Article (Scientific journals)
The Lazarus Escherichia coli Effect: Recovery of Productivity on Glycerol/Lactose Mixed Feed in Continuous Biomanufacturing.
Kittler, Stefan; Kopp, Julian; Veelenturf, Patrick Gwen et al.
2020In Frontiers in Bioengineering and Biotechnology, 8, p. 993
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Keywords :
E. coli; continuous biomanufacturing; mixed-feeding; productivity recovery; recombinant protein production
Abstract :
[en] Continuous cultivation with Escherichia coli has several benefits compared to classical fed-batch cultivation. The economic benefits would be a stable process, which leads to time independent quality of the product, and hence ease the downstream process. However, continuous biomanufacturing with E. coli is known to exhibit a drop of productivity after about 4-5 days of cultivation depending on dilution rate. These cultivations are generally performed on glucose, being the favorite carbon source for E. coli and used in combination with isopropyl β-D-1 thiogalactopyranoside (IPTG) for induction. In recent works, harsh induction with IPTG was changed to softer induction using lactose for T7-based plasmids, with the result of reducing the metabolic stress and tunability of productivity. These mixed feed systems based on glucose and lactose result in high amounts of correctly folded protein. In this study we used different mixed feed systems with glucose/lactose and glycerol/lactose to investigate productivity of E. coli based chemostats. We tested different strains producing three model proteins, with the final aim of a stable long-time protein expression. While glucose fed chemostats showed the well-known drop in productivity after a certain process time, glycerol fed cultivations recovered productivity after about 150 h of induction, which corresponds to around 30 generation times. We want to further highlight that the cellular response upon galactose utilization in E. coli BL21(DE3), might be causing fluctuating productivity, as galactose is referred to be a weak inducer. This "Lazarus" phenomenon has not been described in literature before and may enable a stabilization of continuous cultivation with E. coli using different carbon sources.
Disciplines :
Biotechnology
Author, co-author :
Kittler, Stefan;  Research Division Biochemical Engineering, Research Group Integrated Bioprocess
Kopp, Julian;  Christian Doppler Laboratory for Mechanistic and Physiological Methods for
Veelenturf, Patrick Gwen;  Christian Doppler Laboratory for Mechanistic and Physiological Methods for
Spadiut, Oliver;  Research Division Biochemical Engineering, Research Group Integrated Bioprocess
Delvigne, Frank  ;  Université de Liège - ULiège > Département GxABT > Microbial technologies ; TERRA Teaching and Research Centre, Microbial Processes and Interactions (MiPI),
Herwig, Christoph;  Research Division Biochemical Engineering, Research Group Integrated Bioprocess  ; Christian Doppler Laboratory for Mechanistic and Physiological Methods for
Slouka, Christoph;  Research Division Biochemical Engineering, Research Group Integrated Bioprocess
Language :
English
Title :
The Lazarus Escherichia coli Effect: Recovery of Productivity on Glycerol/Lactose Mixed Feed in Continuous Biomanufacturing.
Publication date :
2020
Journal title :
Frontiers in Bioengineering and Biotechnology
eISSN :
2296-4185
Publisher :
Frontiers Research Foundation, Ch
Volume :
8
Pages :
993
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright © 2020 Kittler, Kopp, Veelenturf, Spadiut, Delvigne, Herwig and Slouka.
Available on ORBi :
since 17 October 2022

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