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Han Q, Eiteman MA. Acetate formation during recombinant protein production in Escherichia coli K-12 with an elevated NAD(H) pool. Eng Life Sci 2019; 19:770-780. [PMID: 32624970 DOI: 10.1002/elsc.201900045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 08/15/2019] [Accepted: 08/21/2019] [Indexed: 12/14/2022] Open
Abstract
Acetate formation is a disadvantage in the use of Escherichia coli for recombinant protein production, and many studies have focused on optimizing fermentation processes or altering metabolism to eliminate acetate accumulation. In this study, E. coli MEC697 (MG1655 nadR nudC mazG) maintained a larger pool of NAD(H) compared to the wild-type control, and also accumulated lower concentrations of acetate when grown in batch culture on glucose. In steady-state cultures, the elevated total NAD(H) found in MEC697 delayed the threshold dilution rate for acetate formation to a growth rate of 0.27 h-1. Batch and fed-batch processes using MEC697 were examined for the production of β-galactosidase as a model recombinant protein. Fed-batch culture of MEC697/pTrc99A-lacZ compared to MG1655/pTrc99A-lacZ at a growth rate of 0.22 h-1 showed only a modest increase of protein formation. However, 1 L batch growth of MEC697/pTrc99A-lacZ resulted in 50% lower acetate formation compared to MG1655/pTrc99A-lacZ and a two-fold increase in recombinant protein production.
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Affiliation(s)
- Qi Han
- School of Chemical Materials and Biomedical Engineering University of Georgia Athens GA USA
| | - Mark A Eiteman
- School of Chemical Materials and Biomedical Engineering University of Georgia Athens GA USA
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2
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Draghi WO, Del Papa MF, Hellweg C, Watt SA, Watt TF, Barsch A, Lozano MJ, Lagares A, Salas ME, López JL, Albicoro FJ, Nilsson JF, Torres Tejerizo GA, Luna MF, Pistorio M, Boiardi JL, Pühler A, Weidner S, Niehaus K, Lagares A. A consolidated analysis of the physiologic and molecular responses induced under acid stress in the legume-symbiont model-soil bacterium Sinorhizobium meliloti. Sci Rep 2016; 6:29278. [PMID: 27404346 PMCID: PMC4941405 DOI: 10.1038/srep29278] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 06/14/2016] [Indexed: 01/30/2023] Open
Abstract
Abiotic stresses in general and extracellular acidity in particular disturb and limit nitrogen-fixing symbioses between rhizobia and their host legumes. Except for valuable molecular-biological studies on different rhizobia, no consolidated models have been formulated to describe the central physiologic changes that occur in acid-stressed bacteria. We present here an integrated analysis entailing the main cultural, metabolic, and molecular responses of the model bacterium Sinorhizobium meliloti growing under controlled acid stress in a chemostat. A stepwise extracellular acidification of the culture medium had indicated that S. meliloti stopped growing at ca. pH 6.0–6.1. Under such stress the rhizobia increased the O2 consumption per cell by more than 5-fold. This phenotype, together with an increase in the transcripts for several membrane cytochromes, entails a higher aerobic-respiration rate in the acid-stressed rhizobia. Multivariate analysis of global metabolome data served to unequivocally correlate specific-metabolite profiles with the extracellular pH, showing that at low pH the pentose-phosphate pathway exhibited increases in several transcripts, enzymes, and metabolites. Further analyses should be focused on the time course of the observed changes, its associated intracellular signaling, and on the comparison with the changes that operate during the sub lethal acid-adaptive response (ATR) in rhizobia.
