
| | - Shimshon Belkin
- Department of Plant and Environmental Sciences, Institute of Life Sciences, The Hebrew University of Jerusalem, Israel.
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7
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Lara AR, Jaén KE, Folarin O, Keshavarz-Moore E, Büchs J. Effect of the oxygen transfer rate on oxygen-limited production of plasmid DNA by Escherichia coli. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.107303] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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8
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Jaén KE, Velázquez D, Sigala JC, Lara AR. Design of a microaerobically inducible replicon for high-yield plasmid DNA production. Biotechnol Bioeng 2019; 116:2514-2525. [PMID: 31232477 DOI: 10.1002/bit.27091] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/07/2019] [Accepted: 06/10/2019] [Indexed: 01/11/2023]
Abstract
A pUC-derived replicon inducible by oxygen limitation was designed and tested in fed-batch cultures of Escherichia coli. It included the addition of a second inducible copy of rnaII, the positive replication control element. The rnaII gene was expressed from Ptrc and cloned into pUC18 to test the hypothesis that the ratio of the positive control molecule RNAII to the negative control element, RNAI, was the determinant of plasmid copy number per chromosome (PCN). The construct was evaluated in several E. coli strains. Evaluations of the RNAII/RNAI ratio, PCN and plasmid yield normalized to biomass (YpDNA/X ) were performed and the initial hypothesis was probed. Furthermore, in high cell-density cultures in shake flasks, an outstanding amount of 126 mg/L of plasmid was produced. The microaerobically inducible plasmid was obtained by cloning the rnaII gene under the control of the oxygen-responsive Vitreoscilla stercoraria hemoglobin promoter. For this plasmid, but not for pUC18, the RNAII/RNAI ratio, PCN and YpDNA/X efficiently increased after the shift to the microaerobic regime in fed-batch cultures in a 1 L bioreactor. The YpDNA/X of the inducible plasmid reached 12 mg/g at the end of the fed-batch but the original pUC18 only reached ca. 6 mg/g. The proposed plasmid is a valuable alternative for the operation and scale-up of plasmid DNA production processes in which mass transfer limitations will not represent an issue.
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Affiliation(s)
- Karim E Jaén
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, Mexico City, Mexico
| | - Daniela Velázquez
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, Mexico City, Mexico
| | - Juan-Carlos Sigala
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, Mexico City, Mexico
| | - Alvaro R Lara
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, Mexico City, Mexico
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9
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García-Rendón A, García-Rendón A, Guzmán R, Tejeda-Mansir A. Substrate-source flexibility of an exponential-fed perfusion process to produce plasmid DNA for use as leishmaniasis vaccine. BIOTECHNOL BIOTEC EQ 2019. [DOI: 10.1080/13102818.2018.1560232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- Aurora García-Rendón
- Sciences and Engineering Graduate Program, University of Sonora, Hermosillo, Sonora, Mexico
| | - Angelica García-Rendón
- Department of Chemical Engineering and Metallurgy, University of Sonora, Hermosillo, Sonora, Mexico
| | - Roberto Guzmán
- Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA
| | - Armando Tejeda-Mansir
- Department of Scientific and Technological Research, University of Sonora, Hermosillo, Sonora, Mexico
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10
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Long J, Zhao X, Liang F, Liu N, Sun Y, Xi Y. Optimization of fermentation conditions for an Escherichia coli strain engineered using the response surface method to produce a novel therapeutic DNA vaccine for rheumatoid arthritis. J Biol Eng 2018; 12:22. [PMID: 30337953 PMCID: PMC6180442 DOI: 10.1186/s13036-018-0110-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 08/06/2018] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Fermentation condition optimization and nutrients screening are of equal importance for efficient production of plasmid DNA vaccines. This directly affects the downstream purification and final quality and yield of plasmid DNA vaccines. The present study aimed to optimize the fermentation conditions for