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Borčinová M, Raschmanová H, Zamora I, Looser V, Marešová H, Hirsch S, Kyslík P, Kovar K. Production and secretion dynamics of prokaryotic Penicillin G acylase in Pichia pastoris. Appl Microbiol Biotechnol 2020; 104:5787-5800. [PMID: 32424437 PMCID: PMC7306039 DOI: 10.1007/s00253-020-10669-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/29/2020] [Accepted: 05/04/2020] [Indexed: 12/13/2022]
Abstract
To take full advantage of recombinant Pichia pastoris (Komagataella phaffii) as a production system for heterologous proteins, the complex protein secretory process should be understood and optimised by circumventing bottlenecks. Typically, little or no attention has been paid to the fate of newly synthesised protein inside the cell, or its passage through the secretory pathway, and only the secreted product is measured. However, the system’s productivity (i.e. specific production rate qp), includes productivity of secreted (qp,extra) plus intracellularly accumulated (qp,intra) protein. In bioreactor cultivations with P. pastoris producing penicillin G acylase, we studied the dynamics of product formation, i.e. both the specific product secretion (qp,extra) and product retention (qp,intra) as functions of time, as well as the kinetics, i.e. productivity in relation to specific growth rate (μ). Within the time course, we distinguished (I) an initial phase with constant productivities, where the majority of product accumulated inside the cells, and qp,extra, which depended on μ in a bell-shaped manner; (II) a transition phase, in which intracellular product accumulation reached a maximum and productivities (intracellular, extracellular, overall) were changing; (III) a new phase with constant productivities, where secretion prevailed over intracellular accumulation, qp,extra was linearly related to μ and was up to three times higher than in initial phase (I), while qp,intra decreased 4–6-fold. We show that stress caused by heterologous protein production induces cellular imbalance leading to a secretory bottleneck that ultimately reaches equilibrium. This understanding may help to develop cultivation strategies for improving protein secretion from P. pastoris.Key Points • A novel concept for industrial bioprocess development. • A Relationship between biomass growth and product formation in P. pastoris. • A Three (3) phases of protein production/secretion controlled by the AOX1-promoter. • A Proof of concept in production of industrially relevant penicillin G acylase. |
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Affiliation(s)
- Martina Borčinová
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences, Campus Grüental, CH-8820, Wädenswil, Switzerland. .,Department of Genetics and Microbiology, Faculty of Science, Charles University in Prague, Viničná 5, 12840, Prague, Czech Republic.
| | - Hana Raschmanová
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences, Campus Grüental, CH-8820, Wädenswil, Switzerland.,Department of Biotechnology, Faculty of Food and Biochemical Technology, University of Chemistry and Technology, Technická 5, 16628, Prague, Czech Republic
| | - Iwo Zamora
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences, Campus Grüental, CH-8820, Wädenswil, Switzerland.,Infors AG, Rittergasse 27, CH-4103, Bottmingen, Switzerland
| | - Verena Looser
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences, Campus Grüental, CH-8820, Wädenswil, Switzerland.,Department of Biotechnology, Faculty of Food and Biochemical Technology, University of Chemistry and Technology, Technická 5, 16628, Prague, Czech Republic
| | - Helena Marešová
- Institute of Microbiology, Czech Academy of Sciences, Videňská 1083, 14220, Prague, Czech Republic
| | - Sven Hirsch
- Institute of Applied Simulation, Zurich University of Applied Sciences, Schloss 1, CH-8820, Wädenswil, Switzerland
| | - Pavel Kyslík
- Institute of Microbiology, Czech Academy of Sciences, Videňská 1083, 14220, Prague, Czech Republic
| | - Karin Kovar
- Institute of Chemistry and Biotechnology, Zurich University of Applied Sciences, Campus Grüental, CH-8820, Wädenswil, Switzerland.,Daspool, Gerberacherweg 24, CH-8820, Wädenswil, Switzerland
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Kopp J, Slouka C, Spadiut O, Herwig C. The Rocky Road From Fed-Batch to Continuous Processing With E. coli. Front Bioeng Biotechnol 2019; 7:328. [PMID: 31824931 PMCID: PMC6880763 DOI: 10.3389/fbioe.2019.00328] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 10/28/2019] [Indexed: 12/21/2022] Open
Abstract
Escherichia coli still serves as a beloved workhorse for the production of many biopharmaceuticals as it fulfills essential criteria, such as having fast doubling times, exhibiting a low risk of contamination, and being easy to upscale. Most industrial processes in E. coli are carried out in fed-batch mode. However, recent trends show that the biotech industry is moving toward time-independent processing, trying to improve the space-time yield, and especially targeting constant quality attributes. In the 1950s, the term "chemostat" was introduced for the first time by Novick and Szilard, who followed up on the previous work performed by Monod. Chemostat processing resulted in a major hype 10 years after its official introduction. However, enthusiasm decreased as experiments suffered from genetic instabilities and physiology issues. Major improvements in strain engineering and the usage of tunable promotor systems facilitated chemostat processes. In addition, critical process parameters have been identified, and the effects they have on diverse quality attributes are understood in much more depth, thereby easing process control. By pooling the knowledge gained throughout the recent years, new applications, such as parallelization, cascade processing, and population controls, are applied nowadays. However, to control the highly heterogeneous cultivation broth to achieve stable productivity throughout long-term cultivations is still tricky. Within this review, we discuss the current state of E. coli fed-batch process understanding and its tech transfer potential within continuous processing. Furthermore, the achievements in the continuous upstream applications of E. coli and the continuous downstream processing of intracellular proteins will be discussed.
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Affiliation(s)
- Julian Kopp
- Christian Doppler Laboratory for Mechanistic and Physiological Methods for Improved Bioprocesses, Vienna, Austria
| | - Christoph Slouka
- Research Area Biochemical Engineering, Institute of Chemical Engineering, Vienna, Austria
| | - Oliver Spadiut
- Research Area Biochemical Engineering, Institute of Chemical Engineering, Vienna, Austria
| | - Christoph Herwig
- Christian Doppler Laboratory for Mechanistic and Physiological Methods for Improved Bioprocesses, Vienna, Austria
- Research Area Biochemical Engineering, Institute of Chemical Engineering, Vienna, Austria
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