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Affiliation(s)
- W O Draghi
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - M F Del Papa
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - C Hellweg
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - S A Watt
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - T F Watt
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - A Barsch
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - M J Lozano
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - A Lagares
- Laboratorio de Bioquímica, Microbiología e Interacciones Biológicas en el Suelo, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, Bernal B1876BXD, Buenos Aires, Argentina
| | - M E Salas
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - J L López
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - F J Albicoro
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - J F Nilsson
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - G A Torres Tejerizo
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - M F Luna
- CINDEFI - Centro de Investigación y Desarrollo en Fermentaciones Industriales, CONICET - Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - M Pistorio
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - J L Boiardi
- CINDEFI - Centro de Investigación y Desarrollo en Fermentaciones Industriales, CONICET - Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
| | - A Pühler
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - S Weidner
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - K Niehaus
- CeBiTec - Centrum für Biotechnologie, Universität Bielefeld, Bielefeld, Germany
| | - A Lagares
- IBBM - Instituto de Biotecnología y Biología Molecular, CONICET - Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, calles 47 y 115, 1900-La Plata, Argentina
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Abstract
For a generation of microbiologists who study pathogenesis in the context of the human microbiome, understanding the diversity of bacterial metabolism is essential. In this chapter, I briefly describe how and why I became, and remain, interested in metabolism. I then will describe and compare some of the strategies used by bacteria to consume sugars as one example of metabolic diversity. I will end with a plea to embrace metabolism in the endeavor to understand pathogenesis.
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Affiliation(s)
- Alan J Wolfe
- Department of Microbiology and Immunology, Stritch School of Medicine, Health Sciences Division, Loyola University Chicago, Maywood, Illinois
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Gong M, Tang C, Zhu C. Cloning and expression of delta-1-pyrroline-5-carboxylate dehydrogenase in Escherichia coli DH5α improves phosphate solubilization. Can J Microbiol 2014; 60:761-5. [DOI: 10.1139/cjm-2014-0412] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A primary cDNA library of Penicillium oxalicum I1 was constructed using the switching mechanism at the 5′ end of the RNA transcript (SMART) technique. A total of 106 clones showed halos in tricalcium phosphate (TCP) medium, and clone I-40 showed clear halos. The full-length cDNA of clone I-40 was 1355 bp with a complete open reading frame (ORF) of 1032 bp, encoding a protein of 343 amino acids. Multiple alignment analysis revealed a high degree of homology between the ORF of clone I-40 and delta-1-pyrroline-5-carboxylate dehydrogenase (P5CDH) of other fungi. The ORF expression vector was constructed and transformed into Escherichia coli DH5α. The transformant (ORF-1) with the P5CDH gene secreted organic acid in medium with TCP as the sole source of phosphate. Acetic acid and α-ketoglutarate were secreted in 4 and 24 h, respectively. ORF-1 decreased the pH of the medium from 6.62 to 3.45 and released soluble phosphate at 0.172 mg·mL−1 in 28 h. Expression of the P. oxalicum I1 p5cdh gene in E. coli could enhance organic acid secretion and phosphate-solubilizing ability.
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Affiliation(s)
- Mingbo Gong
- Key Laboratory of Microbial Resources, Ministry of Agriculture / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, People’s Republic of China
| | - Chaoxi Tang
- Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, People’s Republic of China
| | - Changxiong Zhu
- Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, People’s Republic of China
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Co-Expression of Threonine Dehydratase and Acetolactate Synthase in Escherichia Coli for L-Isoleucine Production. ACTA ACUST UNITED AC 2014. [DOI: 10.4028/www.scientific.net/amr.989-994.997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metabolic engineering ofCorynebacterium glutamicumhas sought to divert carbon into L-isoleucine. However, the fermentation period of this strain is long. TheC.glutamicumYILW strain (LeuL, AHVr, SGr, Leu-MEr) was previously derived by repeated compound mutagenesis which could accumulate 20.2 g/L L-isoleucine in a 5-L jar fermentor. Overexpression of the threonine dehydratase gene (ilvA) fromCorynebacterium glutamicumYILW and coexpression of threonine dehydratase and acetolactate synthase (ilvBN) from it were employed to divert carbon flux toward L-isoleucine. The strainE. coliTRFC with the expression ofilvA could accumulate L-isoleucine of 6.8 g/L without accumulation of any L-threonine by fed-batch fermentation in a 5-L jar fermentor. However, the production of L-isoleucine by the strainE.coliTRFC with the co-expression ofilvA andilvBN was decreased by 19.1%, and the production of L-valine was increased by 40% compared with that ofE. coliTRFC with the expression ofilvA.