high-throughput production of therapeutic DNA vaccine pcDNA-CCOL2A1 by engineered Escherichia coli DH5α, using the response surface method (RSM). RESULTS We hypothesized that optimized fermentation conditions significantly increase the yield of pcDNA-CCOL2A1 therapeutic DNA vaccine, a novel DNA vaccine for treating rheumatoid arthritis (RA). Single-factor analysis was performed to evaluate the optimal basal culture medium from LB, 2 × YT, TB, M9 (Glycerol) and M9 (Glucose), respectively. Thereafter, the Plackett-Burman design (PBD) was used to ascertain the three most significant factors affecting the vaccine yields, followed by the paths of steepest ascent to move to the nearest region of maximum response. Initial screening through the PBD revealed that the most key factors were peptone, mannitol, and inoculum concentration. Subsequent use of RSM was further optimized for the production of therapeutic DNA vaccine pcDNA-CCOL2A1 through Box-Behnken design (BBD). The final optimized fermentation conditions were as follows: peptone, 25.86 g/L; mannitol, 8.08 g/L; inoculum concentration, OD = 0.36. Using this statistical experimental design, the yield of therapeutic DNA vaccine pcDNA-CCOL2A1 markedly increased from 223.37 mg/L to339.32 mg/L under optimal conditions, and a 51.9% increase was observed compared with the original medium. CONCLUSIONS The present results provide a basis for further production of high-quality and high-yield therapeutic DNA vaccine pcDNA-CCOL2A1 in pilot-scale and even industrial-scale.
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Affiliation(s)
- Juan Long
- Department of Immunology and National Center for Biomedicine Analysis, Beijing 307 Hospital, No.8, Dongda Ave, Fengtai District, Beijing, 100071 People’s Republic of China
| | - Xiao Zhao
- Department of Immunology and National Center for Biomedicine Analysis, Beijing 307 Hospital, No.8, Dongda Ave, Fengtai District, Beijing, 100071 People’s Republic of China
| | - Fei Liang
- Department of Immunology and National Center for Biomedicine Analysis, Beijing 307 Hospital, No.8, Dongda Ave, Fengtai District, Beijing, 100071 People’s Republic of China
| | - Nan Liu
- Department of Immunology and National Center for Biomedicine Analysis, Beijing 307 Hospital, No.8, Dongda Ave, Fengtai District, Beijing, 100071 People’s Republic of China
| | - Yuying Sun
- Department of Immunology and National Center for Biomedicine Analysis, Beijing 307 Hospital, No.8, Dongda Ave, Fengtai District, Beijing, 100071 People’s Republic of China
| | - Yongzhi Xi
- Department of Immunology and National Center for Biomedicine Analysis, Beijing 307 Hospital, No.8, Dongda Ave, Fengtai District, Beijing, 100071 People’s Republic of China
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11
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Estimation of plasmid concentration in batch culture of Escherichia coli DH5α via simple state observer. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0478-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Developing strategies to increase plasmid DNA production in Escherichia coli DH5α using batch culture. J Biotechnol 2016; 233:66-73. [DOI: 10.1016/j.jbiotec.2016.06.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 06/22/2016] [Accepted: 06/29/2016] [Indexed: 01/25/2023]
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13
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Galindo J, Barrón BL, Lara AR. Improved production of large plasmid DNA by enzyme-controlled glucose release. ANN MICROBIOL 2016. [DOI: 10.1007/s13213-016-1218-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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14
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Enhanced plasmid DNA production by enzyme-controlled glucose release and an engineered Escherichia coli. Biotechnol Lett 2015; 38:651-7. [DOI: 10.1007/s10529-015-2017-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 12/07/2015] [Indexed: 12/17/2022]
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15
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Cortés JT, Flores N, Bolívar F, Lara AR, Ramírez OT. Physiological effects of pH gradients onEscherichia coliduring plasmid DNA production. Biotechnol Bioeng 2015; 113:598-611. [DOI: 10.1002/bit.25817] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 08/02/2015] [Accepted: 08/18/2015] [Indexed: 12/29/2022]
Affiliation(s)
- José T. Cortés
- Departamento de Medicina Molecular y Bioprocesos; Instituto de Biotecnología; Universidad Nacional Autónoma de México; México