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Fan C, Li Z, Ye Q. Two-Stage Cultivation of Pseudomonas sp. F12 for the Production of Enzymes Converting dl-2-Amino-Δ2-thiazoline-4-carboxylic Acid to l-Cysteine. Appl Biochem Biotechnol 2012; 168:1867-79. [DOI: 10.1007/s12010-012-9903-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2012] [Accepted: 09/18/2012] [Indexed: 11/29/2022]
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Dittrich CR, Bennett GN, San KY. Characterization of the Acetate-Producing Pathways in Escherichia coli. Biotechnol Prog 2008; 21:1062-7. [PMID: 16080684 DOI: 10.1021/bp050073s] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Although the bacterium E. coli is chosen as the host in many bioprocesses, the accumulation of a common byproduct, acetate, is often problematic. Acetate, when present at high levels, will inhibit both cell growth and recombinant protein productivity. In addition, products derived from the central aerobic metabolic pathway often compete with the acetate-producing pathways poxB and ackA-pta for glucose as the substrate. As such, a significant portion of the glucose may be excreted as acetate, wasting substrate that otherwise could have been used for the desired product. We have created mutant E. coli strains with a deletion of either the poxB or the ackA-pta pathway. These two strains, along with the wild-type strain, have been studied in batch reactors over a 12 h time period, at pH 7.0 and 6.0. The wild-type strain has also been studied using glucose as the carbon source. Data were collected to correlate cellular growth, extracellular metabolite production, enzyme activity, and gene expression. Results show that the ackA-pta pathway dominates in exponential phase, and the poxB pathway dominates in stationary phase. The ackA-pta pathway is repressed in acidic environments, whereas the poxB pathway is activated.
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Affiliation(s)
- Cheryl R Dittrich
- Departments of Bioengineering, Biochemistry and Cell Biology, Rice University, Houston, TX, USA
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8
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Lin H, Bennett GN, San KY. Chemostat culture characterization of Escherichia coli mutant strains metabolically engineered for aerobic succinate production: A study of the modified metabolic network based on metabolite profile, enzyme activity, and gene expression profile. Metab Eng 2005; 7:337-52. [PMID: 16099188 DOI: 10.1016/j.ymben.2005.06.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2005] [Revised: 06/02/2005] [Accepted: 06/13/2005] [Indexed: 11/24/2022]
Abstract
Various Escherichia coli mutant strains designed for succinate production under aerobic conditions were characterized in chemostat. The metabolite profiles, enzyme activities, and gene expression profiles were studied to better understand the metabolic network operating in these mutant strains. The most efficient succinate producing mutant strain HL27659k was able to achieve a succinate yield of 0.91 mol/mol glucose at a dilution rate of 0.1/h. This strain has the five following mutations: sdhAB, (ackA-pta), poxB, iclR, and ptsG. Four other strains involved in this study were HL2765k, HL276k, HL2761k, and HL51276k. Strain HL2765k has mutations in sdhAB, (ackA-pta), poxB and iclR, strain HL276k has mutations in sdhAB, (ackA-pta) and poxB, strain HL2761k has mutations in sdhAB, (ackA-pta), poxB and icd, and strain HL51276k has mutations in iclR, icd, sdhAB, (ackA-pta) and poxB. Enzyme activity data showed strain HL27659k has substantially higher citrate synthase and malate dehydrogenase activities than the other four strains. The data also showed that only iclR mutation strains exhibited isocitrate lyase and malate synthase activities. Gene expression profiles also complemented the studies of enzyme activity and metabolites from chemostat cultures. The results showed that the succinate synthesis pathways engineered in strain HL27659k were highly efficient, yielding succinate as the only major product produced under aerobic conditions. Strain HL27659k was the only strain without pyruvate accumulation, and its acetate production was the least among all the mutant strains examined.