| | - Noemí Flores
- Departamento de Ingeniería Celular y Biotecnología; Instituto de Biotecnología; Universidad Nacional Autónoma de México; Av. Universidad 2001, Col. Chamilpa CP 62210 Cuernavaca Morelos México
| | - Francisco Bolívar
- Departamento de Ingeniería Celular y Biotecnología; Instituto de Biotecnología; Universidad Nacional Autónoma de México; Av. Universidad 2001, Col. Chamilpa CP 62210 Cuernavaca Morelos México
| | - Alvaro R. Lara
- Departamento de Procesos y Tecnología; Universidad Autónoma Metropolitana-Cuajimalpa; Av. Vasco de Quiroga 4871, Col. Santa Fe, Del. Cuajimalpa, México, D.F. CP 05348 México
| | - Octavio T. Ramírez
- Departamento de Medicina Molecular y Bioprocesos; Instituto de Biotecnología; Universidad Nacional Autónoma de México; México
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16
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A novel milliliter-scale chemostat system for parallel cultivation of microorganisms in stirred-tank bioreactors. J Biotechnol 2015; 210:19-24. [DOI: 10.1016/j.jbiotec.2015.06.402] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 06/10/2015] [Accepted: 06/16/2015] [Indexed: 11/23/2022]
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17
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Gonçalves GAL, Prather KLJ, Monteiro GA, Carnes AE, Prazeres DMF. Plasmid DNA production with Escherichia coli GALG20, a pgi-gene knockout strain: fermentation strategies and impact on downstream processing. J Biotechnol 2014; 186:119-27. [PMID: 24995846 DOI: 10.1016/j.jbiotec.2014.06.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 06/04/2014] [Accepted: 06/04/2014] [Indexed: 10/25/2022]
Abstract
The market development of plasmid biopharmaceuticals for gene therapy and DNA vaccination applications is critically dependent on the availability of cost-effective manufacturing processes capable of delivering large amounts of high-quality plasmid DNA (pDNA) for clinical trials and commercialization. The producer host strain used in these processes must be designed to meet the upstream and downstream processing challenges characteristic of large scale pDNA production. The goal of the present study was to investigate the effect of different glucose feeding strategies (batch and fed-batch) on the pDNA productivity of GALG20, a pgi Escherichia coli strain potentially useful in industrial fermentations, which uses the pentose phosphate pathway (PPP) as the main route for glucose metabolism. The parental strain, MG1655ΔendAΔrecA, and the common laboratory strain, DH5α, were used for comparison purposes and pVAX1GFP, a ColE1-type plasmid, was tested as a model. GALG20 produced 3-fold more pDNA (∼141 mg/L) than MG1655ΔendAΔrecA (∼48 mg/L) and DH5α (∼40 mg/L) in glucose-based fed-batch fermentations. The amount of pDNA in lysates obtained from these cells was also larger for GALG20 (41%) when compared with MG1655ΔendAΔrecA (31%) and DH5α (26%). However, the final quality of pDNA preparations obtained with a process that explores precipitation, hydrophobic interaction chromatography and size exclusion was not significantly affected by strain genotype. Finally, high cell density fed-batch cultures were performed with GALG20, this time using another ColE1-type plasmid, NTC7482-41H-HA, in pre-industrial facilities using glucose and glycerol. These experiments demonstrated the ability of GALG20 to produce high pDNA yields of the order of 2100-2200 mg/L.
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Affiliation(s)
- Geisa A L Gonçalves
- MIT-Portugal Program, Portugal; IBB - Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Kristala L J Prather
- MIT-Portugal Program, Portugal; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Gabriel A Monteiro
- MIT-Portugal Program, Portugal; IBB - Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Aaron E Carnes
- Nature Technology Corporation, Lincoln, NE, United States
| | - Duarte M F Prazeres
- MIT-Portugal Program, Portugal; IBB - Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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18
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Pablos TE, Sigala JC, Le Borgne S, Lara AR. Aerobic expression ofVitreoscillahemoglobin efficiently reduces overflow metabolism inEscherichia coli. Biotechnol J 2014; 9:791-9. [DOI: 10.1002/biot.201300388] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 01/25/2014] [Accepted: 02/17/2014] [Indexed: 12/17/2022]
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