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Affiliation(s)
- Henry Lin
- Department of Bioengineering, Rice University, Houston, Texas, USA
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Lin H, Bennett GN, San KY. Fed-batch culture of a metabolically engineered Escherichia coli strain designed for high-level succinate production and yield under aerobic conditions. Biotechnol Bioeng 2005; 90:775-9. [PMID: 15803467 DOI: 10.1002/bit.20458] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
An aerobic succinate production system developed by Lin et al. (Metab Eng, in press) is capable of achieving the maximum theoretical succinate yield of 1.0 mol/mol glucose for aerobic conditions. It also exhibits high succinate productivity. This succinate production system is a mutant E. coli strain with five pathways inactivated: DeltasdhAB, Delta(ackA-pta), DeltapoxB, DeltaiclR, and DeltaptsG. The mutant strain also overexpresses Sorghum vulgare pepc. This mutant strain is designated HL27659k(pKK313). Fed-batch reactor experiments were performed for the strain HL27659k(pKK313) under aerobic conditions to determine and demonstrate its capacity for high-level succinate production. Results showed that it could produce 58.3 g/l of succinate in 59 h under complete aerobic conditions. Throughout the entire fermentation the average succinate yield was 0.94+/-0.07 mol/mol glucose, the average productivity was 1.08+/-0.06 g/l-h, and the average specific productivity was 89.77+/-3.40 mg/g-h. Strain HL27659k (pKK313) is, thus, capable of large-scale succinate production under aerobic conditions. The results also showed that the aerobic succinate production system using the designed strain HL27659k(pKK313) is more practical than conventional anaerobic succinate production systems. It has remarkable potential for industrial-scale succinate production and process optimization.
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Affiliation(s)
- Henry Lin
- Department of Bioengineering, Rice University, MS 142, P.O. Box 1892, Houston, Texas 77251-1892, USA
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Lin H, Bennett GN, San KY. Metabolic engineering of aerobic succinate production systems in Escherichia coli to improve process productivity and achieve the maximum theoretical succinate yield. Metab Eng 2005; 7:116-27. [PMID: 15781420 DOI: 10.1016/j.ymben.2004.10.003] [Citation(s) in RCA: 136] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2004] [Accepted: 10/29/2004] [Indexed: 10/26/2022]
Abstract
The potential to produce succinate aerobically in Escherichia coli would offer great advantages over anaerobic fermentation in terms of faster biomass generation, carbon throughput, and product formation. Genetic manipulations were performed on two aerobic succinate production systems to increase their succinate yield and productivity. One of the aerobic succinate production systems developed earlier (Biotechnol, Bioeng., 2004, accepted) was constructed with five mutations (DeltasdhAB, Deltaicd, DeltaiclR, DeltapoxB, and Delta(ackA-pta)), which created a highly active glyoxylate cycle. In this study, a second production system was constructed with four of the five above mutations (DeltasdhAB, DeltaiclR, DeltapoxB, and Delta(ackA-pta)). This system has two routes in the aerobic central metabolism for succinate production. One is the glyoxylate cycle and the other is the oxidative branch of the TCA cycle. Inactivation of ptsG and overexpression of a mutant Sorghum pepc in these two production systems showed that the maximum theoretical succinate yield of 1.0 mol/mol glucose consumed could be achieved. Furthermore, the two-route production system with ptsG inactivation and pepc overexpression demonstrated substantially higher succinate productivity than the previous system, a level unsurpassed for aerobic succinate production. This optimized system showed remarkable potential for large-scale aerobic succinate production and process optimization.
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Affiliation(s)
- Henry Lin
- Department of Bioengineering, 6100 Main Street, Rice University, Houston, TX 77005-1892, USA
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van de Walle M, Shiloach J. Proposed mechanism of acetate accumulation in two recombinant Escherichia coli strains during high density fermentation. Biotechnol Bioeng 1998; 57:71-8. [PMID: 10099180 DOI: 10.1002/(sici)1097-0290(19980105)57:1<71::aid-bit9>3.0.co;2-s] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The productivity of Escherichia coli as a producer of recombinant proteins is affected by its metabolic properties, especially by acetate production. Two commercially used E. coli strains, BL21 (lambdaDE3) and JM109, differ significantly in their acetate production during batch fermentation at high initial glucose concentrations. E. coli BL21 grows to an optical density (OD, 600 nm) of 100 and produces no more than 2 g/L acetate, while E. coli JM109 grows to an OD (600 nm) of 80 and produces up to 14 g/L acetate. Even in fed-batch fermentation, when glucose concentration is maintained between 0.5 and 1.0 g/L, JM109 accumulates 4 times more acetate than BL21. To investigate the difference between the two strains, metabolites and enzymes involved in carbon utilization and acetate production were analyzed (isocitrate, ATP, phosphoenolpyruvate, pyruvate, isocitrate lyase, and isocitrate dehydrogenase). The results showed that during batch fermentation isocitrate lyase activity and isocitrate concentration were higher in BL21 than in JM109, while pyruvate concentration was higher in JM109. The activation of the glyoxylate shunt pathway at high glucose concentrations is suggested as a possible explanation for the lower acetate accumulation in E. coli BL21. Metabolic flux analysis of the batch cultures supports the activity of the glyoxylate shunt in E. coli BL21.
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Affiliation(s)
- M van de Walle
- Biotechnology Unit-LCDB, NIDDK, National Institutes of Health, Bldg 6, Rm B1-33, Bethesda, Maryland 20892-2715, USA
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12
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Jin S, Ye K, Shimizu K. Efficient fuzzy control strategies for the application of pH-stat to fed-batch cultivation of genetically engineered Escherichia coli. JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY (OXFORD, OXFORDSHIRE : 1986) 1994; 61:273-281. [PMID: 7765585 DOI: 10.1002/jctb.280610316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In the cultivation of genetically engineered Escherichia coli it is very important to control the substrate concentration at an appropriate level in order to avoid the accumulation of acetate, thereby elevating the expression level of plasmid-encoded protein. In this paper, a pH-stat mode of fuzzy control was considered for the overexpression of beta-galactosidase in the fed-batch cultivation of recombinant E. coli. In the simple pH-stat fuzzy control, the response of pH change in the culture broth to the feeding rate of glucose was used to estimate the glucose consumption rate. In the modified pH-stat fuzzy control, the glucose consumption rate was accurately estimated by using pH change and the change in the carbon dioxide content of the exhaust gas. With this control strategy, the cell density could be increased to 72 g DCW dm-3, which was twofold higher than that attained in the cultivation with the simple pH-stat fuzzy control. The bulk beta-galactosidase concentration was increased to 4150 U cm-3, which was threefold higher than when the simple pH-stat control was used.
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Affiliation(s)
- S Jin
- Department of Biochemical Engineering and Science, Kyushu Institute of Technology, Fukuoka, Japan
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13
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Ye K, Jin S, Shimizu K. Fuzzy neural network for the control of high cell density cultivation of recombinant Escherichia coli. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0922-338x(94)90151-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Ko YF, Bentley WE, Weigand WA. An integrated metabolic modeling approach to describe the energy efficiency ofEscherichia coli fermentations under oxygen-limited conditions: Cellular energetics, carbon flux, and acetate production. Biotechnol Bioeng 1993; 42:843-53. [DOI: 10.1002/bit.260420709] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Yee L, Blanch HW. Recombinant trypsin production in high cell density fed-batch cultures inEscherichia coli. Biotechnol Bioeng 1993; 41:781-90. [DOI: 10.1002/bit.260410804] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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16
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Yee L, Blanch HW. Recombinant protein expression in high cell density fed-batch cultures of Escherichia coli. Nat Biotechnol 1993; 10:1550-6. [PMID: 1369204 DOI: 10.1038/nbt1292-1550] [Citation(s) in RCA: 116] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Whereas cell concentrations of 5-10 grams dry cell weight per liter (gDCW/l) are typical of batch cultures, fed-batch techniques can be used to achieve concentrations greater than 50 gDCW/l. Feeding strategies for fed-batch cultures include feed-back control as well as pre-determined feeding profiles. The volumetric yield of recombinant products can be improved by controlling the specific growth rate and the substrate concentration. Furthermore, inhibitory by-product formation can be minimized in fed-batch cultures. This review focuses on the use of fed-batch techniques to produce recombinant products in Escherichia coli. The modes of nutrient feeding that have been employed are discussed, and the factors important in attaining high cell concentrations as well as high specific yields of recombinant product are described.
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Affiliation(s)
- L Yee
- Department of Chemical Engineering, University of California, Berkeley 94702
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17
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